From 5c10caf9c5d7ad26623a40620e9d1908d340d145 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Wed, 1 Apr 2020 19:51:30 +0200
Subject: [PATCH 01/10] updated

---
 src/1_background_information.md | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/1_background_information.md b/src/1_background_information.md
index 36d6aca..3546872 100644
--- a/src/1_background_information.md
+++ b/src/1_background_information.md
@@ -4,7 +4,7 @@
 >
 > - High level introduction to concurrency in Rust
 > - Knowing what Rust provides and not when working with async code
-> - Understanding why we need runtimes 
+> - Understanding why we need a runtime-library in Rust
 > - Getting pointers to further reading on concurrency in general
 
 Before we start implementing our `Futures` , we'll go through some background
@@ -13,6 +13,18 @@ information that will help demystify some of the concepts we encounter.
 Actually, after going through these concepts, implementing futures will seem
 pretty simple. I promise.
 
+## Popular alternatives for writing concurrent programs
+
+So let's kick this off by first taking a brief look into what the popular
+options we have for writing concurrent programs
+
+### Callback based approcah
+
+You probably already know this from Javascript since it's extremely common:
+
+
+
+
 ## Futures
 
 So what is a future?

From 7f7fe098f346b9ebf5fb9659952372d3b640bfae Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Wed, 1 Apr 2020 22:56:43 +0200
Subject: [PATCH 02/10] version3 start

---
 book/1_background_information.html |   8 +-
 book/1_why_futures.html            | 629 +++++++++++++++++++++++++++++
 book/2_waker_context.html          |   2 +-
 book/3_generators_pin.html         |   2 +-
 book/4_pin.html                    |   2 +-
 book/6_future_example.html         |   2 +-
 book/8_finished_example.html       |   2 +-
 book/conclusion.html               |   2 +-
 book/index.html                    |   2 +-
 book/introduction.html             |   6 +-
 book/print.html                    | 383 +++++++++++++++++-
 book/searchindex.js                |   2 +-
 book/searchindex.json              |   2 +-
 src/1_background_information.md    |  12 -
 src/1_why_futures.md               | 400 ++++++++++++++++++
 src/SUMMARY.md                     |   1 +
 16 files changed, 1427 insertions(+), 30 deletions(-)
 create mode 100644 book/1_why_futures.html
 create mode 100644 src/1_why_futures.md

diff --git a/book/1_background_information.html b/book/1_background_information.html
index e07de5b..5ff356e 100644
--- a/book/1_background_information.html
+++ b/book/1_background_information.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html" class="active"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html" class="active"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -155,7 +155,7 @@
 <ul>
 <li>High level introduction to concurrency in Rust</li>
 <li>Knowing what Rust provides and not when working with async code</li>
-<li>Understanding why we need runtimes </li>
+<li>Understanding why we need a runtime-library in Rust</li>
 <li>Getting pointers to further reading on concurrency in general</li>
 </ul>
 </blockquote>
@@ -279,7 +279,7 @@ it needs to be, so go on and read these chapters if you feel a bit unsure. </p>
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
                         
-                            <a rel="prev" href="introduction.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="1_why_futures.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
                             </a>
                         
@@ -297,7 +297,7 @@ it needs to be, so go on and read these chapters if you feel a bit unsure. </p>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
                 
-                    <a href="introduction.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a href="1_why_futures.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                         <i class="fa fa-angle-left"></i>
                     </a>
                 
diff --git a/book/1_why_futures.html b/book/1_why_futures.html
new file mode 100644
index 0000000..3441825
--- /dev/null
+++ b/book/1_why_futures.html
@@ -0,0 +1,629 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Why Futures - Futures Explained in 200 Lines of Rust</title>
+        
+
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="This book aims to explain Futures in Rust using an example driven approach.">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        <link rel="shortcut icon" href="favicon.png">
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+    <body class="light">
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+                sidebar = sidebar || 'visible';
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+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html" class="active"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+            </div>
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+                        <h1 class="menu-title">Futures Explained in 200 Lines of Rust</h1>
+
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+                            <a href="print.html" title="Print this book" aria-label="Print this book">
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+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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+
+                <div id="content" class="content">
+                    <main>
+                        <h1><a class="header" href="#why-futures" id="why-futures">Why Futures</a></h1>
+<p>Before we go into the details about Futures in Rust, let's take a quick look
+at the alternatives for handling concurrent programming in general and some
+pros and cons for each of them.</p>
+<h2><a class="header" href="#threads-provided-by-the-operating-system" id="threads-provided-by-the-operating-system">Threads provided by the operating system</a></h2>
+<p>Now one way of accomplishing this is letting the OS take care of everything for 
+us. We do this by simply spawning a new OS thread for each task we want to
+accomplish and write code like we normally would.</p>
+<p><strong>Pros:</strong></p>
+<ul>
+<li>Simple</li>
+<li>Easy to use</li>
+<li>Switching between tasks is reasonably fast</li>
+<li>You get parallelism for free</li>
+</ul>
+<p><strong>Cons:</strong></p>
+<ul>
+<li>OS level threads come with a rather large stack. If you have many tasks
+waiting simultaneously (like you would in a web-server under heavy load) you'll
+run out of memory pretty soon.</li>
+<li>There are a lot of syscalls involved. This can be pretty costly when the number
+of tasks is high.</li>
+<li>The OS has many things it needs to handle. It might not switch back to your
+thread as fast as you'd wish.</li>
+<li>Might not be an option on some systems</li>
+</ul>
+<p>Using OS threads in Rust looks like this:</p>
+<pre><pre class="playpen"><code class="language-rust">use std::thread;
+
+fn main() {
+    println!(&quot;So we start the program here!&quot;);
+    let t1 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(200));
+        println!(&quot;We create tasks which gets run when they're finished!&quot;);
+    });
+
+    let t2 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(100));
+        println!(&quot;We can even chain callbacks...&quot;);
+        let t3 = thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(50));
+            println!(&quot;...like this!&quot;);
+        });
+        t3.join().unwrap();
+    });
+    println!(&quot;While our tasks are executing we can do other stuff here.&quot;);
+
+    t1.join().unwrap();
+    t2.join().unwrap();
+}
+</code></pre></pre>
+<h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
+<p>Green threads has been popularized by GO in the recent years. Green threads
+uses the same basic technique as operating systems does to handle concurrency.</p>
+<p>Green threads are implemented by setting up a stack for each task you want to
+execute and make the CPU &quot;jump&quot; from one stack to another to switch between
+tasks.</p>
+<p>The typical flow will be like this:</p>
+<ol>
+<li>Run som non-blocking code</li>
+<li>Make a blocking call to some external resource</li>
+<li>CPU jumps to the &quot;main&quot; thread which schedules a different thread to run and
+&quot;jumps&quot; to that stack</li>
+<li>Run some non-blocking code on the new thread until a new blocking call or the
+task is finished</li>
+<li>&quot;jumps&quot; back to the &quot;main&quot; thread and so on</li>
+</ol>
+<p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
+second as you read this.</p>
+<p>The main advantages are:</p>
+<ol>
+<li>Simple to use. The code will look like it does when using OS threads.</li>
+<li>A &quot;context switch&quot; is reasonably fast</li>
+<li>Each stack only gets a little memory to start with so you can have hundred of
+thousands of green threads running.</li>
+<li>It's easy to incorporate <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking"><em>preemtion</em></a>
+which puts a lot of control in the hands of the runtime implementors.</li>
+</ol>
+<p>The main cons are:</p>
+<ol>
+<li>The stacks might need to grow. Solving this is not easy and will have a cost.</li>
+<li>You need to save all the CPU state on every switch</li>
+<li>It's not a <em>zero cost abstraction</em> (which is one of the reasons Rust removed
+them early on).</li>
+<li>Complicated to implement correctly if you want to support many different
+platforms.</li>
+</ol>
+<p>If you were to implement green threads in Rust, it could look something like
+this:</p>
+<pre><code>The example presented below is from an earlier book I wrote about green
+threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
+If you want to know what's going on everything is explained in detail
+in that book.
+</code></pre>
+<pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
+#![feature(naked_functions)]
+use std::ptr;
+
+const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;
+const MAX_THREADS: usize = 4;
+static mut RUNTIME: usize = 0;
+
+pub struct Runtime {
+    threads: Vec&lt;Thread&gt;,
+    current: usize,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+enum State {
+    Available,
+    Running,
+    Ready,
+}
+
+struct Thread {
+    id: usize,
+    stack: Vec&lt;u8&gt;,
+    ctx: ThreadContext,
+    state: State,
+}
+
+#[derive(Debug, Default)]
+#[repr(C)]
+struct ThreadContext {
+    rsp: u64,
+    r15: u64,
+    r14: u64,
+    r13: u64,
+    r12: u64,
+    rbx: u64,
+    rbp: u64,
+}
+
+impl Thread {
+    fn new(id: usize) -&gt; Self {
+        Thread {
+            id,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Available,
+        }
+    }
+}
+
+impl Runtime {
+    pub fn new() -&gt; Self {
+        let base_thread = Thread {
+            id: 0,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Running,
+        };
+
+        let mut threads = vec![base_thread];
+        let mut available_threads: Vec&lt;Thread&gt; = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
+        threads.append(&amp;mut available_threads);
+        Runtime {
+            threads,
+            current: 0,
+        }
+    }
+
+    pub fn init(&amp;self) {
+        unsafe {
+            let r_ptr: *const Runtime = self;
+            RUNTIME = r_ptr as usize;
+        }
+    }
+
+    pub fn run(&amp;mut self) -&gt; ! {
+        while self.t_yield() {}
+        std::process::exit(0);
+    }
+
+    fn t_return(&amp;mut self) {
+        if self.current != 0 {
+            self.threads[self.current].state = State::Available;
+            self.t_yield();
+        }
+    }
+
+    fn t_yield(&amp;mut self) -&gt; bool {
+        let mut pos = self.current;
+        while self.threads[pos].state != State::Ready {
+            pos += 1;
+            if pos == self.threads.len() {
+                pos = 0;
+            }
+            if pos == self.current {
+                return false;
+            }
+        }
+        if self.threads[self.current].state != State::Available {
+            self.threads[self.current].state = State::Ready;
+        }
+        self.threads[pos].state = State::Running;
+        let old_pos = self.current;
+        self.current = pos;
+        unsafe {
+            switch(&amp;mut self.threads[old_pos].ctx, &amp;self.threads[pos].ctx);
+        }
+        self.threads.len() &gt; 0
+    }
+
+    pub fn spawn(&amp;mut self, f: fn()) {
+        let available = self
+            .threads
+            .iter_mut()
+            .find(|t| t.state == State::Available)
+            .expect(&quot;no available thread.&quot;);
+        let size = available.stack.len();
+        unsafe {
+            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
+            let s_ptr = (s_ptr as usize &amp; !15) as *mut u8;
+            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
+            available.ctx.rsp = s_ptr.offset(-32) as u64;
+        }
+        available.state = State::Ready;
+    }
+}
+
+fn guard() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_return();
+    };
+}
+
+pub fn yield_thread() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_yield();
+    };
+}
+
+#[naked]
+#[inline(never)]
+unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
+    asm!(&quot;
+        mov     %rsp, 0x00($0)
+        mov     %r15, 0x08($0)
+        mov     %r14, 0x10($0)
+        mov     %r13, 0x18($0)
+        mov     %r12, 0x20($0)
+        mov     %rbx, 0x28($0)
+        mov     %rbp, 0x30($0)
+   
+        mov     0x00($1), %rsp
+        mov     0x08($1), %r15
+        mov     0x10($1), %r14
+        mov     0x18($1), %r13
+        mov     0x20($1), %r12
+        mov     0x28($1), %rbx
+        mov     0x30($1), %rbp
+        ret
+        &quot;
+    :
+    :&quot;r&quot;(old), &quot;r&quot;(new)
+    :
+    : &quot;volatile&quot;, &quot;alignstack&quot;
+    );
+}
+
+fn main() {
+    let mut runtime = Runtime::new();
+    runtime.init();
+    runtime.spawn(|| {
+        println!(&quot;THREAD 1 STARTING&quot;);
+        let id = 1;
+        for i in 0..10 {
+            println!(&quot;thread: {} counter: {}&quot;, id, i);
+            yield_thread();
+        }
+        println!(&quot;THREAD 1 FINISHED&quot;);
+    });
+    runtime.spawn(|| {
+        println!(&quot;THREAD 2 STARTING&quot;);
+        let id = 2;
+        for i in 0..15 {
+            println!(&quot;thread: {} counter: {}&quot;, id, i);
+            yield_thread();
+        }
+        println!(&quot;THREAD 2 FINISHED&quot;);
+    });
+    runtime.run();
+}
+</code></pre></pre>
+<h3><a class="header" href="#callback-based-approach" id="callback-based-approach">Callback based approach</a></h3>
+<p>You probably already know this from Javascript since it's extremely common.
+The whole idea behind a callback based approach is to save a pointer to a
+set of instructions we want to run later on.</p>
+<p>The basic idea of not involving threads as a primary way to achieve concurrency
+is the common denominator for the rest of the approaches. Including the one
+Rust uses today which we'll soon get to.</p>
+<p><strong>Advantages:</strong></p>
+<ul>
+<li>Easy to implement in most languages</li>
+<li>No context switching</li>
+<li>Low memory overhead (in most cases)</li>
+</ul>
+<p><strong>Drawbacks:</strong></p>
+<ul>
+<li>Each task must save the state it needs for later, the memory usage will grow
+linearly with the number of tasks i .</li>
+<li>Can be hard to reason about, also known as &quot;callback hell&quot;.</li>
+<li>Sharing state between tasks is a hard problem in Rust using this approach due
+to it's ownership model.</li>
+</ul>
+<p>The</p>
+<p>If we did that in Rust it could look something like this:</p>
+<pre><pre class="playpen"><code class="language-rust">fn program_main() {
+    println!(&quot;So we start the program here!&quot;);
+    set_timeout(200, || {
+        println!(&quot;We create tasks which gets run when they're finished!&quot;);
+    });
+    set_timeout(100, || {
+        println!(&quot;We can even chain callbacks...&quot;);
+        set_timeout(50, || {
+            println!(&quot;...like this!&quot;);
+        })
+    });
+    println!(&quot;While our tasks are executing we can do other stuff here.&quot;);
+}
+
+fn main() {
+    RT.with(|rt| rt.run(program_main));
+}
+
+use std::sync::mpsc::{channel, Receiver, Sender};
+use std::{cell::RefCell, collections::HashMap, thread};
+
+thread_local! {
+    static RT: Runtime = Runtime::new();
+}
+
+struct Runtime {
+    callbacks: RefCell&lt;HashMap&lt;usize, Box&lt;dyn FnOnce() -&gt; ()&gt;&gt;&gt;,
+    next_id: RefCell&lt;usize&gt;,
+    evt_sender: Sender&lt;usize&gt;,
+    evt_reciever: Receiver&lt;usize&gt;,
+}
+
+fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) {
+    RT.with(|rt| {
+        let id = *rt.next_id.borrow();
+        *rt.next_id.borrow_mut() += 1;
+        rt.callbacks.borrow_mut().insert(id, Box::new(cb));
+        let evt_sender = rt.evt_sender.clone();
+        thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(ms));
+            evt_sender.send(id).unwrap();
+        });
+    });
+}
+
+impl Runtime {
+    fn new() -&gt; Self {
+        let (evt_sender, evt_reciever) = channel();
+        Runtime {
+            callbacks: RefCell::new(HashMap::new()),
+            next_id: RefCell::new(1),
+            evt_sender,
+            evt_reciever,
+        }
+    }
+
+    fn run(&amp;self, program: fn()) {
+        program();
+        for evt_id in &amp;self.evt_reciever {
+            let cb = self.callbacks.borrow_mut().remove(&amp;evt_id).unwrap();
+            cb();
+            if self.callbacks.borrow().is_empty() {
+                break;
+            }
+        }
+    }
+}
+</code></pre></pre>
+
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+                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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+    </body>
+</html>
diff --git a/book/2_waker_context.html b/book/2_waker_context.html
index 3aed484..e54a7ff 100644
--- a/book/2_waker_context.html
+++ b/book/2_waker_context.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html" class="active"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html" class="active"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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         </nav>
diff --git a/book/3_generators_pin.html b/book/3_generators_pin.html
index 78c3299..8fb1655 100644
--- a/book/3_generators_pin.html
+++ b/book/3_generators_pin.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html" class="active"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html" class="active"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
diff --git a/book/4_pin.html b/book/4_pin.html
index 4a1b27c..ca3c547 100644
--- a/book/4_pin.html
+++ b/book/4_pin.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html" class="active"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html" class="active"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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         </nav>
diff --git a/book/6_future_example.html b/book/6_future_example.html
index 0fdde56..1ce0fbb 100644
--- a/book/6_future_example.html
+++ b/book/6_future_example.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html" class="active"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html" class="active"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
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         </nav>
diff --git a/book/8_finished_example.html b/book/8_finished_example.html
index 9712cf1..0ffe14b 100644
--- a/book/8_finished_example.html
+++ b/book/8_finished_example.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html" class="active"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html" class="active"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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diff --git a/book/conclusion.html b/book/conclusion.html
index 5657576..77934fa 100644
--- a/book/conclusion.html
+++ b/book/conclusion.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html" class="active">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html" class="active">Conclusion and exercises</a></li></ol>
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diff --git a/book/index.html b/book/index.html
index 4d0a743..b4ba48b 100644
--- a/book/index.html
+++ b/book/index.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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diff --git a/book/introduction.html b/book/introduction.html
index 7d29c30..62ed98e 100644
--- a/book/introduction.html
+++ b/book/introduction.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html" class="active">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html" class="active">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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@@ -197,7 +197,7 @@ very well written and very helpful. So thanks!</p>
                         
 
                         
-                            <a rel="next" href="1_background_information.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next" href="1_why_futures.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                 <i class="fa fa-angle-right"></i>
                             </a>
                         
@@ -211,7 +211,7 @@ very well written and very helpful. So thanks!</p>
                 
 
                 
-                    <a href="1_background_information.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a href="1_why_futures.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
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diff --git a/book/print.html b/book/print.html
index 884a279..526c16d 100644
--- a/book/print.html
+++ b/book/print.html
@@ -80,7 +80,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">1.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">2.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">3.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">4.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">5.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">6.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -191,13 +191,392 @@ explore further and try your own ideas.</p>
 <code>async_std</code>, <code>Futures</code>, <code>libc</code>, <code>crossbeam</code> and many other libraries which so
 much is built upon.  Even the RFCs that much of the design is built upon is 
 very well written and very helpful. So thanks!</p>
+<h1><a class="header" href="#why-futures" id="why-futures">Why Futures</a></h1>
+<p>Before we go into the details about Futures in Rust, let's take a quick look
+at the alternatives for handling concurrent programming in general and some
+pros and cons for each of them.</p>
+<h2><a class="header" href="#threads-provided-by-the-operating-system" id="threads-provided-by-the-operating-system">Threads provided by the operating system</a></h2>
+<p>Now one way of accomplishing this is letting the OS take care of everything for 
+us. We do this by simply spawning a new OS thread for each task we want to
+accomplish and write code like we normally would.</p>
+<p><strong>Pros:</strong></p>
+<ul>
+<li>Simple</li>
+<li>Easy to use</li>
+<li>Switching between tasks is reasonably fast</li>
+<li>You get parallelism for free</li>
+</ul>
+<p><strong>Cons:</strong></p>
+<ul>
+<li>OS level threads come with a rather large stack. If you have many tasks
+waiting simultaneously (like you would in a web-server under heavy load) you'll
+run out of memory pretty soon.</li>
+<li>There are a lot of syscalls involved. This can be pretty costly when the number
+of tasks is high.</li>
+<li>The OS has many things it needs to handle. It might not switch back to your
+thread as fast as you'd wish.</li>
+<li>Might not be an option on some systems</li>
+</ul>
+<p>Using OS threads in Rust looks like this:</p>
+<pre><pre class="playpen"><code class="language-rust">use std::thread;
+
+fn main() {
+    println!(&quot;So we start the program here!&quot;);
+    let t1 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(200));
+        println!(&quot;We create tasks which gets run when they're finished!&quot;);
+    });
+
+    let t2 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(100));
+        println!(&quot;We can even chain callbacks...&quot;);
+        let t3 = thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(50));
+            println!(&quot;...like this!&quot;);
+        });
+        t3.join().unwrap();
+    });
+    println!(&quot;While our tasks are executing we can do other stuff here.&quot;);
+
+    t1.join().unwrap();
+    t2.join().unwrap();
+}
+</code></pre></pre>
+<h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
+<p>Green threads has been popularized by GO in the recent years. Green threads
+uses the same basic technique as operating systems does to handle concurrency.</p>
+<p>Green threads are implemented by setting up a stack for each task you want to
+execute and make the CPU &quot;jump&quot; from one stack to another to switch between
+tasks.</p>
+<p>The typical flow will be like this:</p>
+<ol>
+<li>Run som non-blocking code</li>
+<li>Make a blocking call to some external resource</li>
+<li>CPU jumps to the &quot;main&quot; thread which schedules a different thread to run and
+&quot;jumps&quot; to that stack</li>
+<li>Run some non-blocking code on the new thread until a new blocking call or the
+task is finished</li>
+<li>&quot;jumps&quot; back to the &quot;main&quot; thread and so on</li>
+</ol>
+<p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
+second as you read this.</p>
+<p>The main advantages are:</p>
+<ol>
+<li>Simple to use. The code will look like it does when using OS threads.</li>
+<li>A &quot;context switch&quot; is reasonably fast</li>
+<li>Each stack only gets a little memory to start with so you can have hundred of
+thousands of green threads running.</li>
+<li>It's easy to incorporate <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking"><em>preemtion</em></a>
+which puts a lot of control in the hands of the runtime implementors.</li>
+</ol>
+<p>The main cons are:</p>
+<ol>
+<li>The stacks might need to grow. Solving this is not easy and will have a cost.</li>
+<li>You need to save all the CPU state on every switch</li>
+<li>It's not a <em>zero cost abstraction</em> (which is one of the reasons Rust removed
+them early on).</li>
+<li>Complicated to implement correctly if you want to support many different
+platforms.</li>
+</ol>
+<p>If you were to implement green threads in Rust, it could look something like
+this:</p>
+<pre><code>The example presented below is from an earlier book I wrote about green
+threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
+If you want to know what's going on everything is explained in detail
+in that book.
+</code></pre>
+<pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
+#![feature(naked_functions)]
+use std::ptr;
+
+const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;
+const MAX_THREADS: usize = 4;
+static mut RUNTIME: usize = 0;
+
+pub struct Runtime {
+    threads: Vec&lt;Thread&gt;,
+    current: usize,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+enum State {
+    Available,
+    Running,
+    Ready,
+}
+
+struct Thread {
+    id: usize,
+    stack: Vec&lt;u8&gt;,
+    ctx: ThreadContext,
+    state: State,
+}
+
+#[derive(Debug, Default)]
+#[repr(C)]
+struct ThreadContext {
+    rsp: u64,
+    r15: u64,
+    r14: u64,
+    r13: u64,
+    r12: u64,
+    rbx: u64,
+    rbp: u64,
+}
+
+impl Thread {
+    fn new(id: usize) -&gt; Self {
+        Thread {
+            id,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Available,
+        }
+    }
+}
+
+impl Runtime {
+    pub fn new() -&gt; Self {
+        let base_thread = Thread {
+            id: 0,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Running,
+        };
+
+        let mut threads = vec![base_thread];
+        let mut available_threads: Vec&lt;Thread&gt; = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
+        threads.append(&amp;mut available_threads);
+        Runtime {
+            threads,
+            current: 0,
+        }
+    }
+
+    pub fn init(&amp;self) {
+        unsafe {
+            let r_ptr: *const Runtime = self;
+            RUNTIME = r_ptr as usize;
+        }
+    }
+
+    pub fn run(&amp;mut self) -&gt; ! {
+        while self.t_yield() {}
+        std::process::exit(0);
+    }
+
+    fn t_return(&amp;mut self) {
+        if self.current != 0 {
+            self.threads[self.current].state = State::Available;
+            self.t_yield();
+        }
+    }
+
+    fn t_yield(&amp;mut self) -&gt; bool {
+        let mut pos = self.current;
+        while self.threads[pos].state != State::Ready {
+            pos += 1;
+            if pos == self.threads.len() {
+                pos = 0;
+            }
+            if pos == self.current {
+                return false;
+            }
+        }
+        if self.threads[self.current].state != State::Available {
+            self.threads[self.current].state = State::Ready;
+        }
+        self.threads[pos].state = State::Running;
+        let old_pos = self.current;
+        self.current = pos;
+        unsafe {
+            switch(&amp;mut self.threads[old_pos].ctx, &amp;self.threads[pos].ctx);
+        }
+        self.threads.len() &gt; 0
+    }
+
+    pub fn spawn(&amp;mut self, f: fn()) {
+        let available = self
+            .threads
+            .iter_mut()
+            .find(|t| t.state == State::Available)
+            .expect(&quot;no available thread.&quot;);
+        let size = available.stack.len();
+        unsafe {
+            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
+            let s_ptr = (s_ptr as usize &amp; !15) as *mut u8;
+            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
+            available.ctx.rsp = s_ptr.offset(-32) as u64;
+        }
+        available.state = State::Ready;
+    }
+}
+
+fn guard() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_return();
+    };
+}
+
+pub fn yield_thread() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_yield();
+    };
+}
+
+#[naked]
+#[inline(never)]
+unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
+    asm!(&quot;
+        mov     %rsp, 0x00($0)
+        mov     %r15, 0x08($0)
+        mov     %r14, 0x10($0)
+        mov     %r13, 0x18($0)
+        mov     %r12, 0x20($0)
+        mov     %rbx, 0x28($0)
+        mov     %rbp, 0x30($0)
+   
+        mov     0x00($1), %rsp
+        mov     0x08($1), %r15
+        mov     0x10($1), %r14
+        mov     0x18($1), %r13
+        mov     0x20($1), %r12
+        mov     0x28($1), %rbx
+        mov     0x30($1), %rbp
+        ret
+        &quot;
+    :
+    :&quot;r&quot;(old), &quot;r&quot;(new)
+    :
+    : &quot;volatile&quot;, &quot;alignstack&quot;
+    );
+}
+
+fn main() {
+    let mut runtime = Runtime::new();
+    runtime.init();
+    runtime.spawn(|| {
+        println!(&quot;THREAD 1 STARTING&quot;);
+        let id = 1;
+        for i in 0..10 {
+            println!(&quot;thread: {} counter: {}&quot;, id, i);
+            yield_thread();
+        }
+        println!(&quot;THREAD 1 FINISHED&quot;);
+    });
+    runtime.spawn(|| {
+        println!(&quot;THREAD 2 STARTING&quot;);
+        let id = 2;
+        for i in 0..15 {
+            println!(&quot;thread: {} counter: {}&quot;, id, i);
+            yield_thread();
+        }
+        println!(&quot;THREAD 2 FINISHED&quot;);
+    });
+    runtime.run();
+}
+</code></pre></pre>
+<h3><a class="header" href="#callback-based-approach" id="callback-based-approach">Callback based approach</a></h3>
+<p>You probably already know this from Javascript since it's extremely common.
+The whole idea behind a callback based approach is to save a pointer to a
+set of instructions we want to run later on.</p>
+<p>The basic idea of not involving threads as a primary way to achieve concurrency
+is the common denominator for the rest of the approaches. Including the one
+Rust uses today which we'll soon get to.</p>
+<p><strong>Advantages:</strong></p>
+<ul>
+<li>Easy to implement in most languages</li>
+<li>No context switching</li>
+<li>Low memory overhead (in most cases)</li>
+</ul>
+<p><strong>Drawbacks:</strong></p>
+<ul>
+<li>Each task must save the state it needs for later, the memory usage will grow
+linearly with the number of tasks i .</li>
+<li>Can be hard to reason about, also known as &quot;callback hell&quot;.</li>
+<li>Sharing state between tasks is a hard problem in Rust using this approach due
+to it's ownership model.</li>
+</ul>
+<p>The</p>
+<p>If we did that in Rust it could look something like this:</p>
+<pre><pre class="playpen"><code class="language-rust">fn program_main() {
+    println!(&quot;So we start the program here!&quot;);
+    set_timeout(200, || {
+        println!(&quot;We create tasks which gets run when they're finished!&quot;);
+    });
+    set_timeout(100, || {
+        println!(&quot;We can even chain callbacks...&quot;);
+        set_timeout(50, || {
+            println!(&quot;...like this!&quot;);
+        })
+    });
+    println!(&quot;While our tasks are executing we can do other stuff here.&quot;);
+}
+
+fn main() {
+    RT.with(|rt| rt.run(program_main));
+}
+
+use std::sync::mpsc::{channel, Receiver, Sender};
+use std::{cell::RefCell, collections::HashMap, thread};
+
+thread_local! {
+    static RT: Runtime = Runtime::new();
+}
+
+struct Runtime {
+    callbacks: RefCell&lt;HashMap&lt;usize, Box&lt;dyn FnOnce() -&gt; ()&gt;&gt;&gt;,
+    next_id: RefCell&lt;usize&gt;,
+    evt_sender: Sender&lt;usize&gt;,
+    evt_reciever: Receiver&lt;usize&gt;,
+}
+
+fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) {
+    RT.with(|rt| {
+        let id = *rt.next_id.borrow();
+        *rt.next_id.borrow_mut() += 1;
+        rt.callbacks.borrow_mut().insert(id, Box::new(cb));
+        let evt_sender = rt.evt_sender.clone();
+        thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(ms));
+            evt_sender.send(id).unwrap();
+        });
+    });
+}
+
+impl Runtime {
+    fn new() -&gt; Self {
+        let (evt_sender, evt_reciever) = channel();
+        Runtime {
+            callbacks: RefCell::new(HashMap::new()),
+            next_id: RefCell::new(1),
+            evt_sender,
+            evt_reciever,
+        }
+    }
+
+    fn run(&amp;self, program: fn()) {
+        program();
+        for evt_id in &amp;self.evt_reciever {
+            let cb = self.callbacks.borrow_mut().remove(&amp;evt_id).unwrap();
+            cb();
+            if self.callbacks.borrow().is_empty() {
+                break;
+            }
+        }
+    }
+}
+</code></pre></pre>
 <h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
 <ul>
 <li>High level introduction to concurrency in Rust</li>
 <li>Knowing what Rust provides and not when working with async code</li>
-<li>Understanding why we need runtimes </li>
+<li>Understanding why we need a runtime-library in Rust</li>
 <li>Getting pointers to further reading on concurrency in general</li>
 </ul>
 </blockquote>
diff --git a/book/searchindex.js b/book/searchindex.js
index 19a9700..8bf5ce2 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"10","title":"Waker and Context"},"11":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"11","title":"The Waker"},"12":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"12","title":"The Context type"},"13":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"13","title":"Understanding the Waker"},"14":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"14","title":"Fat pointers in Rust"},"15":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"15","title":"Bonus section"},"16":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"16","title":"Generators"},"17":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"17","title":"Stackful coroutines/green threads"},"18":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"18","title":"Combinators"},"19":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"19","title":"Stackless coroutines/generators"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"20","title":"How generators work"},"21":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"21","title":"Bonus section - self referential generators in Rust today"},"22":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"22","title":"Pin"},"23":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"23","title":"Definitions"},"24":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"24","title":"Rules to remember"},"25":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"25","title":"Projection/structural pinning"},"26":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"26","title":"Pin and Drop"},"27":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"27","title":"Putting it all together"},"28":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"28","title":"Futures in Rust"},"29":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"29","title":"Implementing our own Futures"},"3":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need runtimes Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"3","title":"Some background information"},"30":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"30","title":"The Executor"},"31":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"31","title":"The Future implementation"},"32":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"32","title":"Why using thread park/unpark is a bad idea for a library"},"33":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"33","title":"The Reactor"},"34":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"34","title":"Async/Await and concurrent Futures"},"35":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"35","title":"Our finished code"},"36":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"36","title":"Conclusion and exercises"},"37":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"37","title":"Reader exercises"},"38":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"38","title":"Avoid thread::park"},"39":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"39","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"4":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"4","title":"Futures"},"40":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"40","title":"Avoid creating a new Waker for every event"},"41":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"41","title":"Could we implement more methods on our executor?"},"42":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"42","title":"Building a better exectuor"},"43":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"43","title":"Further reading"},"5":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"5","title":"Leaf futures"},"6":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"6","title":"Non-leaf-futures"},"7":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. 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You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Pros: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Cons: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. 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Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. The main advantages are: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. 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The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n}","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"10","title":"Waker and Context"},"11":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"11","title":"The Waker"},"12":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"12","title":"The Context type"},"13":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"13","title":"Understanding the Waker"},"14":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"14","title":"Fat pointers in Rust"},"15":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"15","title":"Bonus section"},"16":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"16","title":"Generators"},"17":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"17","title":"Stackful coroutines/green threads"},"18":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"18","title":"Combinators"},"19":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"19","title":"Stackless coroutines/generators"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"20","title":"How generators work"},"21":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"21","title":"Bonus section - self referential generators in Rust today"},"22":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"22","title":"Pin"},"23":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"23","title":"Definitions"},"24":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"24","title":"Rules to remember"},"25":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"25","title":"Projection/structural pinning"},"26":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"26","title":"Pin and Drop"},"27":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"27","title":"Putting it all together"},"28":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"28","title":"Futures in Rust"},"29":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"29","title":"Implementing our own Futures"},"3":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need runtimes Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"3","title":"Some background information"},"30":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"30","title":"The Executor"},"31":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"31","title":"The Future implementation"},"32":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"32","title":"Why using thread park/unpark is a bad idea for a library"},"33":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"33","title":"The Reactor"},"34":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"34","title":"Async/Await and concurrent Futures"},"35":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"35","title":"Our finished code"},"36":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"36","title":"Conclusion and exercises"},"37":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"37","title":"Reader exercises"},"38":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"38","title":"Avoid thread::park"},"39":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"39","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"4":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"4","title":"Futures"},"40":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"40","title":"Avoid creating a new Waker for every event"},"41":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"41","title":"Could we implement more methods on our executor?"},"42":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"42","title":"Building a better exectuor"},"43":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"43","title":"Further reading"},"5":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. 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You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Pros: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Cons: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. 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Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. The main advantages are: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. 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The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n}","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. 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\ No newline at end of file
diff --git a/src/1_background_information.md b/src/1_background_information.md
index 3546872..1ad05c7 100644
--- a/src/1_background_information.md
+++ b/src/1_background_information.md
@@ -13,18 +13,6 @@ information that will help demystify some of the concepts we encounter.
 Actually, after going through these concepts, implementing futures will seem
 pretty simple. I promise.
 
-## Popular alternatives for writing concurrent programs
-
-So let's kick this off by first taking a brief look into what the popular
-options we have for writing concurrent programs
-
-### Callback based approcah
-
-You probably already know this from Javascript since it's extremely common:
-
-
-
-
 ## Futures
 
 So what is a future?
diff --git a/src/1_why_futures.md b/src/1_why_futures.md
new file mode 100644
index 0000000..bfb7ece
--- /dev/null
+++ b/src/1_why_futures.md
@@ -0,0 +1,400 @@
+# Why Futures
+
+Before we go into the details about Futures in Rust, let's take a quick look
+at the alternatives for handling concurrent programming in general and some
+pros and cons for each of them.
+
+## Threads provided by the operating system
+
+Now one way of accomplishing this is letting the OS take care of everything for 
+us. We do this by simply spawning a new OS thread for each task we want to
+accomplish and write code like we normally would.
+
+**Pros:**
+
+- Simple
+- Easy to use
+- Switching between tasks is reasonably fast
+- You get parallelism for free
+
+**Cons:**
+
+- OS level threads come with a rather large stack. If you have many tasks
+waiting simultaneously (like you would in a web-server under heavy load) you'll
+run out of memory pretty soon.
+- There are a lot of syscalls involved. This can be pretty costly when the number
+of tasks is high.
+- The OS has many things it needs to handle. It might not switch back to your
+thread as fast as you'd wish.
+- Might not be an option on some systems
+
+Using OS threads in Rust looks like this:
+
+```rust
+use std::thread;
+
+fn main() {
+    println!("So we start the program here!");
+    let t1 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(200));
+        println!("We create tasks which gets run when they're finished!");
+    });
+
+    let t2 = thread::spawn(move || {
+        thread::sleep(std::time::Duration::from_millis(100));
+        println!("We can even chain callbacks...");
+        let t3 = thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(50));
+            println!("...like this!");
+        });
+        t3.join().unwrap();
+    });
+    println!("While our tasks are executing we can do other stuff here.");
+
+    t1.join().unwrap();
+    t2.join().unwrap();
+}
+```
+
+## Green threads
+
+Green threads has been popularized by GO in the recent years. Green threads
+uses the same basic technique as operating systems does to handle concurrency.
+
+Green threads are implemented by setting up a stack for each task you want to
+execute and make the CPU "jump" from one stack to another to switch between
+tasks.
+
+The typical flow will be like this:
+
+1. Run som non-blocking code
+2. Make a blocking call to some external resource
+3. CPU jumps to the "main" thread which schedules a different thread to run and
+"jumps" to that stack
+4. Run some non-blocking code on the new thread until a new blocking call or the
+task is finished
+5. "jumps" back to the "main" thread and so on
+
+These "jumps" are know as context switches. Your OS is doing it many times each
+second as you read this.
+
+
+The main advantages are:
+
+1. Simple to use. The code will look like it does when using OS threads.
+2. A "context switch" is reasonably fast
+3. Each stack only gets a little memory to start with so you can have hundred of
+thousands of green threads running.
+4. It's easy to incorporate [_preemtion_](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking)
+which puts a lot of control in the hands of the runtime implementors.
+
+The main cons are:
+
+1. The stacks might need to grow. Solving this is not easy and will have a cost.
+2. You need to save all the CPU state on every switch
+3. It's not a _zero cost abstraction_ (which is one of the reasons Rust removed
+them early on).
+4. Complicated to implement correctly if you want to support many different
+platforms.
+
+If you were to implement green threads in Rust, it could look something like
+this:
+
+    The example presented below is from an earlier book I wrote about green
+    threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
+    If you want to know what's going on everything is explained in detail
+    in that book.
+
+```rust
+#![feature(asm)]
+#![feature(naked_functions)]
+use std::ptr;
+
+const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;
+const MAX_THREADS: usize = 4;
+static mut RUNTIME: usize = 0;
+
+pub struct Runtime {
+    threads: Vec<Thread>,
+    current: usize,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+enum State {
+    Available,
+    Running,
+    Ready,
+}
+
+struct Thread {
+    id: usize,
+    stack: Vec<u8>,
+    ctx: ThreadContext,
+    state: State,
+}
+
+#[derive(Debug, Default)]
+#[repr(C)]
+struct ThreadContext {
+    rsp: u64,
+    r15: u64,
+    r14: u64,
+    r13: u64,
+    r12: u64,
+    rbx: u64,
+    rbp: u64,
+}
+
+impl Thread {
+    fn new(id: usize) -> Self {
+        Thread {
+            id,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Available,
+        }
+    }
+}
+
+impl Runtime {
+    pub fn new() -> Self {
+        let base_thread = Thread {
+            id: 0,
+            stack: vec![0_u8; DEFAULT_STACK_SIZE],
+            ctx: ThreadContext::default(),
+            state: State::Running,
+        };
+
+        let mut threads = vec![base_thread];
+        let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
+        threads.append(&mut available_threads);
+        Runtime {
+            threads,
+            current: 0,
+        }
+    }
+
+    pub fn init(&self) {
+        unsafe {
+            let r_ptr: *const Runtime = self;
+            RUNTIME = r_ptr as usize;
+        }
+    }
+
+    pub fn run(&mut self) -> ! {
+        while self.t_yield() {}
+        std::process::exit(0);
+    }
+
+    fn t_return(&mut self) {
+        if self.current != 0 {
+            self.threads[self.current].state = State::Available;
+            self.t_yield();
+        }
+    }
+
+    fn t_yield(&mut self) -> bool {
+        let mut pos = self.current;
+        while self.threads[pos].state != State::Ready {
+            pos += 1;
+            if pos == self.threads.len() {
+                pos = 0;
+            }
+            if pos == self.current {
+                return false;
+            }
+        }
+        if self.threads[self.current].state != State::Available {
+            self.threads[self.current].state = State::Ready;
+        }
+        self.threads[pos].state = State::Running;
+        let old_pos = self.current;
+        self.current = pos;
+        unsafe {
+            switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx);
+        }
+        self.threads.len() > 0
+    }
+
+    pub fn spawn(&mut self, f: fn()) {
+        let available = self
+            .threads
+            .iter_mut()
+            .find(|t| t.state == State::Available)
+            .expect("no available thread.");
+        let size = available.stack.len();
+        unsafe {
+            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
+            let s_ptr = (s_ptr as usize & !15) as *mut u8;
+            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
+            available.ctx.rsp = s_ptr.offset(-32) as u64;
+        }
+        available.state = State::Ready;
+    }
+}
+
+fn guard() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_return();
+    };
+}
+
+pub fn yield_thread() {
+    unsafe {
+        let rt_ptr = RUNTIME as *mut Runtime;
+        (*rt_ptr).t_yield();
+    };
+}
+
+#[naked]
+#[inline(never)]
+unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
+    asm!("
+        mov     %rsp, 0x00($0)
+        mov     %r15, 0x08($0)
+        mov     %r14, 0x10($0)
+        mov     %r13, 0x18($0)
+        mov     %r12, 0x20($0)
+        mov     %rbx, 0x28($0)
+        mov     %rbp, 0x30($0)
+   
+        mov     0x00($1), %rsp
+        mov     0x08($1), %r15
+        mov     0x10($1), %r14
+        mov     0x18($1), %r13
+        mov     0x20($1), %r12
+        mov     0x28($1), %rbx
+        mov     0x30($1), %rbp
+        ret
+        "
+    :
+    :"r"(old), "r"(new)
+    :
+    : "volatile", "alignstack"
+    );
+}
+
+fn main() {
+    let mut runtime = Runtime::new();
+    runtime.init();
+    runtime.spawn(|| {
+        println!("THREAD 1 STARTING");
+        let id = 1;
+        for i in 0..10 {
+            println!("thread: {} counter: {}", id, i);
+            yield_thread();
+        }
+        println!("THREAD 1 FINISHED");
+    });
+    runtime.spawn(|| {
+        println!("THREAD 2 STARTING");
+        let id = 2;
+        for i in 0..15 {
+            println!("thread: {} counter: {}", id, i);
+            yield_thread();
+        }
+        println!("THREAD 2 FINISHED");
+    });
+    runtime.run();
+}
+```
+
+### Callback based approach
+
+You probably already know this from Javascript since it's extremely common.
+The whole idea behind a callback based approach is to save a pointer to a
+set of instructions we want to run later on.
+
+The basic idea of not involving threads as a primary way to achieve concurrency
+is the common denominator for the rest of the approaches. Including the one
+Rust uses today which we'll soon get to.
+
+**Advantages:**
+
+- Easy to implement in most languages
+- No context switching
+- Low memory overhead (in most cases)
+
+**Drawbacks:**
+
+- Each task must save the state it needs for later, the memory usage will grow
+linearly with the number of tasks i .
+- Can be hard to reason about, also known as "callback hell".
+- Sharing state between tasks is a hard problem in Rust using this approach due
+to it's ownership model.
+
+The
+
+If we did that in Rust it could look something like this:
+
+```rust
+fn program_main() {
+    println!("So we start the program here!");
+    set_timeout(200, || {
+        println!("We create tasks which gets run when they're finished!");
+    });
+    set_timeout(100, || {
+        println!("We can even chain callbacks...");
+        set_timeout(50, || {
+            println!("...like this!");
+        })
+    });
+    println!("While our tasks are executing we can do other stuff here.");
+}
+
+fn main() {
+    RT.with(|rt| rt.run(program_main));
+}
+
+use std::sync::mpsc::{channel, Receiver, Sender};
+use std::{cell::RefCell, collections::HashMap, thread};
+
+thread_local! {
+    static RT: Runtime = Runtime::new();
+}
+
+struct Runtime {
+    callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>,
+    next_id: RefCell<usize>,
+    evt_sender: Sender<usize>,
+    evt_reciever: Receiver<usize>,
+}
+
+fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) {
+    RT.with(|rt| {
+        let id = *rt.next_id.borrow();
+        *rt.next_id.borrow_mut() += 1;
+        rt.callbacks.borrow_mut().insert(id, Box::new(cb));
+        let evt_sender = rt.evt_sender.clone();
+        thread::spawn(move || {
+            thread::sleep(std::time::Duration::from_millis(ms));
+            evt_sender.send(id).unwrap();
+        });
+    });
+}
+
+impl Runtime {
+    fn new() -> Self {
+        let (evt_sender, evt_reciever) = channel();
+        Runtime {
+            callbacks: RefCell::new(HashMap::new()),
+            next_id: RefCell::new(1),
+            evt_sender,
+            evt_reciever,
+        }
+    }
+
+    fn run(&self, program: fn()) {
+        program();
+        for evt_id in &self.evt_reciever {
+            let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap();
+            cb();
+            if self.callbacks.borrow().is_empty() {
+                break;
+            }
+        }
+    }
+}
+```
\ No newline at end of file
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 4ff2152..f7bb8ad 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -2,6 +2,7 @@
 
 [Introduction](./introduction.md)
 
+- [Why Futures](./1_why_futures.md)
 - [Some background information](./1_background_information.md)
 - [Waker and Context](./2_waker_context.md)
 - [Generators](./3_generators_pin.md)

From 8900666a552d67b33b7817ded74a43d9f4c7b34d Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Wed, 1 Apr 2020 23:15:36 +0200
Subject: [PATCH 03/10] formatting

---
 book/1_why_futures.html | 27 ++++++++++++++++-----------
 book/print.html         | 27 ++++++++++++++++-----------
 book/searchindex.js     |  2 +-
 book/searchindex.json   |  2 +-
 src/1_why_futures.md    | 29 +++++++++++++++++------------
 5 files changed, 51 insertions(+), 36 deletions(-)

diff --git a/book/1_why_futures.html b/book/1_why_futures.html
index 3441825..1460511 100644
--- a/book/1_why_futures.html
+++ b/book/1_why_futures.html
@@ -157,14 +157,14 @@ pros and cons for each of them.</p>
 <p>Now one way of accomplishing this is letting the OS take care of everything for 
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.</p>
-<p><strong>Pros:</strong></p>
+<p><strong>Advantages:</strong></p>
 <ul>
 <li>Simple</li>
 <li>Easy to use</li>
 <li>Switching between tasks is reasonably fast</li>
 <li>You get parallelism for free</li>
 </ul>
-<p><strong>Cons:</strong></p>
+<p><strong>Drawbacks:</strong></p>
 <ul>
 <li>OS level threads come with a rather large stack. If you have many tasks
 waiting simultaneously (like you would in a web-server under heavy load) you'll
@@ -218,7 +218,7 @@ task is finished</li>
 </ol>
 <p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
 second as you read this.</p>
-<p>The main advantages are:</p>
+<p><strong>Advantages:</strong></p>
 <ol>
 <li>Simple to use. The code will look like it does when using OS threads.</li>
 <li>A &quot;context switch&quot; is reasonably fast</li>
@@ -227,22 +227,23 @@ thousands of green threads running.</li>
 <li>It's easy to incorporate <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking"><em>preemtion</em></a>
 which puts a lot of control in the hands of the runtime implementors.</li>
 </ol>
-<p>The main cons are:</p>
+<p><strong>Drawbacks:</strong></p>
 <ol>
 <li>The stacks might need to grow. Solving this is not easy and will have a cost.</li>
 <li>You need to save all the CPU state on every switch</li>
-<li>It's not a <em>zero cost abstraction</em> (which is one of the reasons Rust removed
-them early on).</li>
+<li>It's not a <em>zero cost abstraction</em> (Rust had green threads early on and this
+was one of the reasons they were removed).</li>
 <li>Complicated to implement correctly if you want to support many different
 platforms.</li>
 </ol>
 <p>If you were to implement green threads in Rust, it could look something like
 this:</p>
-<pre><code>The example presented below is from an earlier book I wrote about green
-threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
-If you want to know what's going on everything is explained in detail
-in that book.
-</code></pre>
+<blockquote>
+<p>The example presented below is from an earlier book I wrote about green
+threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
+If you want to know what's going on you'll find everything explained in detail
+in that book.</p>
+</blockquote>
 <pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
 #![feature(naked_functions)]
 use std::ptr;
@@ -528,6 +529,10 @@ impl Runtime {
     }
 }
 </code></pre></pre>
+<p>We're keeping this super simple, and you might wonder what's the difference
+between this approach and the one using OS threads. The difference is that the
+callbacks are run on the same thread. The OS threads we create are basically
+just used as timers.</p>
 
                     </main>
 
diff --git a/book/print.html b/book/print.html
index 526c16d..86c77d8 100644
--- a/book/print.html
+++ b/book/print.html
@@ -199,14 +199,14 @@ pros and cons for each of them.</p>
 <p>Now one way of accomplishing this is letting the OS take care of everything for 
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.</p>
-<p><strong>Pros:</strong></p>
+<p><strong>Advantages:</strong></p>
 <ul>
 <li>Simple</li>
 <li>Easy to use</li>
 <li>Switching between tasks is reasonably fast</li>
 <li>You get parallelism for free</li>
 </ul>
-<p><strong>Cons:</strong></p>
+<p><strong>Drawbacks:</strong></p>
 <ul>
 <li>OS level threads come with a rather large stack. If you have many tasks
 waiting simultaneously (like you would in a web-server under heavy load) you'll
@@ -260,7 +260,7 @@ task is finished</li>
 </ol>
 <p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
 second as you read this.</p>
-<p>The main advantages are:</p>
+<p><strong>Advantages:</strong></p>
 <ol>
 <li>Simple to use. The code will look like it does when using OS threads.</li>
 <li>A &quot;context switch&quot; is reasonably fast</li>
@@ -269,22 +269,23 @@ thousands of green threads running.</li>
 <li>It's easy to incorporate <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking"><em>preemtion</em></a>
 which puts a lot of control in the hands of the runtime implementors.</li>
 </ol>
-<p>The main cons are:</p>
+<p><strong>Drawbacks:</strong></p>
 <ol>
 <li>The stacks might need to grow. Solving this is not easy and will have a cost.</li>
 <li>You need to save all the CPU state on every switch</li>
-<li>It's not a <em>zero cost abstraction</em> (which is one of the reasons Rust removed
-them early on).</li>
+<li>It's not a <em>zero cost abstraction</em> (Rust had green threads early on and this
+was one of the reasons they were removed).</li>
 <li>Complicated to implement correctly if you want to support many different
 platforms.</li>
 </ol>
 <p>If you were to implement green threads in Rust, it could look something like
 this:</p>
-<pre><code>The example presented below is from an earlier book I wrote about green
-threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
-If you want to know what's going on everything is explained in detail
-in that book.
-</code></pre>
+<blockquote>
+<p>The example presented below is from an earlier book I wrote about green
+threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
+If you want to know what's going on you'll find everything explained in detail
+in that book.</p>
+</blockquote>
 <pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
 #![feature(naked_functions)]
 use std::ptr;
@@ -570,6 +571,10 @@ impl Runtime {
     }
 }
 </code></pre></pre>
+<p>We're keeping this super simple, and you might wonder what's the difference
+between this approach and the one using OS threads. The difference is that the
+callbacks are run on the same thread. The OS threads we create are basically
+just used as timers.</p>
 <h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
diff --git a/book/searchindex.js b/book/searchindex.js
index 8bf5ce2..9272b0a 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Pros: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Cons: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. The main advantages are: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. The main cons are: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (which is one of the reasons Rust removed them early on). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green\nthreads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)\nIf you want to know what's going on everything is explained in detail\nin that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n}","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Pros: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Cons: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. The main advantages are: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. The main cons are: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (which is one of the reasons Rust removed them early on). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green\nthreads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)\nIf you want to know what's going on everything is explained in detail\nin that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n}","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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\ No newline at end of file
diff --git a/src/1_why_futures.md b/src/1_why_futures.md
index bfb7ece..2964e89 100644
--- a/src/1_why_futures.md
+++ b/src/1_why_futures.md
@@ -10,14 +10,14 @@ Now one way of accomplishing this is letting the OS take care of everything for
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.
 
-**Pros:**
+**Advantages:**
 
 - Simple
 - Easy to use
 - Switching between tasks is reasonably fast
 - You get parallelism for free
 
-**Cons:**
+**Drawbacks:**
 
 - OS level threads come with a rather large stack. If you have many tasks
 waiting simultaneously (like you would in a web-server under heavy load) you'll
@@ -79,7 +79,7 @@ These "jumps" are know as context switches. Your OS is doing it many times each
 second as you read this.
 
 
-The main advantages are:
+**Advantages:**
 
 1. Simple to use. The code will look like it does when using OS threads.
 2. A "context switch" is reasonably fast
@@ -88,22 +88,22 @@ thousands of green threads running.
 4. It's easy to incorporate [_preemtion_](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking)
 which puts a lot of control in the hands of the runtime implementors.
 
-The main cons are:
+**Drawbacks:**
 
 1. The stacks might need to grow. Solving this is not easy and will have a cost.
 2. You need to save all the CPU state on every switch
-3. It's not a _zero cost abstraction_ (which is one of the reasons Rust removed
-them early on).
-4. Complicated to implement correctly if you want to support many different
+3. It's not a _zero cost abstraction_ (Rust had green threads early on and this
+was one of the reasons they were removed).
+1. Complicated to implement correctly if you want to support many different
 platforms.
 
 If you were to implement green threads in Rust, it could look something like
 this:
 
-    The example presented below is from an earlier book I wrote about green
-    threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
-    If you want to know what's going on everything is explained in detail
-    in that book.
+>The example presented below is from an earlier book I wrote about green
+>threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
+>If you want to know what's going on you'll find everything explained in detail
+>in that book.
 
 ```rust
 #![feature(asm)]
@@ -397,4 +397,9 @@ impl Runtime {
         }
     }
 }
-```
\ No newline at end of file
+```
+
+We're keeping this super simple, and you might wonder what's the difference
+between this approach and the one using OS threads. The difference is that the
+callbacks are run on the same thread. The OS threads we create are basically
+just used as timers.
\ No newline at end of file

From 720cdfb36dc2d6f421463691638485edac7b36b9 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Fri, 3 Apr 2020 00:12:52 +0200
Subject: [PATCH 04/10] Added promises paragraph

---
 book/1_why_futures.html |  6 ++++++
 book/print.html         |  6 ++++++
 book/searchindex.js     |  2 +-
 book/searchindex.json   |  2 +-
 src/1_why_futures.md    | 15 ++++++++++++++-
 5 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/book/1_why_futures.html b/book/1_why_futures.html
index 1460511..ce25acb 100644
--- a/book/1_why_futures.html
+++ b/book/1_why_futures.html
@@ -533,6 +533,12 @@ impl Runtime {
 between this approach and the one using OS threads. The difference is that the
 callbacks are run on the same thread. The OS threads we create are basically
 just used as timers.</p>
+<h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
+<p>You might start to wonder by now, when are we going to talk about Futures?</p>
+<p>Soon, my dear friend. There is a point to all this. You see, syntactically
+the development of Rusts concurrency primitives mirrors that of Javascripts so
+we're soon about to segway over to our main topic.</p>
+<p>Promises is not only used in Javascript but in other languages as well</p>
 
                     </main>
 
diff --git a/book/print.html b/book/print.html
index 86c77d8..74db4a8 100644
--- a/book/print.html
+++ b/book/print.html
@@ -575,6 +575,12 @@ impl Runtime {
 between this approach and the one using OS threads. The difference is that the
 callbacks are run on the same thread. The OS threads we create are basically
 just used as timers.</p>
+<h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
+<p>You might start to wonder by now, when are we going to talk about Futures?</p>
+<p>Soon, my dear friend. There is a point to all this. You see, syntactically
+the development of Rusts concurrency primitives mirrors that of Javascripts so
+we're soon about to segway over to our main topic.</p>
+<p>Promises is not only used in Javascript but in other languages as well</p>
 <h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
diff --git a/book/searchindex.js b/book/searchindex.js
index 9272b0a..e555ab4 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Soon, my dear friend. There is a point to all this. You see, syntactically the development of Rusts concurrency primitives mirrors that of Javascripts so we're soon about to segway over to our main topic. Promises is not only used in Javascript but in other languages as well","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"10","title":"Non-leaf-futures"},"11":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"11","title":"Runtimes"},"12":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"12","title":"What Rust's standard library takes care of"},"13":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"13","title":"Bonus section"},"14":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"14","title":"Waker and Context"},"15":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"15","title":"The Waker"},"16":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"16","title":"The Context type"},"17":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"17","title":"Understanding the Waker"},"18":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"18","title":"Fat pointers in Rust"},"19":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"19","title":"Bonus section"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"20","title":"Generators"},"21":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"21","title":"Stackful coroutines/green threads"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"28","title":"Rules to remember"},"29":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"29","title":"Projection/structural pinning"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"30","title":"Pin and Drop"},"31":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"31","title":"Putting it all together"},"32":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"32","title":"Futures in Rust"},"33":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"33","title":"Implementing our own Futures"},"34":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"34","title":"The Executor"},"35":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"35","title":"The Future implementation"},"36":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"36","title":"Why using thread park/unpark is a bad idea for a library"},"37":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"37","title":"The Reactor"},"38":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"38","title":"Async/Await and concurrent Futures"},"39":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"39","title":"Our finished code"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"40","title":"Conclusion and exercises"},"41":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"41","title":"Reader exercises"},"42":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"42","title":"Avoid thread::park"},"43":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"43","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"44":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"44","title":"Avoid creating a new Waker for every event"},"45":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"45","title":"Could we implement more methods on our executor?"},"46":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"46","title":"Building a better exectuor"},"47":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"47","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"7","title":"Some background information"},"8":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one another.","breadcrumbs":"Futures","id":"8","title":"Futures"},"9":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"9","title":"Leaf 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Soon, my dear friend. There is a point to all this. You see, syntactically the development of Rusts concurrency primitives mirrors that of Javascripts so we're soon about to segway over to our main topic. Promises is not only used in Javascript but in other languages as well","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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\ No newline at end of file
diff --git a/src/1_why_futures.md b/src/1_why_futures.md
index 2964e89..c8e5c81 100644
--- a/src/1_why_futures.md
+++ b/src/1_why_futures.md
@@ -402,4 +402,17 @@ impl Runtime {
 We're keeping this super simple, and you might wonder what's the difference
 between this approach and the one using OS threads. The difference is that the
 callbacks are run on the same thread. The OS threads we create are basically
-just used as timers.
\ No newline at end of file
+just used as timers.
+
+## From callbacks to promises
+
+You might start to wonder by now, when are we going to talk about Futures?
+
+Soon, my dear friend. There is a point to all this. You see, syntactically
+the development of Rusts concurrency primitives mirrors that of Javascripts so
+we're soon about to segway over to our main topic.
+
+Promises is not only used in Javascript but in other languages as well
+
+
+

From c8cff655ec8f324ecb13b43ccba37888aff65f78 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sat, 4 Apr 2020 18:12:02 +0200
Subject: [PATCH 05/10] finished why futures

---
 book/1_why_futures.html |  88 ++++++++++++++++++++++++++++-----
 book/print.html         |  88 ++++++++++++++++++++++++++++-----
 book/searchindex.js     |   2 +-
 book/searchindex.json   |   2 +-
 src/1_why_futures.md    | 105 +++++++++++++++++++++++++++++++++++-----
 5 files changed, 248 insertions(+), 37 deletions(-)

diff --git a/book/1_why_futures.html b/book/1_why_futures.html
index ce25acb..3864a0f 100644
--- a/book/1_why_futures.html
+++ b/book/1_why_futures.html
@@ -200,6 +200,22 @@ fn main() {
     t2.join().unwrap();
 }
 </code></pre></pre>
+<p>OS threads sure has some pretty big advantages. So why all this talk about
+&quot;async&quot; and concurrency in the first place?</p>
+<p>First of all. For computers to be <a href="https://en.wikipedia.org/wiki/Efficiency"><em>efficient</em></a> it needs to multitask. Once you
+start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>) 
+you'll see concurrency everywhere. It's very fundamental in everything we do.</p>
+<p>Secondly, we have the web. Webservers is all about I/O and handling small tasks
+(requests). When the number of small tasks is large it's not a good fit for OS
+threads as of today because of the memory they require and the overhead involved
+when creating new threads. That's why you'll see so many async web frameworks
+and database drivers today.</p>
+<p>However, for a huge number of tasks, the standard OS threads will often be the
+right solution. So, just think twice about your problem before you reach for an
+async library.</p>
+<p>Now, let's look at some other options for multitasking. They all have in common
+that they implement a way to do multitasking by implementing a &quot;userland&quot;
+runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
 <p>Green threads has been popularized by GO in the recent years. Green threads
 uses the same basic technique as operating systems does to handle concurrency.</p>
@@ -454,13 +470,13 @@ Rust uses today which we'll soon get to.</p>
 <p><strong>Drawbacks:</strong></p>
 <ul>
 <li>Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of tasks i .</li>
-<li>Can be hard to reason about, also known as &quot;callback hell&quot;.</li>
+linearly with the number of callbacks in a task.</li>
+<li>Can be hard to reason about, many people already know this as as &quot;callback hell&quot;.</li>
 <li>Sharing state between tasks is a hard problem in Rust using this approach due
 to it's ownership model.</li>
 </ul>
-<p>The</p>
-<p>If we did that in Rust it could look something like this:</p>
+<p>An extremely simplified example of a how a callback based approach could look
+like is:</p>
 <pre><pre class="playpen"><code class="language-rust">fn program_main() {
     println!(&quot;So we start the program here!&quot;);
     set_timeout(200, || {
@@ -530,15 +546,65 @@ impl Runtime {
 }
 </code></pre></pre>
 <p>We're keeping this super simple, and you might wonder what's the difference
-between this approach and the one using OS threads. The difference is that the
-callbacks are run on the same thread. The OS threads we create are basically
-just used as timers.</p>
+between this approach and the one using OS threads an passing in the callbacks
+to the OS threads directly. The difference is that the callbacks are run on the
+same thread using this example. The OS threads we create are basically just used
+as timers.</p>
 <h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
 <p>You might start to wonder by now, when are we going to talk about Futures?</p>
-<p>Soon, my dear friend. There is a point to all this. You see, syntactically
-the development of Rusts concurrency primitives mirrors that of Javascripts so
-we're soon about to segway over to our main topic.</p>
-<p>Promises is not only used in Javascript but in other languages as well</p>
+<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and <code>deferreds</code> are 
+often used interchangeably in day to day jargon. There are some formal
+differences between which is used which we'll not cover here but it's worth
+explaining promises a bit as a segway to Rusts Futures.</p>
+<p>First of all, many languages has a concept of promises but I'll use the ones
+from Javascript as an example.</p>
+<p>Promises is one way to deal with the complexity which comes with a callback
+based approach.</p>
+<p>Instead of:</p>
+<pre><code class="language-js ignore">setTimer(200, () =&gt; {
+    setTimer(100, () =&gt; {
+        setTimer(50, () =&gt; {
+            console.log(&quot;I'm the last one&quot;);
+        })
+    })
+})
+</code></pre>
+<p>We can to this:</p>
+<pre><code class="language-js ignore">function timer(ms) {
+    return new Promise((resolve) =&gt; setTimeout(resolve, ms))
+}
+
+timer(200)
+.then(() =&gt; return timer(100))
+.then(() =&gt; return timer(50))
+.then(() =&gt; console.log(&quot;I'm the last one));
+</code></pre>
+<p>The change is even more substantial under the hood. You see, promises return
+a state which is either <code>pending</code>, <code>fulfilled</code> or <code>rejected</code>. So when we call
+<code>timer(200)</code> in the sample above, we get back a promise in the state <code>pending</code>.</p>
+<p>A <code>promise</code> is a state machine which makes one <code>step</code> when the I/O operation
+is finished.</p>
+<p>This allows for an even better syntax where we now can write our last example
+like this:</p>
+<pre><code>async function run() {
+    await timer(200);
+    await timer(100);
+    await timer(50);
+    console.log(&quot;I'm the last one&quot;);
+}
+</code></pre>
+<p>Now this is also where the similarities stop. The reason we went through all
+this is to get an introduction and get into the right mindset for exploring
+Rusts Futures.</p>
+<p>Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
+promises example above, and Rusts Futures 3.0 is a lot like async/await
+in our last example.</p>
+<blockquote>
+<p>To avoid confusion later on: There is one difference you should know. Javascript
+promises are <em>eagerly</em> evaluated. That means that once it's created, it starts
+running a task. Rusts Futures on the other hand is <em>lazily</em> evaluated. They
+need to be polled once before they do any work. You'll see in a moment.</p>
+</blockquote>
 
                     </main>
 
diff --git a/book/print.html b/book/print.html
index 74db4a8..5dfc819 100644
--- a/book/print.html
+++ b/book/print.html
@@ -242,6 +242,22 @@ fn main() {
     t2.join().unwrap();
 }
 </code></pre></pre>
+<p>OS threads sure has some pretty big advantages. So why all this talk about
+&quot;async&quot; and concurrency in the first place?</p>
+<p>First of all. For computers to be <a href="https://en.wikipedia.org/wiki/Efficiency"><em>efficient</em></a> it needs to multitask. Once you
+start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>) 
+you'll see concurrency everywhere. It's very fundamental in everything we do.</p>
+<p>Secondly, we have the web. Webservers is all about I/O and handling small tasks
+(requests). When the number of small tasks is large it's not a good fit for OS
+threads as of today because of the memory they require and the overhead involved
+when creating new threads. That's why you'll see so many async web frameworks
+and database drivers today.</p>
+<p>However, for a huge number of tasks, the standard OS threads will often be the
+right solution. So, just think twice about your problem before you reach for an
+async library.</p>
+<p>Now, let's look at some other options for multitasking. They all have in common
+that they implement a way to do multitasking by implementing a &quot;userland&quot;
+runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
 <p>Green threads has been popularized by GO in the recent years. Green threads
 uses the same basic technique as operating systems does to handle concurrency.</p>
@@ -496,13 +512,13 @@ Rust uses today which we'll soon get to.</p>
 <p><strong>Drawbacks:</strong></p>
 <ul>
 <li>Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of tasks i .</li>
-<li>Can be hard to reason about, also known as &quot;callback hell&quot;.</li>
+linearly with the number of callbacks in a task.</li>
+<li>Can be hard to reason about, many people already know this as as &quot;callback hell&quot;.</li>
 <li>Sharing state between tasks is a hard problem in Rust using this approach due
 to it's ownership model.</li>
 </ul>
-<p>The</p>
-<p>If we did that in Rust it could look something like this:</p>
+<p>An extremely simplified example of a how a callback based approach could look
+like is:</p>
 <pre><pre class="playpen"><code class="language-rust">fn program_main() {
     println!(&quot;So we start the program here!&quot;);
     set_timeout(200, || {
@@ -572,15 +588,65 @@ impl Runtime {
 }
 </code></pre></pre>
 <p>We're keeping this super simple, and you might wonder what's the difference
-between this approach and the one using OS threads. The difference is that the
-callbacks are run on the same thread. The OS threads we create are basically
-just used as timers.</p>
+between this approach and the one using OS threads an passing in the callbacks
+to the OS threads directly. The difference is that the callbacks are run on the
+same thread using this example. The OS threads we create are basically just used
+as timers.</p>
 <h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
 <p>You might start to wonder by now, when are we going to talk about Futures?</p>
-<p>Soon, my dear friend. There is a point to all this. You see, syntactically
-the development of Rusts concurrency primitives mirrors that of Javascripts so
-we're soon about to segway over to our main topic.</p>
-<p>Promises is not only used in Javascript but in other languages as well</p>
+<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and <code>deferreds</code> are 
+often used interchangeably in day to day jargon. There are some formal
+differences between which is used which we'll not cover here but it's worth
+explaining promises a bit as a segway to Rusts Futures.</p>
+<p>First of all, many languages has a concept of promises but I'll use the ones
+from Javascript as an example.</p>
+<p>Promises is one way to deal with the complexity which comes with a callback
+based approach.</p>
+<p>Instead of:</p>
+<pre><code class="language-js ignore">setTimer(200, () =&gt; {
+    setTimer(100, () =&gt; {
+        setTimer(50, () =&gt; {
+            console.log(&quot;I'm the last one&quot;);
+        })
+    })
+})
+</code></pre>
+<p>We can to this:</p>
+<pre><code class="language-js ignore">function timer(ms) {
+    return new Promise((resolve) =&gt; setTimeout(resolve, ms))
+}
+
+timer(200)
+.then(() =&gt; return timer(100))
+.then(() =&gt; return timer(50))
+.then(() =&gt; console.log(&quot;I'm the last one));
+</code></pre>
+<p>The change is even more substantial under the hood. You see, promises return
+a state which is either <code>pending</code>, <code>fulfilled</code> or <code>rejected</code>. So when we call
+<code>timer(200)</code> in the sample above, we get back a promise in the state <code>pending</code>.</p>
+<p>A <code>promise</code> is a state machine which makes one <code>step</code> when the I/O operation
+is finished.</p>
+<p>This allows for an even better syntax where we now can write our last example
+like this:</p>
+<pre><code>async function run() {
+    await timer(200);
+    await timer(100);
+    await timer(50);
+    console.log(&quot;I'm the last one&quot;);
+}
+</code></pre>
+<p>Now this is also where the similarities stop. The reason we went through all
+this is to get an introduction and get into the right mindset for exploring
+Rusts Futures.</p>
+<p>Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
+promises example above, and Rusts Futures 3.0 is a lot like async/await
+in our last example.</p>
+<blockquote>
+<p>To avoid confusion later on: There is one difference you should know. Javascript
+promises are <em>eagerly</em> evaluated. That means that once it's created, it starts
+running a task. Rusts Futures on the other hand is <em>lazily</em> evaluated. They
+need to be polled once before they do any work. You'll see in a moment.</p>
+</blockquote>
 <h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
diff --git a/book/searchindex.js b/book/searchindex.js
index e555ab4..351c70e 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of tasks, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by implementing a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a task. Can be hard to reason about, many people already know this as as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and deferreds are often used interchangeably in day to day jargon. There are some formal differences between which is used which we'll not cover here but it's worth explaining promises a bit as a segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript as an example. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }) })\n}) We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state which is either pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. A promise is a state machine which makes one step when the I/O operation is finished. This allows for an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} Now this is also where the similarities stop. The reason we went through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the promises example above, and Rusts Futures 3.0 is a lot like async/await in our last example. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n}","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of tasks i . Can be hard to reason about, also known as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. The If we did that in Rust it could look something like this: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads. The difference is that the callbacks are run on the same thread. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Soon, my dear friend. There is a point to all this. You see, syntactically the development of Rusts concurrency primitives mirrors that of Javascripts so we're soon about to segway over to our main topic. Promises is not only used in Javascript but in other languages as well","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of tasks, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by implementing a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a task. Can be hard to reason about, many people already know this as as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and deferreds are often used interchangeably in day to day jargon. There are some formal differences between which is used which we'll not cover here but it's worth explaining promises a bit as a segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript as an example. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }) })\n}) We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state which is either pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. A promise is a state machine which makes one step when the I/O operation is finished. This allows for an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} Now this is also where the similarities stop. The reason we went through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the promises example above, and Rusts Futures 3.0 is a lot like async/await in our last example. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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diff --git a/src/1_why_futures.md b/src/1_why_futures.md
index c8e5c81..4f37161 100644
--- a/src/1_why_futures.md
+++ b/src/1_why_futures.md
@@ -56,6 +56,27 @@ fn main() {
 }
 ```
 
+OS threads sure has some pretty big advantages. So why all this talk about
+"async" and concurrency in the first place?
+
+First of all. For computers to be [_efficient_](https://en.wikipedia.org/wiki/Efficiency) it needs to multitask. Once you
+start to look under the covers (like [how an operating system works](https://os.phil-opp.com/async-await/)) 
+you'll see concurrency everywhere. It's very fundamental in everything we do.
+
+Secondly, we have the web. Webservers is all about I/O and handling small tasks
+(requests). When the number of small tasks is large it's not a good fit for OS
+threads as of today because of the memory they require and the overhead involved
+when creating new threads. That's why you'll see so many async web frameworks
+and database drivers today.
+
+However, for a huge number of tasks, the standard OS threads will often be the
+right solution. So, just think twice about your problem before you reach for an
+async library.
+
+Now, let's look at some other options for multitasking. They all have in common
+that they implement a way to do multitasking by implementing a "userland"
+runtime:
+
 ## Green threads
 
 Green threads has been popularized by GO in the recent years. Green threads
@@ -78,7 +99,6 @@ task is finished
 These "jumps" are know as context switches. Your OS is doing it many times each
 second as you read this.
 
-
 **Advantages:**
 
 1. Simple to use. The code will look like it does when using OS threads.
@@ -320,14 +340,13 @@ Rust uses today which we'll soon get to.
 **Drawbacks:**
 
 - Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of tasks i .
-- Can be hard to reason about, also known as "callback hell".
+linearly with the number of callbacks in a task.
+- Can be hard to reason about, many people already know this as as "callback hell".
 - Sharing state between tasks is a hard problem in Rust using this approach due
 to it's ownership model.
 
-The
-
-If we did that in Rust it could look something like this:
+An extremely simplified example of a how a callback based approach could look
+like is:
 
 ```rust
 fn program_main() {
@@ -400,19 +419,79 @@ impl Runtime {
 ```
 
 We're keeping this super simple, and you might wonder what's the difference
-between this approach and the one using OS threads. The difference is that the
-callbacks are run on the same thread. The OS threads we create are basically
-just used as timers.
+between this approach and the one using OS threads an passing in the callbacks
+to the OS threads directly. The difference is that the callbacks are run on the
+same thread using this example. The OS threads we create are basically just used
+as timers.
 
 ## From callbacks to promises
 
 You might start to wonder by now, when are we going to talk about Futures?
 
-Soon, my dear friend. There is a point to all this. You see, syntactically
-the development of Rusts concurrency primitives mirrors that of Javascripts so
-we're soon about to segway over to our main topic.
+Well, we're getting there. You see `promises`, `futures` and `deferreds` are 
+often used interchangeably in day to day jargon. There are some formal
+differences between which is used which we'll not cover here but it's worth
+explaining promises a bit as a segway to Rusts Futures.
 
-Promises is not only used in Javascript but in other languages as well
+First of all, many languages has a concept of promises but I'll use the ones
+from Javascript as an example.
 
+Promises is one way to deal with the complexity which comes with a callback
+based approach.
 
+Instead of:
 
+```js, ignore
+setTimer(200, () => {
+    setTimer(100, () => {
+        setTimer(50, () => {
+            console.log("I'm the last one");
+        })
+    })
+})
+```
+
+We can to this:
+
+```js, ignore
+function timer(ms) {
+    return new Promise((resolve) => setTimeout(resolve, ms))
+}
+
+timer(200)
+.then(() => return timer(100))
+.then(() => return timer(50))
+.then(() => console.log("I'm the last one));
+```
+
+The change is even more substantial under the hood. You see, promises return
+a state which is either `pending`, `fulfilled` or `rejected`. So when we call
+`timer(200)` in the sample above, we get back a promise in the state `pending`.
+
+A `promise` is a state machine which makes one `step` when the I/O operation
+is finished.
+
+This allows for an even better syntax where we now can write our last example
+like this:
+
+```
+async function run() {
+    await timer(200);
+    await timer(100);
+    await timer(50);
+    console.log("I'm the last one");
+}
+```
+
+Now this is also where the similarities stop. The reason we went through all
+this is to get an introduction and get into the right mindset for exploring
+Rusts Futures.
+
+Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
+promises example above, and Rusts Futures 3.0 is a lot like async/await
+in our last example.
+
+>To avoid confusion later on: There is one difference you should know. Javascript
+>promises are _eagerly_ evaluated. That means that once it's created, it starts
+>running a task. Rusts Futures on the other hand is _lazily_ evaluated. They
+>need to be polled once before they do any work. You'll see in a moment.
\ No newline at end of file

From 0d0c265dc7e0e23b993a5b04478c75991af496f0 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sat, 4 Apr 2020 23:40:48 +0200
Subject: [PATCH 06/10] finished background information

---
 ...res.html => 0_background_information.html} | 198 +++++++++------
 ...nformation.html => 1_futures_in_rust.html} |  10 +-
 book/2_waker_context.html                     |   6 +-
 book/3_generators_pin.html                    |   2 +-
 book/4_pin.html                               |   2 +-
 book/6_future_example.html                    |   2 +-
 book/8_finished_example.html                  |   2 +-
 book/conclusion.html                          |   2 +-
 book/index.html                               |   2 +-
 book/introduction.html                        |   6 +-
 book/print.html                               | 196 +++++++++------
 book/searchindex.js                           |   2 +-
 book/searchindex.json                         |   2 +-
 ...futures.md => 0_background_information.md} | 229 +++++++++++-------
 ...nd_information.md => 1_futures_in_rust.md} |   2 +-
 src/SUMMARY.md                                |   4 +-
 16 files changed, 399 insertions(+), 268 deletions(-)
 rename book/{1_why_futures.html => 0_background_information.html} (76%)
 rename book/{1_background_information.html => 1_futures_in_rust.html} (93%)
 rename src/{1_why_futures.md => 0_background_information.md} (62%)
 rename src/{1_background_information.md => 1_futures_in_rust.md} (98%)

diff --git a/book/1_why_futures.html b/book/0_background_information.html
similarity index 76%
rename from book/1_why_futures.html
rename to book/0_background_information.html
index 3864a0f..45b4ae7 100644
--- a/book/1_why_futures.html
+++ b/book/0_background_information.html
@@ -3,7 +3,7 @@
     <head>
         <!-- Book generated using mdBook -->
         <meta charset="UTF-8">
-        <title>Why Futures - Futures Explained in 200 Lines of Rust</title>
+        <title>Background information - Futures Explained in 200 Lines of Rust</title>
         
 
         <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html" class="active"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html" class="active"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -149,14 +149,22 @@
 
                 <div id="content" class="content">
                     <main>
-                        <h1><a class="header" href="#why-futures" id="why-futures">Why Futures</a></h1>
+                        <h1><a class="header" href="#some-background-information" id="some-background-information">Some Background Information</a></h1>
 <p>Before we go into the details about Futures in Rust, let's take a quick look
 at the alternatives for handling concurrent programming in general and some
 pros and cons for each of them.</p>
+<p>While we do that we'll get some information on concurrency which will make it
+easier for us when we dive in to Futures specifically.</p>
+<blockquote>
+<p>For fun, I've added a small snipped of runnable code with most of the examples.
+If you're like me, things get way more interesting then and maybe you'll se some
+things you haven't seen before along the way.</p>
+</blockquote>
 <h2><a class="header" href="#threads-provided-by-the-operating-system" id="threads-provided-by-the-operating-system">Threads provided by the operating system</a></h2>
-<p>Now one way of accomplishing this is letting the OS take care of everything for 
+<p>Now, one way of accomplishing this is letting the OS take care of everything for
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.</p>
+<p>The runtime we use to handle concurrency for us is the operating system itself.</p>
 <p><strong>Advantages:</strong></p>
 <ul>
 <li>Simple</li>
@@ -168,14 +176,14 @@ accomplish and write code like we normally would.</p>
 <ul>
 <li>OS level threads come with a rather large stack. If you have many tasks
 waiting simultaneously (like you would in a web-server under heavy load) you'll
-run out of memory pretty soon.</li>
+run out of memory pretty fast.</li>
 <li>There are a lot of syscalls involved. This can be pretty costly when the number
 of tasks is high.</li>
 <li>The OS has many things it needs to handle. It might not switch back to your
 thread as fast as you'd wish.</li>
 <li>Might not be an option on some systems</li>
 </ul>
-<p>Using OS threads in Rust looks like this:</p>
+<p><strong>Using OS threads in Rust looks like this:</strong></p>
 <pre><pre class="playpen"><code class="language-rust">use std::thread;
 
 fn main() {
@@ -203,18 +211,20 @@ fn main() {
 <p>OS threads sure has some pretty big advantages. So why all this talk about
 &quot;async&quot; and concurrency in the first place?</p>
 <p>First of all. For computers to be <a href="https://en.wikipedia.org/wiki/Efficiency"><em>efficient</em></a> it needs to multitask. Once you
-start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>) 
+start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>)
 you'll see concurrency everywhere. It's very fundamental in everything we do.</p>
 <p>Secondly, we have the web. Webservers is all about I/O and handling small tasks
 (requests). When the number of small tasks is large it's not a good fit for OS
 threads as of today because of the memory they require and the overhead involved
-when creating new threads. That's why you'll see so many async web frameworks
-and database drivers today.</p>
-<p>However, for a huge number of tasks, the standard OS threads will often be the
+when creating new threads. This gets even more relevant when the load is variable
+which means the current number of tasks a program has at any point in time is
+unpredictable. That's why you'll see so many async web frameworks and database
+drivers today.</p>
+<p>However, for a huge number of problems, the standard OS threads will often be the
 right solution. So, just think twice about your problem before you reach for an
 async library.</p>
 <p>Now, let's look at some other options for multitasking. They all have in common
-that they implement a way to do multitasking by implementing a &quot;userland&quot;
+that they implement a way to do multitasking by having a &quot;userland&quot;
 runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
 <p>Green threads has been popularized by GO in the recent years. Green threads
@@ -255,10 +265,12 @@ platforms.</li>
 <p>If you were to implement green threads in Rust, it could look something like
 this:</p>
 <blockquote>
-<p>The example presented below is from an earlier book I wrote about green
-threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
+<p>The example presented below is an adapted example from an earlier gitbook I
+wrote about green threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
 If you want to know what's going on you'll find everything explained in detail
-in that book.</p>
+in that book. The code below is wildly unsafe and it's just to show a real example.
+It's not in any way meant to showcase &quot;best practice&quot;. Just so we're on
+the same page.</p>
 </blockquote>
 <pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
 #![feature(naked_functions)]
@@ -285,6 +297,7 @@ struct Thread {
     stack: Vec&lt;u8&gt;,
     ctx: ThreadContext,
     state: State,
+    task: Option&lt;Box&lt;dyn Fn()&gt;&gt;,
 }
 
 #[derive(Debug, Default)]
@@ -297,6 +310,7 @@ struct ThreadContext {
     r12: u64,
     rbx: u64,
     rbp: u64,
+    thread_ptr: u64,
 }
 
 impl Thread {
@@ -306,6 +320,7 @@ impl Thread {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Available,
+            task: None,
         }
     }
 }
@@ -317,11 +332,14 @@ impl Runtime {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Running,
+            task: None,
         };
 
         let mut threads = vec![base_thread];
+        threads[0].ctx.thread_ptr = &amp;threads[0] as *const Thread as u64;
         let mut available_threads: Vec&lt;Thread&gt; = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
         threads.append(&amp;mut available_threads);
+
         Runtime {
             threads,
             current: 0,
@@ -358,40 +376,56 @@ impl Runtime {
                 return false;
             }
         }
+        
         if self.threads[self.current].state != State::Available {
             self.threads[self.current].state = State::Ready;
         }
+
         self.threads[pos].state = State::Running;
         let old_pos = self.current;
         self.current = pos;
+
         unsafe {
             switch(&amp;mut self.threads[old_pos].ctx, &amp;self.threads[pos].ctx);
         }
-        self.threads.len() &gt; 0
+        true
     }
 
-    pub fn spawn(&amp;mut self, f: fn()) {
-        let available = self
-            .threads
-            .iter_mut()
-            .find(|t| t.state == State::Available)
-            .expect(&quot;no available thread.&quot;);
-        let size = available.stack.len();
+    pub fn spawn&lt;F: Fn() + 'static&gt;(f: F){
         unsafe {
-            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
-            let s_ptr = (s_ptr as usize &amp; !15) as *mut u8;
-            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
-            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
-            available.ctx.rsp = s_ptr.offset(-32) as u64;
+            let rt_ptr = RUNTIME as *mut Runtime;
+            let available = (*rt_ptr)
+                .threads
+                .iter_mut()
+                .find(|t| t.state == State::Available)
+                .expect(&quot;no available thread.&quot;);
+                
+            let size = available.stack.len();
+            let s_ptr = available.stack.as_mut_ptr();
+            available.task = Some(Box::new(f));
+            available.ctx.thread_ptr = available as *const Thread as u64;
+            ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64);
+            available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64;
+            available.state = State::Ready;
         }
-        available.state = State::Ready;
     }
 }
 
+fn call(thread: u64) {
+    let thread = unsafe { &amp;*(thread as *const Thread) };
+    if let Some(f) = &amp;thread.task {
+        f();
+    }
+}
+
+#[naked]
 fn guard() {
     unsafe {
         let rt_ptr = RUNTIME as *mut Runtime;
-        (*rt_ptr).t_return();
+        let rt = &amp;mut *rt_ptr;
+        println!(&quot;THREAD {} FINISHED.&quot;, rt.threads[rt.current].id);
+        rt.t_return();
     };
 }
 
@@ -413,7 +447,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     %r12, 0x20($0)
         mov     %rbx, 0x28($0)
         mov     %rbp, 0x30($0)
-   
+
         mov     0x00($1), %rsp
         mov     0x08($1), %r15
         mov     0x10($1), %r14
@@ -421,43 +455,45 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     0x20($1), %r12
         mov     0x28($1), %rbx
         mov     0x30($1), %rbp
+        mov     0x38($1), %rdi
         ret
         &quot;
     :
-    :&quot;r&quot;(old), &quot;r&quot;(new)
+    : &quot;r&quot;(old), &quot;r&quot;(new)
     :
-    : &quot;volatile&quot;, &quot;alignstack&quot;
+    : &quot;alignstack&quot;
     );
 }
 
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
-    runtime.spawn(|| {
-        println!(&quot;THREAD 1 STARTING&quot;);
-        let id = 1;
-        for i in 0..10 {
-            println!(&quot;thread: {} counter: {}&quot;, id, i);
-            yield_thread();
-        }
-        println!(&quot;THREAD 1 FINISHED&quot;);
+    Runtime::spawn(|| {
+        println!(&quot;I haven't implemented a timer in this example.&quot;);
+        yield_thread();
+        println!(&quot;Finally, notice how the tasks are executed concurrently.&quot;);
     });
-    runtime.spawn(|| {
-        println!(&quot;THREAD 2 STARTING&quot;);
-        let id = 2;
-        for i in 0..15 {
-            println!(&quot;thread: {} counter: {}&quot;, id, i);
-            yield_thread();
-        }
-        println!(&quot;THREAD 2 FINISHED&quot;);
+    Runtime::spawn(|| {
+        println!(&quot;But we can still nest tasks...&quot;);
+        Runtime::spawn(|| {
+            println!(&quot;...like this!&quot;);
+        })
     });
     runtime.run();
 }
+
 </code></pre></pre>
-<h3><a class="header" href="#callback-based-approach" id="callback-based-approach">Callback based approach</a></h3>
-<p>You probably already know this from Javascript since it's extremely common.
-The whole idea behind a callback based approach is to save a pointer to a
-set of instructions we want to run later on.</p>
+<p>Still hanging in there? Good. Don't get frustrated if the code above is
+difficult to understand. If I hadn't written it myself I would probably feel
+the same. You can always go back and read the book which explains it later.</p>
+<h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
+<p>You probably already know what we're going to talk about in the next paragraphs
+from Javascript which I assume most know. If your exposure to Javascript has
+given you any sorts of PTSD earlier in life, close your eyes now and scroll down
+for 2-3 seconds. You'll find a link there that takes you to safety.</p>
+<p>The whole idea behind a callback based approach is to save a pointer to a set of
+instructions we want to run later. We can save that pointer on the stack before
+we yield control to the runtime, or in some sort of collection as we do below.</p>
 <p>The basic idea of not involving threads as a primary way to achieve concurrency
 is the common denominator for the rest of the approaches. Including the one
 Rust uses today which we'll soon get to.</p>
@@ -470,8 +506,10 @@ Rust uses today which we'll soon get to.</p>
 <p><strong>Drawbacks:</strong></p>
 <ul>
 <li>Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of callbacks in a task.</li>
+linearly with the number of callbacks in a chain of computations.</li>
 <li>Can be hard to reason about, many people already know this as as &quot;callback hell&quot;.</li>
+<li>It's a very different way of writing a program, and it can be difficult to
+get an understanding of the program flow.</li>
 <li>Sharing state between tasks is a hard problem in Rust using this approach due
 to it's ownership model.</li>
 </ul>
@@ -552,22 +590,23 @@ same thread using this example. The OS threads we create are basically just used
 as timers.</p>
 <h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
 <p>You might start to wonder by now, when are we going to talk about Futures?</p>
-<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and <code>deferreds</code> are 
-often used interchangeably in day to day jargon. There are some formal
-differences between which is used which we'll not cover here but it's worth
-explaining promises a bit as a segway to Rusts Futures.</p>
+<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and other names for
+deferred computations are often used interchangeably. There are formal
+differences between them but we'll not cover that here but it's worth
+explaining <code>promises</code> a bit since they're widely known due to beeing used in
+Javascript and will serve as segway to Rusts Futures.</p>
 <p>First of all, many languages has a concept of promises but I'll use the ones
-from Javascript as an example.</p>
+from Javascript in the examples below.</p>
 <p>Promises is one way to deal with the complexity which comes with a callback
 based approach.</p>
 <p>Instead of:</p>
 <pre><code class="language-js ignore">setTimer(200, () =&gt; {
-    setTimer(100, () =&gt; {
-        setTimer(50, () =&gt; {
-            console.log(&quot;I'm the last one&quot;);
-        })
-    })
-})
+  setTimer(100, () =&gt; {
+    setTimer(50, () =&gt; {
+      console.log(&quot;I'm the last one&quot;);
+    });
+  });
+});
 </code></pre>
 <p>We can to this:</p>
 <pre><code class="language-js ignore">function timer(ms) {
@@ -580,12 +619,11 @@ timer(200)
 .then(() =&gt; console.log(&quot;I'm the last one));
 </code></pre>
 <p>The change is even more substantial under the hood. You see, promises return
-a state which is either <code>pending</code>, <code>fulfilled</code> or <code>rejected</code>. So when we call
-<code>timer(200)</code> in the sample above, we get back a promise in the state <code>pending</code>.</p>
-<p>A <code>promise</code> is a state machine which makes one <code>step</code> when the I/O operation
-is finished.</p>
-<p>This allows for an even better syntax where we now can write our last example
-like this:</p>
+a state machine which can be in one of three states: <code>pending</code>, <code>fulfilled</code> or 
+<code>rejected</code>. So when we call <code>timer(200)</code> in the sample above, we get back a 
+promise in the state <code>pending</code>.</p>
+<p>Since promises are re-written as state machines they also enable an even better
+syntax where we now can write our last example like this:</p>
 <pre><code>async function run() {
     await timer(200);
     await timer(100);
@@ -593,12 +631,16 @@ like this:</p>
     console.log(&quot;I'm the last one&quot;);
 }
 </code></pre>
-<p>Now this is also where the similarities stop. The reason we went through all
-this is to get an introduction and get into the right mindset for exploring
-Rusts Futures.</p>
-<p>Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
-promises example above, and Rusts Futures 3.0 is a lot like async/await
-in our last example.</p>
+<p>You can consider the <code>run</code> function a <em>pausable</em> task consisting of several
+sub-tasks. On each &quot;await&quot; point it yields control to the scheduler (in this
+case it's the well known Javascript event loop). Once one of the sub-tasks changes
+state to either <code>fulfilled</code> or <code>rejected</code> the task is sheduled to continue to
+the next step.</p>
+<p>Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
+Rusts Futures 3.0 is a lot like async/await in our last example.</p>
+<p>Now this is also where the similarities with Rusts Futures stop. The reason we 
+go through all this is to get an introduction and get into the right mindset for
+exploring Rusts Futures.</p>
 <blockquote>
 <p>To avoid confusion later on: There is one difference you should know. Javascript
 promises are <em>eagerly</em> evaluated. That means that once it's created, it starts
@@ -617,7 +659,7 @@ need to be polled once before they do any work. You'll see in a moment.</p>
                         
 
                         
-                            <a rel="next" href="1_background_information.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next" href="1_futures_in_rust.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                 <i class="fa fa-angle-right"></i>
                             </a>
                         
@@ -635,7 +677,7 @@ need to be polled once before they do any work. You'll see in a moment.</p>
                 
 
                 
-                    <a href="1_background_information.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a href="1_futures_in_rust.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                         <i class="fa fa-angle-right"></i>
                     </a>
                 
diff --git a/book/1_background_information.html b/book/1_futures_in_rust.html
similarity index 93%
rename from book/1_background_information.html
rename to book/1_futures_in_rust.html
index 5ff356e..ee995f2 100644
--- a/book/1_background_information.html
+++ b/book/1_futures_in_rust.html
@@ -3,7 +3,7 @@
     <head>
         <!-- Book generated using mdBook -->
         <meta charset="UTF-8">
-        <title>Some background information - Futures Explained in 200 Lines of Rust</title>
+        <title>Futures in Rust - Futures Explained in 200 Lines of Rust</title>
         
 
         <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html" class="active"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html" class="active"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -149,7 +149,7 @@
 
                 <div id="content" class="content">
                     <main>
-                        <h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
+                        <h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
 <ul>
@@ -279,7 +279,7 @@ it needs to be, so go on and read these chapters if you feel a bit unsure. </p>
                     <nav class="nav-wrapper" aria-label="Page navigation">
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-                            <a rel="prev" href="1_why_futures.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="0_background_information.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
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@@ -297,7 +297,7 @@ it needs to be, so go on and read these chapters if you feel a bit unsure. </p>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
                 
-                    <a href="1_why_futures.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a href="0_background_information.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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diff --git a/book/2_waker_context.html b/book/2_waker_context.html
index e54a7ff..e118056 100644
--- a/book/2_waker_context.html
+++ b/book/2_waker_context.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html" class="active"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html" class="active"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -315,7 +315,7 @@ use purely global functions and state, or any other way you wish.</p>
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
                         
-                            <a rel="prev" href="1_background_information.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="1_futures_in_rust.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
                             </a>
                         
@@ -333,7 +333,7 @@ use purely global functions and state, or any other way you wish.</p>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
                 
-                    <a href="1_background_information.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a href="1_futures_in_rust.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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diff --git a/book/3_generators_pin.html b/book/3_generators_pin.html
index 8fb1655..afcf357 100644
--- a/book/3_generators_pin.html
+++ b/book/3_generators_pin.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html" class="active"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html" class="active"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
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         </nav>
diff --git a/book/4_pin.html b/book/4_pin.html
index ca3c547..ca1da2b 100644
--- a/book/4_pin.html
+++ b/book/4_pin.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html" class="active"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html" class="active"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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         </nav>
diff --git a/book/6_future_example.html b/book/6_future_example.html
index 1ce0fbb..681ef90 100644
--- a/book/6_future_example.html
+++ b/book/6_future_example.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html" class="active"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html" class="active"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
diff --git a/book/8_finished_example.html b/book/8_finished_example.html
index 0ffe14b..82a85d6 100644
--- a/book/8_finished_example.html
+++ b/book/8_finished_example.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html" class="active"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html" class="active"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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diff --git a/book/conclusion.html b/book/conclusion.html
index 77934fa..9c3ecd7 100644
--- a/book/conclusion.html
+++ b/book/conclusion.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html" class="active">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html" class="active">Conclusion and exercises</a></li></ol>
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diff --git a/book/index.html b/book/index.html
index b4ba48b..835b869 100644
--- a/book/index.html
+++ b/book/index.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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diff --git a/book/introduction.html b/book/introduction.html
index 62ed98e..f11c88c 100644
--- a/book/introduction.html
+++ b/book/introduction.html
@@ -78,7 +78,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html" class="active">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html" class="active">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
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             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -197,7 +197,7 @@ very well written and very helpful. So thanks!</p>
                         
 
                         
-                            <a rel="next" href="1_why_futures.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next" href="0_background_information.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                 <i class="fa fa-angle-right"></i>
                             </a>
                         
@@ -211,7 +211,7 @@ very well written and very helpful. So thanks!</p>
                 
 
                 
-                    <a href="1_why_futures.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a href="0_background_information.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                         <i class="fa fa-angle-right"></i>
                     </a>
                 
diff --git a/book/print.html b/book/print.html
index 5dfc819..b897ac3 100644
--- a/book/print.html
+++ b/book/print.html
@@ -80,7 +80,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="1_why_futures.html"><strong aria-hidden="true">1.</strong> Why Futures</a></li><li><a href="1_background_information.html"><strong aria-hidden="true">2.</strong> Some background information</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
+                <ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="0_background_information.html"><strong aria-hidden="true">1.</strong> Background information</a></li><li><a href="1_futures_in_rust.html"><strong aria-hidden="true">2.</strong> Futures in Rust</a></li><li><a href="2_waker_context.html"><strong aria-hidden="true">3.</strong> Waker and Context</a></li><li><a href="3_generators_pin.html"><strong aria-hidden="true">4.</strong> Generators</a></li><li><a href="4_pin.html"><strong aria-hidden="true">5.</strong> Pin</a></li><li><a href="6_future_example.html"><strong aria-hidden="true">6.</strong> Futures - our main example</a></li><li><a href="8_finished_example.html"><strong aria-hidden="true">7.</strong> Finished example (editable)</a></li><li class="affix"><a href="conclusion.html">Conclusion and exercises</a></li></ol>
             </div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
         </nav>
@@ -191,14 +191,22 @@ explore further and try your own ideas.</p>
 <code>async_std</code>, <code>Futures</code>, <code>libc</code>, <code>crossbeam</code> and many other libraries which so
 much is built upon.  Even the RFCs that much of the design is built upon is 
 very well written and very helpful. So thanks!</p>
-<h1><a class="header" href="#why-futures" id="why-futures">Why Futures</a></h1>
+<h1><a class="header" href="#some-background-information" id="some-background-information">Some Background Information</a></h1>
 <p>Before we go into the details about Futures in Rust, let's take a quick look
 at the alternatives for handling concurrent programming in general and some
 pros and cons for each of them.</p>
+<p>While we do that we'll get some information on concurrency which will make it
+easier for us when we dive in to Futures specifically.</p>
+<blockquote>
+<p>For fun, I've added a small snipped of runnable code with most of the examples.
+If you're like me, things get way more interesting then and maybe you'll se some
+things you haven't seen before along the way.</p>
+</blockquote>
 <h2><a class="header" href="#threads-provided-by-the-operating-system" id="threads-provided-by-the-operating-system">Threads provided by the operating system</a></h2>
-<p>Now one way of accomplishing this is letting the OS take care of everything for 
+<p>Now, one way of accomplishing this is letting the OS take care of everything for
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.</p>
+<p>The runtime we use to handle concurrency for us is the operating system itself.</p>
 <p><strong>Advantages:</strong></p>
 <ul>
 <li>Simple</li>
@@ -210,14 +218,14 @@ accomplish and write code like we normally would.</p>
 <ul>
 <li>OS level threads come with a rather large stack. If you have many tasks
 waiting simultaneously (like you would in a web-server under heavy load) you'll
-run out of memory pretty soon.</li>
+run out of memory pretty fast.</li>
 <li>There are a lot of syscalls involved. This can be pretty costly when the number
 of tasks is high.</li>
 <li>The OS has many things it needs to handle. It might not switch back to your
 thread as fast as you'd wish.</li>
 <li>Might not be an option on some systems</li>
 </ul>
-<p>Using OS threads in Rust looks like this:</p>
+<p><strong>Using OS threads in Rust looks like this:</strong></p>
 <pre><pre class="playpen"><code class="language-rust">use std::thread;
 
 fn main() {
@@ -245,18 +253,20 @@ fn main() {
 <p>OS threads sure has some pretty big advantages. So why all this talk about
 &quot;async&quot; and concurrency in the first place?</p>
 <p>First of all. For computers to be <a href="https://en.wikipedia.org/wiki/Efficiency"><em>efficient</em></a> it needs to multitask. Once you
-start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>) 
+start to look under the covers (like <a href="https://os.phil-opp.com/async-await/">how an operating system works</a>)
 you'll see concurrency everywhere. It's very fundamental in everything we do.</p>
 <p>Secondly, we have the web. Webservers is all about I/O and handling small tasks
 (requests). When the number of small tasks is large it's not a good fit for OS
 threads as of today because of the memory they require and the overhead involved
-when creating new threads. That's why you'll see so many async web frameworks
-and database drivers today.</p>
-<p>However, for a huge number of tasks, the standard OS threads will often be the
+when creating new threads. This gets even more relevant when the load is variable
+which means the current number of tasks a program has at any point in time is
+unpredictable. That's why you'll see so many async web frameworks and database
+drivers today.</p>
+<p>However, for a huge number of problems, the standard OS threads will often be the
 right solution. So, just think twice about your problem before you reach for an
 async library.</p>
 <p>Now, let's look at some other options for multitasking. They all have in common
-that they implement a way to do multitasking by implementing a &quot;userland&quot;
+that they implement a way to do multitasking by having a &quot;userland&quot;
 runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
 <p>Green threads has been popularized by GO in the recent years. Green threads
@@ -297,10 +307,12 @@ platforms.</li>
 <p>If you were to implement green threads in Rust, it could look something like
 this:</p>
 <blockquote>
-<p>The example presented below is from an earlier book I wrote about green
-threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
+<p>The example presented below is an adapted example from an earlier gitbook I
+wrote about green threads called <a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust.</a>
 If you want to know what's going on you'll find everything explained in detail
-in that book.</p>
+in that book. The code below is wildly unsafe and it's just to show a real example.
+It's not in any way meant to showcase &quot;best practice&quot;. Just so we're on
+the same page.</p>
 </blockquote>
 <pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
 #![feature(naked_functions)]
@@ -327,6 +339,7 @@ struct Thread {
     stack: Vec&lt;u8&gt;,
     ctx: ThreadContext,
     state: State,
+    task: Option&lt;Box&lt;dyn Fn()&gt;&gt;,
 }
 
 #[derive(Debug, Default)]
@@ -339,6 +352,7 @@ struct ThreadContext {
     r12: u64,
     rbx: u64,
     rbp: u64,
+    thread_ptr: u64,
 }
 
 impl Thread {
@@ -348,6 +362,7 @@ impl Thread {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Available,
+            task: None,
         }
     }
 }
@@ -359,11 +374,14 @@ impl Runtime {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Running,
+            task: None,
         };
 
         let mut threads = vec![base_thread];
+        threads[0].ctx.thread_ptr = &amp;threads[0] as *const Thread as u64;
         let mut available_threads: Vec&lt;Thread&gt; = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
         threads.append(&amp;mut available_threads);
+
         Runtime {
             threads,
             current: 0,
@@ -400,40 +418,56 @@ impl Runtime {
                 return false;
             }
         }
+        
         if self.threads[self.current].state != State::Available {
             self.threads[self.current].state = State::Ready;
         }
+
         self.threads[pos].state = State::Running;
         let old_pos = self.current;
         self.current = pos;
+
         unsafe {
             switch(&amp;mut self.threads[old_pos].ctx, &amp;self.threads[pos].ctx);
         }
-        self.threads.len() &gt; 0
+        true
     }
 
-    pub fn spawn(&amp;mut self, f: fn()) {
-        let available = self
-            .threads
-            .iter_mut()
-            .find(|t| t.state == State::Available)
-            .expect(&quot;no available thread.&quot;);
-        let size = available.stack.len();
+    pub fn spawn&lt;F: Fn() + 'static&gt;(f: F){
         unsafe {
-            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
-            let s_ptr = (s_ptr as usize &amp; !15) as *mut u8;
-            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
-            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
-            available.ctx.rsp = s_ptr.offset(-32) as u64;
+            let rt_ptr = RUNTIME as *mut Runtime;
+            let available = (*rt_ptr)
+                .threads
+                .iter_mut()
+                .find(|t| t.state == State::Available)
+                .expect(&quot;no available thread.&quot;);
+                
+            let size = available.stack.len();
+            let s_ptr = available.stack.as_mut_ptr();
+            available.task = Some(Box::new(f));
+            available.ctx.thread_ptr = available as *const Thread as u64;
+            ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64);
+            available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64;
+            available.state = State::Ready;
         }
-        available.state = State::Ready;
     }
 }
 
+fn call(thread: u64) {
+    let thread = unsafe { &amp;*(thread as *const Thread) };
+    if let Some(f) = &amp;thread.task {
+        f();
+    }
+}
+
+#[naked]
 fn guard() {
     unsafe {
         let rt_ptr = RUNTIME as *mut Runtime;
-        (*rt_ptr).t_return();
+        let rt = &amp;mut *rt_ptr;
+        println!(&quot;THREAD {} FINISHED.&quot;, rt.threads[rt.current].id);
+        rt.t_return();
     };
 }
 
@@ -455,7 +489,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     %r12, 0x20($0)
         mov     %rbx, 0x28($0)
         mov     %rbp, 0x30($0)
-   
+
         mov     0x00($1), %rsp
         mov     0x08($1), %r15
         mov     0x10($1), %r14
@@ -463,43 +497,45 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     0x20($1), %r12
         mov     0x28($1), %rbx
         mov     0x30($1), %rbp
+        mov     0x38($1), %rdi
         ret
         &quot;
     :
-    :&quot;r&quot;(old), &quot;r&quot;(new)
+    : &quot;r&quot;(old), &quot;r&quot;(new)
     :
-    : &quot;volatile&quot;, &quot;alignstack&quot;
+    : &quot;alignstack&quot;
     );
 }
 
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
-    runtime.spawn(|| {
-        println!(&quot;THREAD 1 STARTING&quot;);
-        let id = 1;
-        for i in 0..10 {
-            println!(&quot;thread: {} counter: {}&quot;, id, i);
-            yield_thread();
-        }
-        println!(&quot;THREAD 1 FINISHED&quot;);
+    Runtime::spawn(|| {
+        println!(&quot;I haven't implemented a timer in this example.&quot;);
+        yield_thread();
+        println!(&quot;Finally, notice how the tasks are executed concurrently.&quot;);
     });
-    runtime.spawn(|| {
-        println!(&quot;THREAD 2 STARTING&quot;);
-        let id = 2;
-        for i in 0..15 {
-            println!(&quot;thread: {} counter: {}&quot;, id, i);
-            yield_thread();
-        }
-        println!(&quot;THREAD 2 FINISHED&quot;);
+    Runtime::spawn(|| {
+        println!(&quot;But we can still nest tasks...&quot;);
+        Runtime::spawn(|| {
+            println!(&quot;...like this!&quot;);
+        })
     });
     runtime.run();
 }
+
 </code></pre></pre>
-<h3><a class="header" href="#callback-based-approach" id="callback-based-approach">Callback based approach</a></h3>
-<p>You probably already know this from Javascript since it's extremely common.
-The whole idea behind a callback based approach is to save a pointer to a
-set of instructions we want to run later on.</p>
+<p>Still hanging in there? Good. Don't get frustrated if the code above is
+difficult to understand. If I hadn't written it myself I would probably feel
+the same. You can always go back and read the book which explains it later.</p>
+<h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
+<p>You probably already know what we're going to talk about in the next paragraphs
+from Javascript which I assume most know. If your exposure to Javascript has
+given you any sorts of PTSD earlier in life, close your eyes now and scroll down
+for 2-3 seconds. You'll find a link there that takes you to safety.</p>
+<p>The whole idea behind a callback based approach is to save a pointer to a set of
+instructions we want to run later. We can save that pointer on the stack before
+we yield control to the runtime, or in some sort of collection as we do below.</p>
 <p>The basic idea of not involving threads as a primary way to achieve concurrency
 is the common denominator for the rest of the approaches. Including the one
 Rust uses today which we'll soon get to.</p>
@@ -512,8 +548,10 @@ Rust uses today which we'll soon get to.</p>
 <p><strong>Drawbacks:</strong></p>
 <ul>
 <li>Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of callbacks in a task.</li>
+linearly with the number of callbacks in a chain of computations.</li>
 <li>Can be hard to reason about, many people already know this as as &quot;callback hell&quot;.</li>
+<li>It's a very different way of writing a program, and it can be difficult to
+get an understanding of the program flow.</li>
 <li>Sharing state between tasks is a hard problem in Rust using this approach due
 to it's ownership model.</li>
 </ul>
@@ -594,22 +632,23 @@ same thread using this example. The OS threads we create are basically just used
 as timers.</p>
 <h2><a class="header" href="#from-callbacks-to-promises" id="from-callbacks-to-promises">From callbacks to promises</a></h2>
 <p>You might start to wonder by now, when are we going to talk about Futures?</p>
-<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and <code>deferreds</code> are 
-often used interchangeably in day to day jargon. There are some formal
-differences between which is used which we'll not cover here but it's worth
-explaining promises a bit as a segway to Rusts Futures.</p>
+<p>Well, we're getting there. You see <code>promises</code>, <code>futures</code> and other names for
+deferred computations are often used interchangeably. There are formal
+differences between them but we'll not cover that here but it's worth
+explaining <code>promises</code> a bit since they're widely known due to beeing used in
+Javascript and will serve as segway to Rusts Futures.</p>
 <p>First of all, many languages has a concept of promises but I'll use the ones
-from Javascript as an example.</p>
+from Javascript in the examples below.</p>
 <p>Promises is one way to deal with the complexity which comes with a callback
 based approach.</p>
 <p>Instead of:</p>
 <pre><code class="language-js ignore">setTimer(200, () =&gt; {
-    setTimer(100, () =&gt; {
-        setTimer(50, () =&gt; {
-            console.log(&quot;I'm the last one&quot;);
-        })
-    })
-})
+  setTimer(100, () =&gt; {
+    setTimer(50, () =&gt; {
+      console.log(&quot;I'm the last one&quot;);
+    });
+  });
+});
 </code></pre>
 <p>We can to this:</p>
 <pre><code class="language-js ignore">function timer(ms) {
@@ -622,12 +661,11 @@ timer(200)
 .then(() =&gt; console.log(&quot;I'm the last one));
 </code></pre>
 <p>The change is even more substantial under the hood. You see, promises return
-a state which is either <code>pending</code>, <code>fulfilled</code> or <code>rejected</code>. So when we call
-<code>timer(200)</code> in the sample above, we get back a promise in the state <code>pending</code>.</p>
-<p>A <code>promise</code> is a state machine which makes one <code>step</code> when the I/O operation
-is finished.</p>
-<p>This allows for an even better syntax where we now can write our last example
-like this:</p>
+a state machine which can be in one of three states: <code>pending</code>, <code>fulfilled</code> or 
+<code>rejected</code>. So when we call <code>timer(200)</code> in the sample above, we get back a 
+promise in the state <code>pending</code>.</p>
+<p>Since promises are re-written as state machines they also enable an even better
+syntax where we now can write our last example like this:</p>
 <pre><code>async function run() {
     await timer(200);
     await timer(100);
@@ -635,19 +673,23 @@ like this:</p>
     console.log(&quot;I'm the last one&quot;);
 }
 </code></pre>
-<p>Now this is also where the similarities stop. The reason we went through all
-this is to get an introduction and get into the right mindset for exploring
-Rusts Futures.</p>
-<p>Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
-promises example above, and Rusts Futures 3.0 is a lot like async/await
-in our last example.</p>
+<p>You can consider the <code>run</code> function a <em>pausable</em> task consisting of several
+sub-tasks. On each &quot;await&quot; point it yields control to the scheduler (in this
+case it's the well known Javascript event loop). Once one of the sub-tasks changes
+state to either <code>fulfilled</code> or <code>rejected</code> the task is sheduled to continue to
+the next step.</p>
+<p>Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
+Rusts Futures 3.0 is a lot like async/await in our last example.</p>
+<p>Now this is also where the similarities with Rusts Futures stop. The reason we 
+go through all this is to get an introduction and get into the right mindset for
+exploring Rusts Futures.</p>
 <blockquote>
 <p>To avoid confusion later on: There is one difference you should know. Javascript
 promises are <em>eagerly</em> evaluated. That means that once it's created, it starts
 running a task. Rusts Futures on the other hand is <em>lazily</em> evaluated. They
 need to be polled once before they do any work. You'll see in a moment.</p>
 </blockquote>
-<h1><a class="header" href="#some-background-information" id="some-background-information">Some background information</a></h1>
+<h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
 <blockquote>
 <p><strong>Relevant for:</strong></p>
 <ul>
@@ -1724,7 +1766,7 @@ extra care must be taken when implementing <code>Drop</code> for pinned types.</
 <h2><a class="header" href="#putting-it-all-together" id="putting-it-all-together">Putting it all together</a></h2>
 <p>This is exactly what we'll do when we implement our own <code>Futures</code> stay tuned, 
 we're soon finished.</p>
-<h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
+<h1><a class="header" href="#futures-in-rust-1" id="futures-in-rust-1">Futures in Rust</a></h1>
 <p>We'll create our own <code>Futures</code> together with a fake reactor and a simple
 executor which allows you to edit, run an play around with the code right here
 in your browser.</p>
diff --git a/book/searchindex.js b/book/searchindex.js
index 351c70e..752aee9 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of tasks, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by implementing a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a task. Can be hard to reason about, many people already know this as as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and deferreds are often used interchangeably in day to day jargon. There are some formal differences between which is used which we'll not cover here but it's worth explaining promises a bit as a segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript as an example. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }) })\n}) We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state which is either pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. A promise is a state machine which makes one step when the I/O operation is finished. This allows for an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} Now this is also where the similarities stop. The reason we went through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the promises example above, and Rusts Futures 3.0 is a lot like async/await in our last example. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them.","breadcrumbs":"Why Futures","id":"3","title":"Why Futures"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty soon. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of tasks, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by implementing a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is from an earlier book I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, }; let mut threads = vec![base_thread]; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } self.threads.len() > 0 } pub fn spawn(&mut self, f: fn()) { let available = self .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); unsafe { let s_ptr = available.stack.as_mut_ptr().offset(size as isize); let s_ptr = (s_ptr as usize & !15) as *mut u8; ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64); ptr::write(s_ptr.offset(-32) as *mut u64, f as u64); available.ctx.rsp = s_ptr.offset(-32) as u64; } available.state = State::Ready; }\n} fn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp ret \" : :\"r\"(old), \"r\"(new) : : \"volatile\", \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); runtime.spawn(|| { println!(\"THREAD 1 STARTING\"); let id = 1; for i in 0..10 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 1 FINISHED\"); }); runtime.spawn(|| { println!(\"THREAD 2 STARTING\"); let id = 2; for i in 0..15 { println!(\"thread: {} counter: {}\", id, i); yield_thread(); } println!(\"THREAD 2 FINISHED\"); }); runtime.run();\n}","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know this from Javascript since it's extremely common. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later on. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a task. Can be hard to reason about, many people already know this as as \"callback hell\". Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approach","id":"6","title":"Callback based approach"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and deferreds are often used interchangeably in day to day jargon. There are some formal differences between which is used which we'll not cover here but it's worth explaining promises a bit as a segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript as an example. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }) })\n}) We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state which is either pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. A promise is a state machine which makes one step when the I/O operation is finished. This allows for an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} Now this is also where the similarities stop. The reason we went through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the promises example above, and Rusts Futures 3.0 is a lot like async/await in our last example. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Some background information","id":"8","title":"Some background information"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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diff --git a/src/1_why_futures.md b/src/0_background_information.md
similarity index 62%
rename from src/1_why_futures.md
rename to src/0_background_information.md
index 4f37161..5dddf72 100644
--- a/src/1_why_futures.md
+++ b/src/0_background_information.md
@@ -1,15 +1,24 @@
-# Why Futures
+# Some Background Information
 
 Before we go into the details about Futures in Rust, let's take a quick look
 at the alternatives for handling concurrent programming in general and some
 pros and cons for each of them.
 
+While we do that we'll get some information on concurrency which will make it
+easier for us when we dive in to Futures specifically.
+
+> For fun, I've added a small snipped of runnable code with most of the examples.
+> If you're like me, things get way more interesting then and maybe you'll se some
+> things you haven't seen before along the way.
+
 ## Threads provided by the operating system
 
-Now one way of accomplishing this is letting the OS take care of everything for 
+Now, one way of accomplishing this is letting the OS take care of everything for
 us. We do this by simply spawning a new OS thread for each task we want to
 accomplish and write code like we normally would.
 
+The runtime we use to handle concurrency for us is the operating system itself.
+
 **Advantages:**
 
 - Simple
@@ -20,15 +29,15 @@ accomplish and write code like we normally would.
 **Drawbacks:**
 
 - OS level threads come with a rather large stack. If you have many tasks
-waiting simultaneously (like you would in a web-server under heavy load) you'll
-run out of memory pretty soon.
+  waiting simultaneously (like you would in a web-server under heavy load) you'll
+  run out of memory pretty fast.
 - There are a lot of syscalls involved. This can be pretty costly when the number
-of tasks is high.
+  of tasks is high.
 - The OS has many things it needs to handle. It might not switch back to your
-thread as fast as you'd wish.
+  thread as fast as you'd wish.
 - Might not be an option on some systems
 
-Using OS threads in Rust looks like this:
+**Using OS threads in Rust looks like this:**
 
 ```rust
 use std::thread;
@@ -60,21 +69,23 @@ OS threads sure has some pretty big advantages. So why all this talk about
 "async" and concurrency in the first place?
 
 First of all. For computers to be [_efficient_](https://en.wikipedia.org/wiki/Efficiency) it needs to multitask. Once you
-start to look under the covers (like [how an operating system works](https://os.phil-opp.com/async-await/)) 
+start to look under the covers (like [how an operating system works](https://os.phil-opp.com/async-await/))
 you'll see concurrency everywhere. It's very fundamental in everything we do.
 
 Secondly, we have the web. Webservers is all about I/O and handling small tasks
 (requests). When the number of small tasks is large it's not a good fit for OS
 threads as of today because of the memory they require and the overhead involved
-when creating new threads. That's why you'll see so many async web frameworks
-and database drivers today.
+when creating new threads. This gets even more relevant when the load is variable
+which means the current number of tasks a program has at any point in time is
+unpredictable. That's why you'll see so many async web frameworks and database
+drivers today.
 
-However, for a huge number of tasks, the standard OS threads will often be the
+However, for a huge number of problems, the standard OS threads will often be the
 right solution. So, just think twice about your problem before you reach for an
 async library.
 
 Now, let's look at some other options for multitasking. They all have in common
-that they implement a way to do multitasking by implementing a "userland"
+that they implement a way to do multitasking by having a "userland"
 runtime:
 
 ## Green threads
@@ -91,9 +102,9 @@ The typical flow will be like this:
 1. Run som non-blocking code
 2. Make a blocking call to some external resource
 3. CPU jumps to the "main" thread which schedules a different thread to run and
-"jumps" to that stack
+   "jumps" to that stack
 4. Run some non-blocking code on the new thread until a new blocking call or the
-task is finished
+   task is finished
 5. "jumps" back to the "main" thread and so on
 
 These "jumps" are know as context switches. Your OS is doing it many times each
@@ -104,26 +115,28 @@ second as you read this.
 1. Simple to use. The code will look like it does when using OS threads.
 2. A "context switch" is reasonably fast
 3. Each stack only gets a little memory to start with so you can have hundred of
-thousands of green threads running.
+   thousands of green threads running.
 4. It's easy to incorporate [_preemtion_](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/green-threads#preemptive-multitasking)
-which puts a lot of control in the hands of the runtime implementors.
+   which puts a lot of control in the hands of the runtime implementors.
 
 **Drawbacks:**
 
 1. The stacks might need to grow. Solving this is not easy and will have a cost.
 2. You need to save all the CPU state on every switch
 3. It's not a _zero cost abstraction_ (Rust had green threads early on and this
-was one of the reasons they were removed).
-1. Complicated to implement correctly if you want to support many different
-platforms.
+   was one of the reasons they were removed).
+4. Complicated to implement correctly if you want to support many different
+   platforms.
 
 If you were to implement green threads in Rust, it could look something like
 this:
 
->The example presented below is from an earlier book I wrote about green
->threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
->If you want to know what's going on you'll find everything explained in detail
->in that book.
+> The example presented below is an adapted example from an earlier gitbook I
+> wrote about green threads called [Green Threads Explained in 200 lines of Rust.](https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/)
+> If you want to know what's going on you'll find everything explained in detail
+> in that book. The code below is wildly unsafe and it's just to show a real example.
+> It's not in any way meant to showcase "best practice". Just so we're on
+> the same page.
 
 ```rust
 #![feature(asm)]
@@ -151,6 +164,7 @@ struct Thread {
     stack: Vec<u8>,
     ctx: ThreadContext,
     state: State,
+    task: Option<Box<dyn Fn()>>,
 }
 
 #[derive(Debug, Default)]
@@ -163,6 +177,7 @@ struct ThreadContext {
     r12: u64,
     rbx: u64,
     rbp: u64,
+    thread_ptr: u64,
 }
 
 impl Thread {
@@ -172,6 +187,7 @@ impl Thread {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Available,
+            task: None,
         }
     }
 }
@@ -183,11 +199,14 @@ impl Runtime {
             stack: vec![0_u8; DEFAULT_STACK_SIZE],
             ctx: ThreadContext::default(),
             state: State::Running,
+            task: None,
         };
 
         let mut threads = vec![base_thread];
+        threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64;
         let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect();
         threads.append(&mut available_threads);
+
         Runtime {
             threads,
             current: 0,
@@ -224,40 +243,56 @@ impl Runtime {
                 return false;
             }
         }
+        
         if self.threads[self.current].state != State::Available {
             self.threads[self.current].state = State::Ready;
         }
+
         self.threads[pos].state = State::Running;
         let old_pos = self.current;
         self.current = pos;
+
         unsafe {
             switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx);
         }
-        self.threads.len() > 0
+        true
     }
 
-    pub fn spawn(&mut self, f: fn()) {
-        let available = self
-            .threads
-            .iter_mut()
-            .find(|t| t.state == State::Available)
-            .expect("no available thread.");
-        let size = available.stack.len();
+    pub fn spawn<F: Fn() + 'static>(f: F){
         unsafe {
-            let s_ptr = available.stack.as_mut_ptr().offset(size as isize);
-            let s_ptr = (s_ptr as usize & !15) as *mut u8;
-            ptr::write(s_ptr.offset(-24) as *mut u64, guard as u64);
-            ptr::write(s_ptr.offset(-32) as *mut u64, f as u64);
-            available.ctx.rsp = s_ptr.offset(-32) as u64;
+            let rt_ptr = RUNTIME as *mut Runtime;
+            let available = (*rt_ptr)
+                .threads
+                .iter_mut()
+                .find(|t| t.state == State::Available)
+                .expect("no available thread.");
+                
+            let size = available.stack.len();
+            let s_ptr = available.stack.as_mut_ptr();
+            available.task = Some(Box::new(f));
+            available.ctx.thread_ptr = available as *const Thread as u64;
+            ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64);
+            ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64);
+            available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64;
+            available.state = State::Ready;
         }
-        available.state = State::Ready;
     }
 }
 
+fn call(thread: u64) {
+    let thread = unsafe { &*(thread as *const Thread) };
+    if let Some(f) = &thread.task {
+        f();
+    }
+}
+
+#[naked]
 fn guard() {
     unsafe {
         let rt_ptr = RUNTIME as *mut Runtime;
-        (*rt_ptr).t_return();
+        let rt = &mut *rt_ptr;
+        println!("THREAD {} FINISHED.", rt.threads[rt.current].id);
+        rt.t_return();
     };
 }
 
@@ -279,7 +314,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     %r12, 0x20($0)
         mov     %rbx, 0x28($0)
         mov     %rbp, 0x30($0)
-   
+
         mov     0x00($1), %rsp
         mov     0x08($1), %r15
         mov     0x10($1), %r14
@@ -287,45 +322,49 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
         mov     0x20($1), %r12
         mov     0x28($1), %rbx
         mov     0x30($1), %rbp
+        mov     0x38($1), %rdi
         ret
         "
     :
-    :"r"(old), "r"(new)
+    : "r"(old), "r"(new)
     :
-    : "volatile", "alignstack"
+    : "alignstack"
     );
 }
 
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
-    runtime.spawn(|| {
-        println!("THREAD 1 STARTING");
-        let id = 1;
-        for i in 0..10 {
-            println!("thread: {} counter: {}", id, i);
-            yield_thread();
-        }
-        println!("THREAD 1 FINISHED");
+    Runtime::spawn(|| {
+        println!("I haven't implemented a timer in this example.");
+        yield_thread();
+        println!("Finally, notice how the tasks are executed concurrently.");
     });
-    runtime.spawn(|| {
-        println!("THREAD 2 STARTING");
-        let id = 2;
-        for i in 0..15 {
-            println!("thread: {} counter: {}", id, i);
-            yield_thread();
-        }
-        println!("THREAD 2 FINISHED");
+    Runtime::spawn(|| {
+        println!("But we can still nest tasks...");
+        Runtime::spawn(|| {
+            println!("...like this!");
+        })
     });
     runtime.run();
 }
+
 ```
 
-### Callback based approach
+Still hanging in there? Good. Don't get frustrated if the code above is
+difficult to understand. If I hadn't written it myself I would probably feel
+the same. You can always go back and read the book which explains it later.
 
-You probably already know this from Javascript since it's extremely common.
-The whole idea behind a callback based approach is to save a pointer to a
-set of instructions we want to run later on.
+### Callback based approaches
+
+You probably already know what we're going to talk about in the next paragraphs
+from Javascript which I assume most know. If your exposure to Javascript has
+given you any sorts of PTSD earlier in life, close your eyes now and scroll down
+for 2-3 seconds. You'll find a link there that takes you to safety.
+
+The whole idea behind a callback based approach is to save a pointer to a set of
+instructions we want to run later. We can save that pointer on the stack before
+we yield control to the runtime, or in some sort of collection as we do below.
 
 The basic idea of not involving threads as a primary way to achieve concurrency
 is the common denominator for the rest of the approaches. Including the one
@@ -340,10 +379,12 @@ Rust uses today which we'll soon get to.
 **Drawbacks:**
 
 - Each task must save the state it needs for later, the memory usage will grow
-linearly with the number of callbacks in a task.
+  linearly with the number of callbacks in a chain of computations.
 - Can be hard to reason about, many people already know this as as "callback hell".
+- It's a very different way of writing a program, and it can be difficult to
+get an understanding of the program flow.
 - Sharing state between tasks is a hard problem in Rust using this approach due
-to it's ownership model.
+  to it's ownership model.
 
 An extremely simplified example of a how a callback based approach could look
 like is:
@@ -428,13 +469,14 @@ as timers.
 
 You might start to wonder by now, when are we going to talk about Futures?
 
-Well, we're getting there. You see `promises`, `futures` and `deferreds` are 
-often used interchangeably in day to day jargon. There are some formal
-differences between which is used which we'll not cover here but it's worth
-explaining promises a bit as a segway to Rusts Futures.
+Well, we're getting there. You see `promises`, `futures` and other names for
+deferred computations are often used interchangeably. There are formal
+differences between them but we'll not cover that here but it's worth
+explaining `promises` a bit since they're widely known due to beeing used in
+Javascript and will serve as segway to Rusts Futures.
 
 First of all, many languages has a concept of promises but I'll use the ones
-from Javascript as an example.
+from Javascript in the examples below.
 
 Promises is one way to deal with the complexity which comes with a callback
 based approach.
@@ -443,12 +485,12 @@ Instead of:
 
 ```js, ignore
 setTimer(200, () => {
-    setTimer(100, () => {
-        setTimer(50, () => {
-            console.log("I'm the last one");
-        })
-    })
-})
+  setTimer(100, () => {
+    setTimer(50, () => {
+      console.log("I'm the last one");
+    });
+  });
+});
 ```
 
 We can to this:
@@ -465,14 +507,12 @@ timer(200)
 ```
 
 The change is even more substantial under the hood. You see, promises return
-a state which is either `pending`, `fulfilled` or `rejected`. So when we call
-`timer(200)` in the sample above, we get back a promise in the state `pending`.
+a state machine which can be in one of three states: `pending`, `fulfilled` or 
+`rejected`. So when we call `timer(200)` in the sample above, we get back a 
+promise in the state `pending`.
 
-A `promise` is a state machine which makes one `step` when the I/O operation
-is finished.
-
-This allows for an even better syntax where we now can write our last example
-like this:
+Since promises are re-written as state machines they also enable an even better
+syntax where we now can write our last example like this:
 
 ```
 async function run() {
@@ -483,15 +523,22 @@ async function run() {
 }
 ```
 
-Now this is also where the similarities stop. The reason we went through all
-this is to get an introduction and get into the right mindset for exploring
-Rusts Futures.
+You can consider the `run` function a _pausable_ task consisting of several
+sub-tasks. On each "await" point it yields control to the scheduler (in this
+case it's the well known Javascript event loop). Once one of the sub-tasks changes
+state to either `fulfilled` or `rejected` the task is sheduled to continue to
+the next step.
 
-Syntactically though, this is relevant. Rusts Futures 1.0 was a lot like the
-promises example above, and Rusts Futures 3.0 is a lot like async/await
-in our last example.
+Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
+Rusts Futures 3.0 is a lot like async/await in our last example.
 
->To avoid confusion later on: There is one difference you should know. Javascript
->promises are _eagerly_ evaluated. That means that once it's created, it starts
->running a task. Rusts Futures on the other hand is _lazily_ evaluated. They
->need to be polled once before they do any work. You'll see in a moment.
\ No newline at end of file
+Now this is also where the similarities with Rusts Futures stop. The reason we 
+go through all this is to get an introduction and get into the right mindset for
+exploring Rusts Futures.
+
+
+
+> To avoid confusion later on: There is one difference you should know. Javascript
+> promises are _eagerly_ evaluated. That means that once it's created, it starts
+> running a task. Rusts Futures on the other hand is _lazily_ evaluated. They
+> need to be polled once before they do any work. You'll see in a moment.
diff --git a/src/1_background_information.md b/src/1_futures_in_rust.md
similarity index 98%
rename from src/1_background_information.md
rename to src/1_futures_in_rust.md
index 1ad05c7..1ab2d54 100644
--- a/src/1_background_information.md
+++ b/src/1_futures_in_rust.md
@@ -1,4 +1,4 @@
-# Some background information
+# Futures in Rust
 
 > **Relevant for:**
 >
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index f7bb8ad..4970fdf 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -2,8 +2,8 @@
 
 [Introduction](./introduction.md)
 
-- [Why Futures](./1_why_futures.md)
-- [Some background information](./1_background_information.md)
+- [Background information](./0_background_information.md)
+- [Futures in Rust](./1_futures_in_rust.md)
 - [Waker and Context](./2_waker_context.md)
 - [Generators](./3_generators_pin.md)
 - [Pin](./4_pin.md)

From 971288868b54916bc8cdcf7c4dc3686745df3757 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sun, 5 Apr 2020 00:07:14 +0200
Subject: [PATCH 07/10] formatting

---
 book/0_background_information.html | 14 ++++++++++----
 book/1_futures_in_rust.html        |  6 +-----
 book/print.html                    | 20 +++++++++++---------
 book/searchindex.js                |  2 +-
 book/searchindex.json              |  2 +-
 src/0_background_information.md    | 13 ++++++++++---
 src/1_futures_in_rust.md           |  8 +-------
 7 files changed, 35 insertions(+), 30 deletions(-)

diff --git a/book/0_background_information.html b/book/0_background_information.html
index 45b4ae7..e319662 100644
--- a/book/0_background_information.html
+++ b/book/0_background_information.html
@@ -488,9 +488,12 @@ difficult to understand. If I hadn't written it myself I would probably feel
 the same. You can always go back and read the book which explains it later.</p>
 <h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
 <p>You probably already know what we're going to talk about in the next paragraphs
-from Javascript which I assume most know. If your exposure to Javascript has
-given you any sorts of PTSD earlier in life, close your eyes now and scroll down
-for 2-3 seconds. You'll find a link there that takes you to safety.</p>
+from Javascript which I assume most know. </p>
+<blockquote>
+<p>If your exposure to Javascript has given you any sorts of PTSD earlier in life,
+close your eyes now and scroll down for 2-3 seconds. You'll find a link there
+that takes you to safety.</p>
+</blockquote>
 <p>The whole idea behind a callback based approach is to save a pointer to a set of
 instructions we want to run later. We can save that pointer on the stack before
 we yield control to the runtime, or in some sort of collection as we do below.</p>
@@ -647,7 +650,10 @@ promises are <em>eagerly</em> evaluated. That means that once it's created, it s
 running a task. Rusts Futures on the other hand is <em>lazily</em> evaluated. They
 need to be polled once before they do any work. You'll see in a moment.</p>
 </blockquote>
-
+<br />
+<div style="text-align: center;  padding-top: 2em;"> 
+<a href="/1_futures_in_rust.html" style="background: red; color: white; padding:2em 2em 2em 2em; font-size: 1.2em;"><strong>PANIC BUTTON (next chapter)</strong></a>
+</div>
                     </main>
 
                     <nav class="nav-wrapper" aria-label="Page navigation">
diff --git a/book/1_futures_in_rust.html b/book/1_futures_in_rust.html
index ee995f2..449de53 100644
--- a/book/1_futures_in_rust.html
+++ b/book/1_futures_in_rust.html
@@ -151,7 +151,7 @@
                     <main>
                         <h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
 <li>High level introduction to concurrency in Rust</li>
 <li>Knowing what Rust provides and not when working with async code</li>
@@ -159,10 +159,6 @@
 <li>Getting pointers to further reading on concurrency in general</li>
 </ul>
 </blockquote>
-<p>Before we start implementing our <code>Futures</code> , we'll go through some background
-information that will help demystify some of the concepts we encounter.</p>
-<p>Actually, after going through these concepts, implementing futures will seem
-pretty simple. I promise.</p>
 <h2><a class="header" href="#futures" id="futures">Futures</a></h2>
 <p>So what is a future?</p>
 <p>A future is a representation of some operation which will complete in the
diff --git a/book/print.html b/book/print.html
index b897ac3..cf46bae 100644
--- a/book/print.html
+++ b/book/print.html
@@ -530,9 +530,12 @@ difficult to understand. If I hadn't written it myself I would probably feel
 the same. You can always go back and read the book which explains it later.</p>
 <h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
 <p>You probably already know what we're going to talk about in the next paragraphs
-from Javascript which I assume most know. If your exposure to Javascript has
-given you any sorts of PTSD earlier in life, close your eyes now and scroll down
-for 2-3 seconds. You'll find a link there that takes you to safety.</p>
+from Javascript which I assume most know. </p>
+<blockquote>
+<p>If your exposure to Javascript has given you any sorts of PTSD earlier in life,
+close your eyes now and scroll down for 2-3 seconds. You'll find a link there
+that takes you to safety.</p>
+</blockquote>
 <p>The whole idea behind a callback based approach is to save a pointer to a set of
 instructions we want to run later. We can save that pointer on the stack before
 we yield control to the runtime, or in some sort of collection as we do below.</p>
@@ -689,9 +692,12 @@ promises are <em>eagerly</em> evaluated. That means that once it's created, it s
 running a task. Rusts Futures on the other hand is <em>lazily</em> evaluated. They
 need to be polled once before they do any work. You'll see in a moment.</p>
 </blockquote>
-<h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
+<br />
+<div style="text-align: center;  padding-top: 2em;"> 
+<a href="/1_futures_in_rust.html" style="background: red; color: white; padding:2em 2em 2em 2em; font-size: 1.2em;"><strong>PANIC BUTTON (next chapter)</strong></a>
+</div><h1><a class="header" href="#futures-in-rust" id="futures-in-rust">Futures in Rust</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
 <li>High level introduction to concurrency in Rust</li>
 <li>Knowing what Rust provides and not when working with async code</li>
@@ -699,10 +705,6 @@ need to be polled once before they do any work. You'll see in a moment.</p>
 <li>Getting pointers to further reading on concurrency in general</li>
 </ul>
 </blockquote>
-<p>Before we start implementing our <code>Futures</code> , we'll go through some background
-information that will help demystify some of the concepts we encounter.</p>
-<p>Actually, after going through these concepts, implementing futures will seem
-pretty simple. I promise.</p>
 <h2><a class="header" href="#futures" id="futures">Futures</a></h2>
 <p>So what is a future?</p>
 <p>A future is a representation of some operation which will complete in the
diff --git a/book/searchindex.js b/book/searchindex.js
index 752aee9..39c5508 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. 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Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. 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As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. 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You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. 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Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment.","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Relevant for: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter. Actually, after going through these concepts, implementing futures will seem pretty simple. I promise.","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. 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It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. 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As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. 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Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. 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You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. 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Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. 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\ No newline at end of file
diff --git a/src/0_background_information.md b/src/0_background_information.md
index 5dddf72..6eddf3a 100644
--- a/src/0_background_information.md
+++ b/src/0_background_information.md
@@ -358,9 +358,11 @@ the same. You can always go back and read the book which explains it later.
 ### Callback based approaches
 
 You probably already know what we're going to talk about in the next paragraphs
-from Javascript which I assume most know. If your exposure to Javascript has
-given you any sorts of PTSD earlier in life, close your eyes now and scroll down
-for 2-3 seconds. You'll find a link there that takes you to safety.
+from Javascript which I assume most know. 
+
+>If your exposure to Javascript has given you any sorts of PTSD earlier in life,
+close your eyes now and scroll down for 2-3 seconds. You'll find a link there
+that takes you to safety.
 
 The whole idea behind a callback based approach is to save a pointer to a set of
 instructions we want to run later. We can save that pointer on the stack before
@@ -542,3 +544,8 @@ exploring Rusts Futures.
 > promises are _eagerly_ evaluated. That means that once it's created, it starts
 > running a task. Rusts Futures on the other hand is _lazily_ evaluated. They
 > need to be polled once before they do any work. You'll see in a moment.
+
+<br />
+<div style="text-align: center;  padding-top: 2em;"> 
+<a href="/1_futures_in_rust.html" style="background: red; color: white; padding:2em 2em 2em 2em; font-size: 1.2em;"><strong>PANIC BUTTON (next chapter)</strong></a>
+</div>
\ No newline at end of file
diff --git a/src/1_futures_in_rust.md b/src/1_futures_in_rust.md
index 1ab2d54..549ad65 100644
--- a/src/1_futures_in_rust.md
+++ b/src/1_futures_in_rust.md
@@ -1,18 +1,12 @@
 # Futures in Rust
 
-> **Relevant for:**
+> **Overview:**
 >
 > - High level introduction to concurrency in Rust
 > - Knowing what Rust provides and not when working with async code
 > - Understanding why we need a runtime-library in Rust
 > - Getting pointers to further reading on concurrency in general
 
-Before we start implementing our `Futures` , we'll go through some background
-information that will help demystify some of the concepts we encounter.
-
-Actually, after going through these concepts, implementing futures will seem
-pretty simple. I promise.
-
 ## Futures
 
 So what is a future?

From 5ec0336d66fbf7d5be3713e05e94968e4b357e87 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sun, 5 Apr 2020 01:01:56 +0200
Subject: [PATCH 08/10] making tests pass on windows

---
 book/0_background_information.html |  9 +++++----
 book/3_generators_pin.html         |  8 ++++----
 book/print.html                    | 17 +++++++++--------
 book/searchindex.js                |  2 +-
 book/searchindex.json              |  2 +-
 src/0_background_information.md    |  9 +++++----
 src/3_generators_pin.md            |  8 ++++----
 7 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/book/0_background_information.html b/book/0_background_information.html
index e319662..f9519fa 100644
--- a/book/0_background_information.html
+++ b/book/0_background_information.html
@@ -272,7 +272,7 @@ in that book. The code below is wildly unsafe and it's just to show a real examp
 It's not in any way meant to showcase &quot;best practice&quot;. Just so we're on
 the same page.</p>
 </blockquote>
-<pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
+<pre><pre class="playpen"><code class="language-rust edition2018">#![feature(asm)]
 #![feature(naked_functions)]
 use std::ptr;
 
@@ -464,7 +464,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
     : &quot;alignstack&quot;
     );
 }
-
+# #[cfg(not(windows))]
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
@@ -481,7 +481,8 @@ fn main() {
     });
     runtime.run();
 }
-
+# #[cfg(windows)]
+# fn main() { }
 </code></pre></pre>
 <p>Still hanging in there? Good. Don't get frustrated if the code above is
 difficult to understand. If I hadn't written it myself I would probably feel
@@ -627,7 +628,7 @@ a state machine which can be in one of three states: <code>pending</code>, <code
 promise in the state <code>pending</code>.</p>
 <p>Since promises are re-written as state machines they also enable an even better
 syntax where we now can write our last example like this:</p>
-<pre><code>async function run() {
+<pre><code class="language-js ignore">async function run() {
     await timer(200);
     await timer(100);
     await timer(50);
diff --git a/book/3_generators_pin.html b/book/3_generators_pin.html
index afcf357..0d6e9e3 100644
--- a/book/3_generators_pin.html
+++ b/book/3_generators_pin.html
@@ -648,16 +648,16 @@ pub fn main() {
     let mut pinned1 = Box::pin(gen1);
     let mut pinned2 = Box::pin(gen2);
 
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) {
         println!(&quot;Gen1 got value {}&quot;, n);
     }
     
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) {
         println!(&quot;Gen2 got value {}&quot;, n);
     };
 
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
+    let _ = pinned1.as_mut().resume(());
+    let _ = pinned2.as_mut().resume(());
 }
 </code></pre></pre>
 
diff --git a/book/print.html b/book/print.html
index cf46bae..fd65c02 100644
--- a/book/print.html
+++ b/book/print.html
@@ -314,7 +314,7 @@ in that book. The code below is wildly unsafe and it's just to show a real examp
 It's not in any way meant to showcase &quot;best practice&quot;. Just so we're on
 the same page.</p>
 </blockquote>
-<pre><pre class="playpen"><code class="language-rust">#![feature(asm)]
+<pre><pre class="playpen"><code class="language-rust edition2018">#![feature(asm)]
 #![feature(naked_functions)]
 use std::ptr;
 
@@ -506,7 +506,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
     : &quot;alignstack&quot;
     );
 }
-
+# #[cfg(not(windows))]
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
@@ -523,7 +523,8 @@ fn main() {
     });
     runtime.run();
 }
-
+# #[cfg(windows)]
+# fn main() { }
 </code></pre></pre>
 <p>Still hanging in there? Good. Don't get frustrated if the code above is
 difficult to understand. If I hadn't written it myself I would probably feel
@@ -669,7 +670,7 @@ a state machine which can be in one of three states: <code>pending</code>, <code
 promise in the state <code>pending</code>.</p>
 <p>Since promises are re-written as state machines they also enable an even better
 syntax where we now can write our last example like this:</p>
-<pre><code>async function run() {
+<pre><code class="language-js ignore">async function run() {
     await timer(200);
     await timer(100);
     await timer(50);
@@ -1474,16 +1475,16 @@ pub fn main() {
     let mut pinned1 = Box::pin(gen1);
     let mut pinned2 = Box::pin(gen2);
 
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) {
         println!(&quot;Gen1 got value {}&quot;, n);
     }
     
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) {
         println!(&quot;Gen2 got value {}&quot;, n);
     };
 
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
+    let _ = pinned1.as_mut().resume(());
+    let _ = pinned2.as_mut().resume(());
 }
 </code></pre></pre>
 <h1><a class="header" href="#pin" id="pin">Pin</a></h1>
diff --git a/book/searchindex.js b/book/searchindex.js
index 39c5508..699e83f 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
-Object.assign(window.search, {"doc_urls":["introduction.html#futures-explained-in-200-lines-of-rust","introduction.html#what-does-this-book-give-you-that-isnt-covered-elsewhere","introduction.html#credits-and-thanks","0_background_information.html#some-background-information","0_background_information.html#threads-provided-by-the-operating-system","0_background_information.html#green-threads","0_background_information.html#callback-based-approaches","0_background_information.html#from-callbacks-to-promises","1_futures_in_rust.html#futures-in-rust","1_futures_in_rust.html#futures","1_futures_in_rust.html#leaf-futures","1_futures_in_rust.html#non-leaf-futures","1_futures_in_rust.html#runtimes","1_futures_in_rust.html#what-rusts-standard-library-takes-care-of","1_futures_in_rust.html#bonus-section","2_waker_context.html#waker-and-context","2_waker_context.html#the-waker","2_waker_context.html#the-context-type","2_waker_context.html#understanding-the-waker","2_waker_context.html#fat-pointers-in-rust","2_waker_context.html#bonus-section","3_generators_pin.html#generators","3_generators_pin.html#stackful-coroutinesgreen-threads","3_generators_pin.html#combinators","3_generators_pin.html#stackless-coroutinesgenerators","3_generators_pin.html#how-generators-work","3_generators_pin.html#bonus-section---self-referential-generators-in-rust-today","4_pin.html#pin","4_pin.html#definitions","4_pin.html#rules-to-remember","4_pin.html#projectionstructural-pinning","4_pin.html#pin-and-drop","4_pin.html#putting-it-all-together","6_future_example.html#futures-in-rust","6_future_example.html#implementing-our-own-futures","6_future_example.html#the-executor","6_future_example.html#the-future-implementation","6_future_example.html#why-using-thread-parkunpark-is-a-bad-idea-for-a-library","6_future_example.html#the-reactor","6_future_example.html#asyncawait-and-concurrent-futures","8_finished_example.html#our-finished-code","conclusion.html#conclusion-and-exercises","conclusion.html#reader-exercises","conclusion.html#avoid-threadpark","conclusion.html#avoid-wrapping-the-whole-reactor-in-a-mutex-and-pass-it-around","conclusion.html#avoid-creating-a-new-waker-for-every-event","conclusion.html#could-we-implement-more-methods-on-our-executor","conclusion.html#building-a-better-exectuor","conclusion.html#further-reading"],"index":{"documentStore":{"docInfo":{"0":{"body":107,"breadcrumbs":5,"title":5},"1":{"body":81,"breadcrumbs":5,"title":5},"10":{"body":62,"breadcrumbs":2,"title":2},"11":{"body":93,"breadcrumbs":3,"title":3},"12":{"body":126,"breadcrumbs":1,"title":1},"13":{"body":42,"breadcrumbs":5,"title":5},"14":{"body":67,"breadcrumbs":2,"title":2},"15":{"body":22,"breadcrumbs":2,"title":2},"16":{"body":69,"breadcrumbs":1,"title":1},"17":{"body":23,"breadcrumbs":2,"title":2},"18":{"body":46,"breadcrumbs":2,"title":2},"19":{"body":403,"breadcrumbs":3,"title":3},"2":{"body":29,"breadcrumbs":2,"title":2},"20":{"body":45,"breadcrumbs":2,"title":2},"21":{"body":81,"breadcrumbs":1,"title":1},"22":{"body":74,"breadcrumbs":3,"title":3},"23":{"body":92,"breadcrumbs":1,"title":1},"24":{"body":81,"breadcrumbs":2,"title":2},"25":{"body":911,"breadcrumbs":2,"title":2},"26":{"body":65,"breadcrumbs":7,"title":7},"27":{"body":47,"breadcrumbs":1,"title":1},"28":{"body":125,"breadcrumbs":1,"title":1},"29":{"body":623,"breadcrumbs":2,"title":2},"3":{"body":47,"breadcrumbs":2,"title":2},"30":{"body":20,"breadcrumbs":2,"title":2},"31":{"body":23,"breadcrumbs":2,"title":2},"32":{"body":9,"breadcrumbs":2,"title":2},"33":{"body":70,"breadcrumbs":2,"title":2},"34":{"body":25,"breadcrumbs":2,"title":2},"35":{"body":262,"breadcrumbs":1,"title":1},"36":{"body":416,"breadcrumbs":2,"title":2},"37":{"body":91,"breadcrumbs":6,"title":6},"38":{"body":843,"breadcrumbs":1,"title":1},"39":{"body":662,"breadcrumbs":3,"title":3},"4":{"body":232,"breadcrumbs":4,"title":4},"40":{"body":364,"breadcrumbs":2,"title":2},"41":{"body":86,"breadcrumbs":2,"title":2},"42":{"body":21,"breadcrumbs":2,"title":2},"43":{"body":39,"breadcrumbs":2,"title":2},"44":{"body":59,"breadcrumbs":7,"title":7},"45":{"body":24,"breadcrumbs":5,"title":5},"46":{"body":49,"breadcrumbs":4,"title":4},"47":{"body":50,"breadcrumbs":3,"title":3},"48":{"body":46,"breadcrumbs":2,"title":2},"5":{"body":576,"breadcrumbs":2,"title":2},"6":{"body":268,"breadcrumbs":3,"title":3},"7":{"body":229,"breadcrumbs":2,"title":2},"8":{"body":23,"breadcrumbs":2,"title":2},"9":{"body":104,"breadcrumbs":1,"title":1}},"docs":{"0":{"body":"This book aims to explain Futures in Rust using an example driven approach. The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. 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You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. 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The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n} fn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n} Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. 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The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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"boost":1},"title":{"boost":2}}}}
\ No newline at end of file
diff --git a/src/0_background_information.md b/src/0_background_information.md
index 6eddf3a..cf5d84e 100644
--- a/src/0_background_information.md
+++ b/src/0_background_information.md
@@ -138,7 +138,7 @@ this:
 > It's not in any way meant to showcase "best practice". Just so we're on
 > the same page.
 
-```rust
+```rust, edition2018
 #![feature(asm)]
 #![feature(naked_functions)]
 use std::ptr;
@@ -331,7 +331,7 @@ unsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) {
     : "alignstack"
     );
 }
-
+# #[cfg(not(windows))]
 fn main() {
     let mut runtime = Runtime::new();
     runtime.init();
@@ -348,7 +348,8 @@ fn main() {
     });
     runtime.run();
 }
-
+# #[cfg(windows)]
+# fn main() { }
 ```
 
 Still hanging in there? Good. Don't get frustrated if the code above is
@@ -516,7 +517,7 @@ promise in the state `pending`.
 Since promises are re-written as state machines they also enable an even better
 syntax where we now can write our last example like this:
 
-```
+```js, ignore
 async function run() {
     await timer(200);
     await timer(100);
diff --git a/src/3_generators_pin.md b/src/3_generators_pin.md
index de9cb53..b1e7c5f 100644
--- a/src/3_generators_pin.md
+++ b/src/3_generators_pin.md
@@ -541,16 +541,16 @@ pub fn main() {
     let mut pinned1 = Box::pin(gen1);
     let mut pinned2 = Box::pin(gen2);
 
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) {
         println!("Gen1 got value {}", n);
     }
     
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) {
         println!("Gen2 got value {}", n);
     };
 
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
+    let _ = pinned1.as_mut().resume(());
+    let _ = pinned2.as_mut().resume(());
 }
 ```
 

From 21db34c022168f1bab5b26fcc57974778f86ec83 Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sun, 5 Apr 2020 01:08:55 +0200
Subject: [PATCH 09/10] formatting

---
 book/0_background_information.html | 2 +-
 book/print.html                    | 2 +-
 src/0_background_information.md    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/book/0_background_information.html b/book/0_background_information.html
index f9519fa..1bc781f 100644
--- a/book/0_background_information.html
+++ b/book/0_background_information.html
@@ -487,7 +487,7 @@ fn main() {
 <p>Still hanging in there? Good. Don't get frustrated if the code above is
 difficult to understand. If I hadn't written it myself I would probably feel
 the same. You can always go back and read the book which explains it later.</p>
-<h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
+<h2><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h2>
 <p>You probably already know what we're going to talk about in the next paragraphs
 from Javascript which I assume most know. </p>
 <blockquote>
diff --git a/book/print.html b/book/print.html
index fd65c02..e598425 100644
--- a/book/print.html
+++ b/book/print.html
@@ -529,7 +529,7 @@ fn main() {
 <p>Still hanging in there? Good. Don't get frustrated if the code above is
 difficult to understand. If I hadn't written it myself I would probably feel
 the same. You can always go back and read the book which explains it later.</p>
-<h3><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h3>
+<h2><a class="header" href="#callback-based-approaches" id="callback-based-approaches">Callback based approaches</a></h2>
 <p>You probably already know what we're going to talk about in the next paragraphs
 from Javascript which I assume most know. </p>
 <blockquote>
diff --git a/src/0_background_information.md b/src/0_background_information.md
index cf5d84e..109c723 100644
--- a/src/0_background_information.md
+++ b/src/0_background_information.md
@@ -356,7 +356,7 @@ Still hanging in there? Good. Don't get frustrated if the code above is
 difficult to understand. If I hadn't written it myself I would probably feel
 the same. You can always go back and read the book which explains it later.
 
-### Callback based approaches
+## Callback based approaches
 
 You probably already know what we're going to talk about in the next paragraphs
 from Javascript which I assume most know. 

From 9b2401b8a4496b96b61754f5d7c5517c0cea8d3c Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sun, 5 Apr 2020 17:09:05 +0200
Subject: [PATCH 10/10] version3

---
 book/0_background_information.html |   18 +-
 book/1_futures_in_rust.html        |    2 +-
 book/2_waker_context.html          |    5 +-
 book/3_generators_pin.html         |  398 +++++------
 book/4_pin.html                    |  585 ++++++++++++----
 book/highlight.css                 |    2 +-
 book/print.html                    | 1008 +++++++++++++++++++---------
 book/searchindex.js                |    2 +-
 book/searchindex.json              |    2 +-
 src/0_background_information.md    |   19 +-
 src/1_futures_in_rust.md           |    2 +-
 src/2_waker_context.md             |    5 +-
 src/3_generators_pin.md            |  424 ++++++------
 src/4_pin.md                       |  585 +++++++++++++---
 theme/highlight.css                |    2 +-
 15 files changed, 2091 insertions(+), 968 deletions(-)

diff --git a/book/0_background_information.html b/book/0_background_information.html
index 1bc781f..e365216 100644
--- a/book/0_background_information.html
+++ b/book/0_background_information.html
@@ -227,11 +227,15 @@ async library.</p>
 that they implement a way to do multitasking by having a &quot;userland&quot;
 runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
-<p>Green threads has been popularized by GO in the recent years. Green threads
-uses the same basic technique as operating systems does to handle concurrency.</p>
-<p>Green threads are implemented by setting up a stack for each task you want to
-execute and make the CPU &quot;jump&quot; from one stack to another to switch between
-tasks.</p>
+<p>Green threads uses the same mechanism as an OS does by creating a thread for
+each task, setting up a stack, save the CPU's state and jump from one
+task(thread) to another by doing a &quot;context switch&quot;.</p>
+<p>We yield control to the scheduler (which is a central part of the runtime in
+such a system) which then continues running a different task.</p>
+<p>Rust had green threads once, but they were removed before it hit 1.0. The state
+of execution is stored in each stack so in such a solution there would be no
+need for async, await, Futures or Pin. All this would be implementation details
+for the library.</p>
 <p>The typical flow will be like this:</p>
 <ol>
 <li>Run som non-blocking code</li>
@@ -240,7 +244,7 @@ tasks.</p>
 &quot;jumps&quot; to that stack</li>
 <li>Run some non-blocking code on the new thread until a new blocking call or the
 task is finished</li>
-<li>&quot;jumps&quot; back to the &quot;main&quot; thread and so on</li>
+<li>&quot;jumps&quot; back to the &quot;main&quot; thread, schedule a new thread to run and jump to that</li>
 </ol>
 <p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
 second as you read this.</p>
@@ -638,7 +642,7 @@ syntax where we now can write our last example like this:</p>
 <p>You can consider the <code>run</code> function a <em>pausable</em> task consisting of several
 sub-tasks. On each &quot;await&quot; point it yields control to the scheduler (in this
 case it's the well known Javascript event loop). Once one of the sub-tasks changes
-state to either <code>fulfilled</code> or <code>rejected</code> the task is sheduled to continue to
+state to either <code>fulfilled</code> or <code>rejected</code> the task is scheduled to continue to
 the next step.</p>
 <p>Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
 Rusts Futures 3.0 is a lot like async/await in our last example.</p>
diff --git a/book/1_futures_in_rust.html b/book/1_futures_in_rust.html
index 449de53..7e5619f 100644
--- a/book/1_futures_in_rust.html
+++ b/book/1_futures_in_rust.html
@@ -229,7 +229,7 @@ learning one makes learning the next much easier.</p>
 <p>The difference between Rust and other languages is that you have to make an
 active choice when it comes to picking a runtime. Most often, in other languages
 you'll just use the one provided for you.</p>
-<p>An async runtime can be divided into two parts:</p>
+<p><strong>An async runtime can be divided into two parts:</strong></p>
 <ol>
 <li>The Executor</li>
 <li>The Reactor</li>
diff --git a/book/2_waker_context.html b/book/2_waker_context.html
index e118056..8f6dc29 100644
--- a/book/2_waker_context.html
+++ b/book/2_waker_context.html
@@ -151,7 +151,7 @@
                     <main>
                         <h1><a class="header" href="#waker-and-context" id="waker-and-context">Waker and Context</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
 <li>Understanding how the Waker object is constructed</li>
 <li>Learning how the runtime know when a leaf-future can resume</li>
@@ -235,7 +235,7 @@ object from these parts:</p>
 and try to run it. If you want to go back, press the undo symbol. Keep an eye
 out for these as we go forward. Many examples will be editable.</p>
 </blockquote>
-<pre><pre class="playpen"><code class="language-rust editable">// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)
+<pre><pre class="playpen"><code class="language-rust">// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)
 trait Test {
     fn add(&amp;self) -&gt; i32;
     fn sub(&amp;self) -&gt; i32;
@@ -293,7 +293,6 @@ fn main() {
     println!(&quot;Sub: 3 - 2 = {}&quot;, test.sub());
     println!(&quot;Mul: 3 * 2 = {}&quot;, test.mul());
 }
-
 </code></pre></pre>
 <p>Now that you know this you also know why how we implement the <code>Waker</code> type
 in Rust.</p>
diff --git a/book/3_generators_pin.html b/book/3_generators_pin.html
index 0d6e9e3..bb424ec 100644
--- a/book/3_generators_pin.html
+++ b/book/3_generators_pin.html
@@ -151,11 +151,11 @@
                     <main>
                         <h1><a class="header" href="#generators" id="generators">Generators</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
-<li>Understanding how the async/await syntax works since it's how <code>await</code> is implemented</li>
-<li>Knowing why we need <code>Pin</code></li>
-<li>Understanding why Rusts async model is very efficient</li>
+<li>Understandi how the async/await syntax works since it's how <code>await</code> is implemented</li>
+<li>Know why we need <code>Pin</code></li>
+<li>Understand why Rusts async model is very efficient</li>
 </ul>
 <p>The motivation for <code>Generators</code> can be found in <a href="https://github.com/rust-lang/rfcs/blob/master/text/2033-experimental-coroutines.md">RFC#2033</a>. It's very
 well written and I can recommend reading through it (it talks as much about
@@ -172,17 +172,9 @@ handle concurrency:</p>
 <li>Using combinators.</li>
 <li>Stackless coroutines, better known as generators.</li>
 </ol>
-<h3><a class="header" href="#stackful-coroutinesgreen-threads" id="stackful-coroutinesgreen-threads">Stackful coroutines/green threads</a></h3>
-<p>I've written about green threads before. Go check out 
-<a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust</a> if you're interested.</p>
-<p>Green threads uses the same mechanism as an OS does by creating a thread for
-each task, setting up a stack, save the CPU's state and jump from one
-task(thread) to another by doing a &quot;context switch&quot;.</p>
-<p>We yield control to the scheduler (which is a central part of the runtime in
-such a system) which then continues running a different task.</p>
-<p>Rust had green threads once, but they were removed before it hit 1.0. The state
-of execution is stored in each stack so in such a solution there would be no need
-for <code>async</code>, <code>await</code>, <code>Futures</code> or <code>Pin</code>. All this would be implementation details for the library.</p>
+<p>We covered <a href="0_background_information.html#green-threads">green threads in the background information</a>
+so we won't repeat that here. We'll concentrate on the variants of stackless
+coroutines which Rust uses today.</p>
 <h3><a class="header" href="#combinators" id="combinators">Combinators</a></h3>
 <p><code>Futures 1.0</code> used combinators. If you've worked with <code>Promises</code> in JavaScript,
 you already know combinators. In Rust they look like this:</p>
@@ -227,10 +219,13 @@ async/await as keywords (it can even be done using a macro).</li>
     println!(&quot;{}&quot;, borrowed);
 }
 </code></pre>
-<p>Generators in Rust are implemented as state machines. The memory footprint of a
-chain of computations is only defined by the largest footprint of any single
-step require. That means that adding steps to a chain of computations might not
-require any increased memory at all.</p>
+<p>Async in Rust is implemented using Generators. So to understand how Async really
+works we need to understand generators first. Generators in Rust are implemented
+as state machines. The memory footprint of a chain of computations is only
+defined by the largest footprint of what the largest step require. </p>
+<p>That means that adding steps to a chain of computations might not require any
+increased memory at all and it's one of the reasons why Futures and Async in
+Rust has very little overhead.</p>
 <h2><a class="header" href="#how-generators-work" id="how-generators-work">How generators work</a></h2>
 <p>In Nightly Rust today you can use the <code>yield</code> keyword. Basically using this
 keyword in a closure, converts it to a generator. A closure could look like this
@@ -302,19 +297,17 @@ impl Generator for GeneratorA {
         match std::mem::replace(&amp;mut *self, GeneratorA::Exit) {
             GeneratorA::Enter(a1) =&gt; {
 
-          /*|---code before yield---|*/
-          /*|*/ println!(&quot;Hello&quot;); /*|*/ 
-          /*|*/ let a = a1 * 2;    /*|*/
-          /*|------------------------|*/
+          /*----code before yield----*/
+                println!(&quot;Hello&quot;);
+                let a = a1 * 2;
 
                 *self = GeneratorA::Yield1(a);
                 GeneratorState::Yielded(a)
             }
-            GeneratorA::Yield1(_) =&gt; {
 
-          /*|----code after yield----|*/
-          /*|*/ println!(&quot;world!&quot;); /*|*/ 
-          /*|-------------------------|*/
+            GeneratorA::Yield1(_) =&gt; {
+          /*-----code after yield-----*/
+                println!(&quot;world!&quot;);
 
                 *self = GeneratorA::Exit;
                 GeneratorState::Complete(())
@@ -340,23 +333,34 @@ limitation just slip and call it a day yet.</p>
 <p>We'll use the optimized version of the state machines which is used in Rust today. For a more
 in depth explanation see <a href="https://tmandry.gitlab.io/blog/posts/optimizing-await-1/">Tyler Mandry's excellent article: How Rust optimizes async/await</a></p>
 </blockquote>
-<pre><code class="language-rust noplaypen ignore">let mut gen = move || {
+<pre><code class="language-rust noplaypen ignore">let mut generator = move || {
         let to_borrow = String::from(&quot;Hello&quot;);
         let borrowed = &amp;to_borrow;
         yield borrowed.len();
         println!(&quot;{} world!&quot;, borrowed);
     };
 </code></pre>
+<p>We'll be hand-coding some versions of a state-machines representing a state
+machine for the generator defined aboce.</p>
+<p>We step through each step &quot;manually&quot; in every example, so it looks pretty
+unfamiliar. We could add some syntactic sugar like implementing the <code>Iterator</code>
+trait for our generators which would let us do this:</p>
+<pre><pre class="playpen"><code class="language-rust ingore">
+# #![allow(unused_variables)]
+#fn main() {
+for val in generator {
+    println!(&quot;{}&quot;, val);
+}
+#}</code></pre></pre>
+<p>It's a pretty trivial change to make, but this chapter is already getting long.
+Just keep this in the back of your head as we move forward.</p>
 <p>Now what does our rewritten state machine look like with this example?</p>
 <pre><pre class="playpen"><code class="language-rust compile_fail">
 # #![allow(unused_variables)]
 #fn main() {
-# // If you've ever wondered why the parameters are called Y and R the naming from
-# // the original rfc most likely holds the answer
 # enum GeneratorState&lt;Y, R&gt; {
-#     // originally called `CoResult`
-#     Yielded(Y),  // originally called `Yield(Y)`
-#     Complete(R), // originally called `Return(R)`
+#     Yielded(Y), 
+#     Complete(R),
 # }
 # 
 # trait Generator {
@@ -388,7 +392,7 @@ impl Generator for GeneratorA {
         match std::mem::replace(&amp;mut *self, GeneratorA::Exit) {
             GeneratorA::Enter =&gt; {
                 let to_borrow = String::from(&quot;Hello&quot;);
-                let borrowed = &amp;to_borrow;
+                let borrowed = &amp;to_borrow; // &lt;--- NB!
                 let res = borrowed.len();
 
                 *self = GeneratorA::Yield1 {to_borrow, borrowed};
@@ -414,30 +418,9 @@ to make this work, we'll have to let the compiler know that <em>we</em> control
 see we end up in a <em>self referential struct</em>. A struct which holds references
 into itself.</p>
 <p>As you'll notice, this compiles just fine!</p>
-<pre><pre class="playpen"><code class="language-rust editable">pub fn main() {
-    let mut gen = GeneratorA::start();
-    let mut gen2 = GeneratorA::start();
-
-    if let GeneratorState::Yielded(n) = gen.resume() {
-        println!(&quot;Got value {}&quot;, n);
-    }
-    
-    // If you uncomment this, very bad things can happen. This is why we need `Pin`
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-
-    if let GeneratorState::Yielded(n) = gen2.resume() {
-        println!(&quot;Got value {}&quot;, n);
-    }
-
-    // if you uncomment `mem::swap`.. this should now start gen2.
-    if let GeneratorState::Complete(()) = gen.resume() {
-        ()
-    };
-}
-
-enum GeneratorState&lt;Y, R&gt; {
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
+<pre><code class="language-rust ignore">enum GeneratorState&lt;Y, R&gt; {
+    Yielded(Y),  
+    Complete(R), 
 }
 
 trait Generator {
@@ -450,7 +433,7 @@ enum GeneratorA {
     Enter,
     Yield1 {
         to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
+        borrowed: *const String,
     },
     Exit,
 }
@@ -464,20 +447,18 @@ impl Generator for GeneratorA {
     type Yield = usize;
     type Return = ();
     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
-        // lets us get ownership over current state
             match self {
             GeneratorA::Enter =&gt; {
                 let to_borrow = String::from(&quot;Hello&quot;);
                 let borrowed = &amp;to_borrow;
                 let res = borrowed.len();
-
-                // Trick to actually get a self reference
                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match self {
-                 GeneratorA::Yield1{to_borrow, borrowed} =&gt; *borrowed = to_borrow,
-                 _ =&gt; unreachable!(),  
-                };
-
+                
+                // We set the self-reference here
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+               
                 GeneratorState::Yielded(res)
             }
 
@@ -491,137 +472,172 @@ impl Generator for GeneratorA {
         }
     }
 }
-</code></pre></pre>
-<blockquote>
-<p>Try to uncomment the line with <code>mem::swap</code> and see the results.</p>
-</blockquote>
-<p>While the example above compiles just fine, we expose consumers of this this API 
-to both possible undefined behavior and other memory errors while using just safe
-Rust. This is a big problem!</p>
-<p>But now, let's prevent this problem using <code>Pin</code>. We'll discuss
-<code>Pin</code> more in the next chapter, but you'll get an introduction here by just
-reading the comments.</p>
-<pre><pre class="playpen"><code class="language-rust editable">#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
-use std::pin::Pin;
-
-pub fn main() {
-    let gen1 = GeneratorA::start();
-    let gen2 = GeneratorA::start();
-    // Before we pin the pointers, this is safe to do
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-
-    // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe.
-    // However, as you'll see in the start of the next chapter value pinned to
-    // heap can be constructed while staying in safe Rust so we can use
-    // that to avoid unsafe. You can also use crates like `pin_utils` to do 
-    // this safely, just remember that they use unsafe under the hood so it's 
-    // like using an already-reviewed unsafe implementation.
-
-    let mut pinned1 = Box::pin(gen1);
-    let mut pinned2 = Box::pin(gen2);
-    // Uncomment these if you think it's safe to pin the values to the stack instead 
-    // (it is in this case). Remember to comment out the two previous lines first.
-    //let mut pinned1 = unsafe { Pin::new_unchecked(&amp;mut gen1) };
-    //let mut pinned2 = unsafe { Pin::new_unchecked(&amp;mut gen2) };
-
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
-        println!(&quot;Gen1 got value {}&quot;, n);
-    }
-    
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
-        println!(&quot;Gen2 got value {}&quot;, n);
+</code></pre>
+<p>Remember that our example is the generator we crated which looked like this:</p>
+<pre><code class="language-rust noplaypen ignore">let mut gen = move || {
+        let to_borrow = String::from(&quot;Hello&quot;);
+        let borrowed = &amp;to_borrow;
+        yield borrowed.len();
+        println!(&quot;{} world!&quot;, borrowed);
     };
+</code></pre>
+<p>Below is an example of how we could run this state-machine. But there is still
+one huge problem with this:</p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
 
-    // This won't work
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-    // This will work but will just swap the pointers. Nothing inherently bad happens here.
-    // std::mem::swap(&amp;mut pinned1, &amp;mut pinned2);
-
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
-}
-
-enum GeneratorState&lt;Y, R&gt; {
-    // originally called `CoResult`
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
-}
-
-trait Generator {
-    type Yield;
-    type Return;
-    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
-}
-
-enum GeneratorA {
-    Enter,
-    Yield1 {
-        to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
-    },
-    Exit,
-}
-
-impl GeneratorA {
-    fn start() -&gt; Self {
-        GeneratorA::Enter
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!(&quot;Got value {}&quot;, n);
     }
-}
 
-// This tells us that the underlying pointer is not safe to move after pinning. In this case,
-// only we as implementors &quot;feel&quot; this, however, if someone is relying on our Pinned pointer
-// this will prevent them from moving it. You need to enable the feature flag 
-// `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.
-// Normally, you would use `std::marker::PhantomPinned` to indicate that the
-// struct is `!Unpin`.
-impl !Unpin for GeneratorA { }
-
-impl Generator for GeneratorA {
-    type Yield = usize;
-    type Return = ();
-    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
-        // lets us get ownership over current state
-        let this = unsafe { self.get_unchecked_mut() };
-            match this {
-            GeneratorA::Enter =&gt; {
-                let to_borrow = String::from(&quot;Hello&quot;);
-                let borrowed = &amp;to_borrow;
-                let res = borrowed.len();
-
-                // Trick to actually get a self reference. We can't reference
-                // the `String` earlier since these references will point to the
-                // location in this stack frame which will not be valid anymore
-                // when this function returns.
-                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match this {
-                 GeneratorA::Yield1{to_borrow, borrowed} =&gt; *borrowed = to_borrow,
-                 _ =&gt; unreachable!(),  
-                };
-
-                GeneratorState::Yielded(res)
-            }
-
-            GeneratorA::Yield1 {borrowed, ..} =&gt; {
-                let borrowed: &amp;String = unsafe {&amp;**borrowed};
-                println!(&quot;{} world&quot;, borrowed);
-                *this = GeneratorA::Exit;
-                GeneratorState::Complete(())
-            }
-            GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
-        }
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!(&quot;Got value {}&quot;, n);
     }
+
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
 }
+# enum GeneratorState&lt;Y, R&gt; {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -&gt; Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+#             match self {
+#             GeneratorA::Enter =&gt; {
+#                 let to_borrow = String::from(&quot;Hello&quot;);
+#                 let borrowed = &amp;to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} =&gt; {
+#                 let borrowed: &amp;String = unsafe {&amp;**borrowed};
+#                 println!(&quot;{} world&quot;, borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+#         }
+#     }
+# }
 </code></pre></pre>
-<p>Now, as you see, the consumer of this API must either:</p>
-<ol>
-<li>Box the value and thereby allocating it on the heap</li>
-<li>Use <code>unsafe</code> and pin the value to the stack. The user knows that if they move
-the value afterwards it will violate the guarantee they promise to uphold when
-they did their unsafe implementation.</li>
-</ol>
-<p>Hopefully, after this you'll have an idea of what happens when you use the
-<code>yield</code> or <code>await</code> keywords inside an async function, and why we need <code>Pin</code> if
-we want to be able to safely borrow across <code>yield/await</code> points.</p>
+<p>The problem however is that in safe Rust we can still do this:</p>
+<p><em>Run the code and compare the results. Do you see the problem?</em></p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
+
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!(&quot;Got value {}&quot;, n);
+    }
+
+    std::mem::swap(&amp;mut gen, &amp;mut gen2); // &lt;--- Big problem!
+
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!(&quot;Got value {}&quot;, n);
+    }
+
+    // This would now start gen2 since we swapped them.
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
+}
+# enum GeneratorState&lt;Y, R&gt; {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -&gt; Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+#             match self {
+#             GeneratorA::Enter =&gt; {
+#                 let to_borrow = String::from(&quot;Hello&quot;);
+#                 let borrowed = &amp;to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} =&gt; {
+#                 let borrowed: &amp;String = unsafe {&amp;**borrowed};
+#                 println!(&quot;{} world&quot;, borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+#         }
+#     }
+# }
+</code></pre></pre>
+<p>Wait? What happened to &quot;Hello&quot;?</p>
+<p>Turns out that while the example above compiles
+just fine, we expose consumers of this this API to both possible undefined
+behavior and other memory errors while using just safe Rust. This is a big
+problem!</p>
+<p>We'll explain exactly what happened using a slightly simpler example in the next
+chapter and we'll fix our generator using <code>Pin</code> so join me as we explore
+the last topic before we implement our main Futures example.</p>
 <h2><a class="header" href="#bonus-section---self-referential-generators-in-rust-today" id="bonus-section---self-referential-generators-in-rust-today">Bonus section - self referential generators in Rust today</a></h2>
 <p>Thanks to <a href="https://github.com/rust-lang/rust/pull/45337/files">PR#45337</a> you can actually run code like the one in our
 example in Rust today using the <code>static</code> keyword on nightly. Try it for
diff --git a/book/4_pin.html b/book/4_pin.html
index ca1da2b..4ab728a 100644
--- a/book/4_pin.html
+++ b/book/4_pin.html
@@ -151,99 +151,53 @@
                     <main>
                         <h1><a class="header" href="#pin" id="pin">Pin</a></h1>
 <blockquote>
-<p><strong>Relevant for</strong></p>
+<p><strong>Overview</strong></p>
 <ol>
-<li>Understanding <code>Generators</code> and <code>Futures</code></li>
-<li>Knowing how to use <code>Pin</code> is required when implementing your own <code>Future</code></li>
-<li>Understanding how to make self-referential types safe to use in Rust</li>
-<li>Learning how borrowing across <code>await</code> points is accomplished</li>
+<li>Learn how to use <code>Pin</code> and why it's required when implementing your own <code>Future</code></li>
+<li>Understand how to make self-referential types safe to use in Rust</li>
+<li>Learn how borrowing across <code>await</code> points is accomplished</li>
+<li>Get a set of practical rules to help you work with <code>Pin</code></li>
 </ol>
 <p><code>Pin</code> was suggested in <a href="https://github.com/rust-lang/rfcs/blob/master/text/2349-pin.md">RFC#2349</a></p>
 </blockquote>
-<p>We already got a brief introduction of <code>Pin</code> in the previous chapters, so we'll
-start off without any further introduction.</p>
-<p>Let's jump strait to some definitions and then create 10 rules to remember when
-we work with <code>Pin</code>.</p>
+<p>Let's jump strait to it. Pinning is one of those subjects which is hard to wrap
+your head around in the start, but once you unlock a mental model for it
+it gets significantly easier to reason about.</p>
 <h2><a class="header" href="#definitions" id="definitions">Definitions</a></h2>
+<p>Pin is only relevant for pointers. A reference to an object is a pointer.</p>
 <p>Pin consists of the <code>Pin</code> type and the <code>Unpin</code> marker. Pin's purpose in life is
 to govern the rules that need to apply for types which implement <code>!Unpin</code>.</p>
-<p>Pin is only relevant for pointers. A reference to an object is a pointer.</p>
 <p>Yep, you're right, that's double negation right there. <code>!Unpin</code> means
 &quot;not-un-pin&quot;.</p>
-<p><em>This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by
-<code>!Unpin</code> it's a good sign that it's time to lay down the work and start over
-tomorrow with a fresh mind.</em></p>
 <blockquote>
-<p>On a more serious note, I feel obliged to mention that there are valid reasons for the names
-that were chosen. If you want to you can read a bit of the discussion from the
-<a href="https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12">internals thread</a>. One of the best takeaways from there in my eyes
-is this quote from <code>tmandry</code>:</p>
-<p><em>Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful.</em></p>
+<p><em>This naming scheme is one of Rusts safety features where it deliberately
+tests if you're too tired to safely implement a type with this marker. If
+you're starting to get confused, or even angry, by <code>!Unpin</code> it's a good sign
+that it's time to lay down the work and start over tomorrow with a fresh mind.</em></p>
 </blockquote>
-<p>For the next paragraph we'll rename these markers to:</p>
+<p>On a more serious note, I feel obliged to mention that there are valid reasons
+for the names that were chosen. Naming is not easy, and I considered renaming
+<code>Unpin</code> and <code>!Unpin</code> in this book to make them easier to reason about. </p>
+<p>However, an experienced member of the Rust community convinced me that that there
+is just too many nuances and edge-cases to consider which is easily overlooked when
+naively giving these markers different names, and I'm convinced that we'll
+just have to get used to them and use them as is.</p>
+<p>If you want to you can read a bit of the discussion from the
+<a href="https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12">internals thread</a>. One of the best takeaways from there in my
+eyes is this quote from <code>tmandry</code>:</p>
 <blockquote>
-<p><code>!Unpin</code> = <code>MustStay</code> and <code>Unpin</code> = <code>CanMove</code></p>
+<p><em>Think of taking a thumbtack out of a cork board so you can tweak how a flyer
+looks. For Unpin types, this unpinning is directly supported by the type; you
+can do this implicitly. You can even swap out the object with another before you
+put the pin back. For other types, you must be much more careful.</em></p>
 </blockquote>
-<p>It just makes it much easier to talk about them.</p>
-<h2><a class="header" href="#rules-to-remember" id="rules-to-remember">Rules to remember</a></h2>
-<ol>
-<li>
-<p>If <code>T: CanMove</code> (which is the default), then <code>Pin&lt;'a, T&gt;</code> is entirely equivalent to <code>&amp;'a mut T</code>. in other words: <code>CanMove</code> means it's OK for this type to be moved even when pinned, so <code>Pin</code> will have no effect on such a type.</p>
-</li>
-<li>
-<p>Getting a <code>&amp;mut T</code> to a pinned pointer requires unsafe if <code>T: MustStay</code>. In other words: requiring a pinned pointer to a type which is <code>MustStay</code> prevents the <em>user</em> of that API from moving that value unless it choses to write <code>unsafe</code> code.</p>
-</li>
-<li>
-<p>Pinning does nothing special with memory allocation like putting it into some &quot;read only&quot; memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden.</p>
-</li>
-<li>
-<p>Most standard library types implement <code>CanMove</code>. The same goes for most
-&quot;normal&quot; types you encounter in Rust. <code>Futures</code> and <code>Generators</code> are two
-exceptions.</p>
-</li>
-<li>
-<p>The main use case for <code>Pin</code> is to allow self referential types, the whole
-justification for stabilizing them was to allow that. There are still corner
-cases in the API which are being explored.</p>
-</li>
-<li>
-<p>The implementation behind objects that are <code>MustStay</code> is most likely unsafe.
-Moving such a type can cause the universe to crash. As of the time of writing
-this book, creating and reading fields of a self referential struct still requires <code>unsafe</code>.</p>
-</li>
-<li>
-<p>You can add a <code>MustStay</code> bound on a type on nightly with a feature flag, or
-by adding <code>std::marker::PhantomPinned</code> to your type on stable.</p>
-</li>
-<li>
-<p>You can either pin a value to memory on the stack or on the heap.</p>
-</li>
-<li>
-<p>Pinning a <code>MustStay</code> pointer to the stack requires <code>unsafe</code></p>
-</li>
-<li>
-<p>Pinning a <code>MustStay</code> pointer to the heap does not require <code>unsafe</code>. There is a shortcut for doing this using <code>Box::pin</code>.</p>
-</li>
-</ol>
-<blockquote>
-<p>Unsafe code does not mean it's literally &quot;unsafe&quot;, it only relieves the 
-guarantees you normally get from the compiler. An <code>unsafe</code> implementation can 
-be perfectly safe to do, but you have no safety net.</p>
-</blockquote>
-<p>Let's take a look at an example:</p>
-<pre><pre class="playpen"><code class="language-rust editable">use std::pin::Pin;
-
-fn main() {
-    let mut test1 = Test::new(&quot;test1&quot;);
-    test1.init();
-    let mut test2 = Test::new(&quot;test2&quot;);
-    test2.init();
-
-    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
-    std::mem::swap(&amp;mut test1, &amp;mut test2); // try commenting out this line
-    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
-
-}
+<h2><a class="header" href="#pinning-and-self-referential-structs" id="pinning-and-self-referential-structs">Pinning and self-referential structs</a></h2>
+<p>Let's start where we left off in the last chapter by making the problem we
+saw using a self-referential struct in our generator a lot simpler by making
+some self-referential structs that are easier to reason about than our
+state machines:</p>
+<p>For now our example will look like this:</p>
+<pre><code class="language-rust ignore">use std::pin::Pin;
 
 #[derive(Debug)]
 struct Test {
@@ -259,7 +213,7 @@ impl Test {
             b: std::ptr::null(),
         }
     }
-    
+
     fn init(&amp;mut self) {
         let self_ref: *const String = &amp;self.a;
         self.b = self_ref;
@@ -273,7 +227,7 @@ impl Test {
         unsafe {&amp;*(self.b)}
     }
 }
-</code></pre></pre>
+</code></pre>
 <p>Let's walk through this example since we'll be using it the rest of this chapter.</p>
 <p>We have a self-referential struct <code>Test</code>. <code>Test</code> needs an <code>init</code> method to be
 created which is strange but we'll need that to keep this example as short as
@@ -281,25 +235,165 @@ possible.</p>
 <p><code>Test</code> provides two methods to get a reference to the value of the fields
 <code>a</code> and <code>b</code>. Since <code>b</code> is a reference to <code>a</code> we store it as a pointer since
 the borrowing rules of Rust doesn't allow us to define this lifetime.</p>
+<p>Now, let's use this example to explain the problem we encounter in detail. As
+you see, this works as expected:</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     // We need an `init` method to actually set our self-reference
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
 <p>In our main method we first instantiate two instances of <code>Test</code> and print out
-the value of the fields on <code>test1</code>. We get:</p>
+the value of the fields on <code>test1</code>. We get what we'd expect:</p>
 <pre><code class="language-rust ignore">a: test1, b: test1
+a: test2, b: test2
 </code></pre>
-<p>Next we swap the data stored at the memory location which <code>test1</code> is pointing to
-with the data stored at the memory location <code>test2</code> is pointing to and vice a versa.</p>
-<p>We should expect that printing the fields of <code>test2</code> should display the same as
-<code>test1</code> (since the object we printed before the swap has moved there now).</p>
-<pre><code class="language-rust ignore">a: test1, b: test2
+<p>Let's see what happens if we swap the data stored at the memory location
+which <code>test1</code> is pointing to with the data stored at the memory location
+<code>test2</code> is pointing to and vice a versa.</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    std::mem::swap(&amp;mut test1, &amp;mut test2);
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
+<p>Naively, we could think that what we should get a debug print of <code>test1</code> two
+times like this</p>
+<pre><code class="language-rust ignore">a: test1, b: test1
+a: test1, b: test1
 </code></pre>
-<p>The pointer to <code>b</code> still points to the old location. That location is now
-occupied with the string &quot;test2&quot;. This can be a bit hard to visualize so I made
-a figure that i hope can help.</p>
+<p>But instead we get:</p>
+<pre><code class="language-rust ignore">a: test1, b: test1
+a: test1, b: test2
+</code></pre>
+<p>The pointer to <code>test2.b</code> still points to the old location which is inside <code>test1</code>
+now. The struct is not self-referential anymore, it holds a pointer to a field
+in a different object. That means we can't rely on the lifetime of <code>test2.b</code> to
+be tied to the lifetime of <code>test2</code> anymore.</p>
+<p>If your still not convinced, this should at least convince you:</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    std::mem::swap(&amp;mut test1, &amp;mut test2);
+    test1.a = &quot;I've totally changed now!&quot;.to_string();
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
+<p>That shouldn't happen. There is no serious error yet, but as you can imagine
+it's easy to create serious bugs using this code.</p>
+<p>I created a diagram to help visualize what's going on:</p>
 <p><strong>Fig 1: Before and after swap</strong>
 <img src="./assets/swap_problem.jpg" alt="swap_problem" /></p>
 <p>As you can see this results in unwanted behavior. It's easy to get this to 
 segfault, show UB and fail in other spectacular ways as well.</p>
-<p>If we change the example to using <code>Pin</code> instead:</p>
-<pre><pre class="playpen"><code class="language-rust editable">use std::pin::Pin;
+<h2><a class="header" href="#pinning-to-the-stack" id="pinning-to-the-stack">Pinning to the stack</a></h2>
+<p>Now, we can solve this problem by using <code>Pin</code> instead. Let's take a look at what
+our example would look like then:</p>
+<pre><code class="language-rust ignore">use std::pin::Pin;
 use std::marker::PhantomPinned;
 
 #[derive(Debug)]
@@ -333,8 +427,14 @@ impl Test {
         unsafe { &amp;*(self.b) }
     }
 }
-
-pub fn main() {
+</code></pre>
+<p>Now, what we've done here is pinning a stack address. That will always be
+<code>unsafe</code> if our type implements <code>!Unpin</code>.</p>
+<p>We use the same tricks here, including requiring an <code>init</code>. If we want to fix that
+and let users avoid <code>unsafe</code> we need to pin our data on the heap instead which
+we'll show in a second.</p>
+<p>Let's see what happens if we run our example now:</p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
     let mut test1 = Test::new(&quot;test1&quot;);
     test1.init();
     let mut test1_pin = unsafe { Pin::new_unchecked(&amp;mut test1) }; 
@@ -342,33 +442,103 @@ pub fn main() {
     test2.init();
     let mut test2_pin = unsafe { Pin::new_unchecked(&amp;mut test2) };
 
-    println!(
-        &quot;a: {}, b: {}&quot;,
-        Test::a(test1_pin.as_ref()),
-        Test::b(test1_pin.as_ref())
-    );
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
-    println!(
-        &quot;a: {}, b: {}&quot;,
-        Test::a(test2_pin.as_ref()),
-        Test::b(test2_pin.as_ref())
-    );
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
 }
-
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&amp;mut self) {
+#         let self_ptr: *const String = &amp;self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a str {
+#         &amp;self.get_ref().a
+#     }
+# 
+#     fn b&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a String {
+#         unsafe { &amp;*(self.b) }
+#     }
+# }
+</code></pre></pre>
+<p>Now, if we try to pull the same trick which got us in to trouble the last time
+you'll get a compilation error. So t</p>
+<pre><pre class="playpen"><code class="language-rust compile_fail">pub fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test1_pin = unsafe { Pin::new_unchecked(&amp;mut test1) }; 
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+    let mut test2_pin = unsafe { Pin::new_unchecked(&amp;mut test2) };
+
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
+}
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&amp;mut self) {
+#         let self_ptr: *const String = &amp;self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a str {
+#         &amp;self.get_ref().a
+#     }
+# 
+#     fn b&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a String {
+#         unsafe { &amp;*(self.b) }
+#     }
+# }
 </code></pre></pre>
-<p>Now, what we've done here is pinning a stack address. That will always be
-<code>unsafe</code> if our type implements <code>!Unpin</code> (aka <code>MustStay</code>).</p>
-<p>We use some tricks here, including requiring an <code>init</code>. If we want to fix that
-and let users avoid <code>unsafe</code> we need to pin our data on the heap instead.</p>
 <blockquote>
-<p>Stack pinning will always depend on the current stack frame we're in, so we
-can't create a self referential object in one stack frame and return it since
-any pointers we take to &quot;self&quot; is invalidated.</p>
+<p>It's important to note that stack pinning will always depend on the current
+stack frame we're in, so we can't create a self referential object in one
+stack frame and return it since any pointers we take to &quot;self&quot; is invalidated.</p>
 </blockquote>
-<p>The next example solves some of our friction at the cost of a heap allocation.</p>
-<pre><pre class="playpen"><code class="language-rust editbable">use std::pin::Pin;
+<h2><a class="header" href="#pinning-to-the-heap" id="pinning-to-the-heap">Pinning to the heap</a></h2>
+<p>For completeness let's remove some unsafe and the need for an <code>init</code> method
+at the cost of a heap allocation. Pinning to the heap is safe so the user
+doesn't need to implement any unsafe code:</p>
+<pre><pre class="playpen"><code class="language-rust">use std::pin::Pin;
 use std::marker::PhantomPinned;
 
 #[derive(Debug)]
@@ -407,9 +577,6 @@ pub fn main() {
     let mut test2 = Test::new(&quot;test2&quot;);
 
     println!(&quot;a: {}, b: {}&quot;,test1.as_ref().a(), test1.as_ref().b());
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(&amp;mut test1, &amp;mut test2);
     println!(&quot;a: {}, b: {}&quot;,test2.as_ref().a(), test2.as_ref().b());
 }
 </code></pre></pre>
@@ -419,6 +586,58 @@ makes sense. Once the data is allocated on the heap it will have a stable addres
 that the self-referential pointer stays valid.</p>
 <p>There are ways to safely give some guarantees on stack pinning as well, but right
 now you need to use a crate like <a href="https://docs.rs/pin-project/">pin_project</a> to do that.</p>
+<h2><a class="header" href="#practical-rules-for-pinning" id="practical-rules-for-pinning">Practical rules for Pinning</a></h2>
+<ol>
+<li>
+<p>If <code>T: Unpin</code> (which is the default), then <code>Pin&lt;'a, T&gt;</code> is entirely
+equivalent to <code>&amp;'a mut T</code>. in other words: <code>Unpin</code> means it's OK for this type
+to be moved even when pinned, so <code>Pin</code> will have no effect on such a type.</p>
+</li>
+<li>
+<p>Getting a <code>&amp;mut T</code> to a pinned pointer requires unsafe if <code>T: !Unpin</code>. In
+other words: requiring a pinned pointer to a type which is <code>!Unpin</code> prevents
+the <em>user</em> of that API from moving that value unless it choses to write <code>unsafe</code>
+code.</p>
+</li>
+<li>
+<p>Pinning does nothing special with memory allocation like putting it into some
+&quot;read only&quot; memory or anything fancy. It only tells the compiler that some
+operations on this value should be forbidden.</p>
+</li>
+<li>
+<p>Most standard library types implement <code>Unpin</code>. The same goes for most
+&quot;normal&quot; types you encounter in Rust. <code>Futures</code> and <code>Generators</code> are two
+exceptions.</p>
+</li>
+<li>
+<p>The main use case for <code>Pin</code> is to allow self referential types, the whole
+justification for stabilizing them was to allow that. There are still corner
+cases in the API which are being explored.</p>
+</li>
+<li>
+<p>The implementation behind objects that are <code>!Unpin</code> is most likely unsafe.
+Moving such a type can cause the universe to crash. As of the time of writing
+this book, creating and reading fields of a self referential struct still requires <code>unsafe</code>.</p>
+</li>
+<li>
+<p>You can add a <code>!Unpin</code> bound on a type on nightly with a feature flag, or
+by adding <code>std::marker::PhantomPinned</code> to your type on stable.</p>
+</li>
+<li>
+<p>You can either pin a value to memory on the stack or on the heap.</p>
+</li>
+<li>
+<p>Pinning a <code>!Unpin</code> pointer to the stack requires <code>unsafe</code></p>
+</li>
+<li>
+<p>Pinning a <code>!Unpin</code> pointer to the heap does not require <code>unsafe</code>. There is a shortcut for doing this using <code>Box::pin</code>.</p>
+</li>
+</ol>
+<blockquote>
+<p>Unsafe code does not mean it's literally &quot;unsafe&quot;, it only relieves the 
+guarantees you normally get from the compiler. An <code>unsafe</code> implementation can 
+be perfectly safe to do, but you have no safety net.</p>
+</blockquote>
 <h3><a class="header" href="#projectionstructural-pinning" id="projectionstructural-pinning">Projection/structural pinning</a></h3>
 <p>In short, projection is a programming language term. <code>mystruct.field1</code> is a
 projection. Structural pinning is using <code>Pin</code> on fields. This has several
@@ -431,6 +650,130 @@ extra care must be taken when implementing <code>Drop</code> for pinned types.</
 <h2><a class="header" href="#putting-it-all-together" id="putting-it-all-together">Putting it all together</a></h2>
 <p>This is exactly what we'll do when we implement our own <code>Futures</code> stay tuned, 
 we're soon finished.</p>
+<h2><a class="header" href="#bonus-section-fixing-our-self-referential-generator-and-learning-more-about-pin" id="bonus-section-fixing-our-self-referential-generator-and-learning-more-about-pin">Bonus section: Fixing our self-referential generator and learning more about Pin</a></h2>
+<p>But now, let's prevent this problem using <code>Pin</code>. We'll discuss
+<code>Pin</code> more in the next chapter, but you'll get an introduction here by just
+reading the comments.</p>
+<pre><pre class="playpen"><code class="language-rust">#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
+use std::pin::Pin;
+
+pub fn main() {
+    let gen1 = GeneratorA::start();
+    let gen2 = GeneratorA::start();
+    // Before we pin the pointers, this is safe to do
+    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
+
+    // constructing a `Pin::new()` on a type which does not implement `Unpin` is
+    // unsafe. A value pinned to heap can be constructed while staying in safe
+    // Rust so we can use that to avoid unsafe. You can also use crates like
+    // `pin_utils` to pin to the stack safely, just remember that they use
+    // unsafe under the hood so it's like using an already-reviewed unsafe
+    // implementation.
+
+    let mut pinned1 = Box::pin(gen1);
+    let mut pinned2 = Box::pin(gen2);
+
+    // Uncomment these if you think it's safe to pin the values to the stack instead 
+    // (it is in this case). Remember to comment out the two previous lines first.
+    //let mut pinned1 = unsafe { Pin::new_unchecked(&amp;mut gen1) };
+    //let mut pinned2 = unsafe { Pin::new_unchecked(&amp;mut gen2) };
+
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+        println!(&quot;Gen1 got value {}&quot;, n);
+    }
+    
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+        println!(&quot;Gen2 got value {}&quot;, n);
+    };
+
+    // This won't work:
+    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
+    // This will work but will just swap the pointers so nothing bad happens here:
+    // std::mem::swap(&amp;mut pinned1, &amp;mut pinned2);
+
+    let _ = pinned1.as_mut().resume();
+    let _ = pinned2.as_mut().resume();
+}
+
+enum GeneratorState&lt;Y, R&gt; {
+    Yielded(Y),  
+    Complete(R), 
+}
+
+trait Generator {
+    type Yield;
+    type Return;
+    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+}
+
+enum GeneratorA {
+    Enter,
+    Yield1 {
+        to_borrow: String,
+        borrowed: *const String,
+    },
+    Exit,
+}
+
+impl GeneratorA {
+    fn start() -&gt; Self {
+        GeneratorA::Enter
+    }
+}
+
+// This tells us that the underlying pointer is not safe to move after pinning.
+// In this case, only we as implementors &quot;feel&quot; this, however, if someone is
+// relying on our Pinned pointer this will prevent them from moving it. You need
+// to enable the feature flag `#![feature(optin_builtin_traits)]` and use the
+// nightly compiler to implement `!Unpin`. Normally, you would use
+// `std::marker::PhantomPinned` to indicate that the struct is `!Unpin`.
+impl !Unpin for GeneratorA { }
+
+impl Generator for GeneratorA {
+    type Yield = usize;
+    type Return = ();
+    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+        // lets us get ownership over current state
+        let this = unsafe { self.get_unchecked_mut() };
+            match this {
+            GeneratorA::Enter =&gt; {
+                let to_borrow = String::from(&quot;Hello&quot;);
+                let borrowed = &amp;to_borrow;
+                let res = borrowed.len();
+                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+
+                // Trick to actually get a self reference. We can't reference
+                // the `String` earlier since these references will point to the
+                // location in this stack frame which will not be valid anymore
+                // when this function returns.
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+
+                GeneratorState::Yielded(res)
+            }
+
+            GeneratorA::Yield1 {borrowed, ..} =&gt; {
+                let borrowed: &amp;String = unsafe {&amp;**borrowed};
+                println!(&quot;{} world&quot;, borrowed);
+                *this = GeneratorA::Exit;
+                GeneratorState::Complete(())
+            }
+            GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+        }
+    }
+}
+</code></pre></pre>
+<p>Now, as you see, the consumer of this API must either:</p>
+<ol>
+<li>Box the value and thereby allocating it on the heap</li>
+<li>Use <code>unsafe</code> and pin the value to the stack. The user knows that if they move
+the value afterwards it will violate the guarantee they promise to uphold when
+they did their unsafe implementation.</li>
+</ol>
+<p>Hopefully, after this you'll have an idea of what happens when you use the
+<code>yield</code> or <code>await</code> keywords inside an async function, and why we need <code>Pin</code> if
+we want to be able to safely borrow across <code>yield/await</code> points.</p>
 
                     </main>
 
diff --git a/book/highlight.css b/book/highlight.css
index 21964e5..c54bcb1 100644
--- a/book/highlight.css
+++ b/book/highlight.css
@@ -4,7 +4,7 @@
 
 /* Atelier-Dune Comment */
 .hljs-comment {
-  color:  rgb(255, 115, 0);;
+  color:  rgba(34, 0, 155, 0.5);;
   font-style: italic;
 }
 .hljs-quote {
diff --git a/book/print.html b/book/print.html
index e598425..70fe924 100644
--- a/book/print.html
+++ b/book/print.html
@@ -269,11 +269,15 @@ async library.</p>
 that they implement a way to do multitasking by having a &quot;userland&quot;
 runtime:</p>
 <h2><a class="header" href="#green-threads" id="green-threads">Green threads</a></h2>
-<p>Green threads has been popularized by GO in the recent years. Green threads
-uses the same basic technique as operating systems does to handle concurrency.</p>
-<p>Green threads are implemented by setting up a stack for each task you want to
-execute and make the CPU &quot;jump&quot; from one stack to another to switch between
-tasks.</p>
+<p>Green threads uses the same mechanism as an OS does by creating a thread for
+each task, setting up a stack, save the CPU's state and jump from one
+task(thread) to another by doing a &quot;context switch&quot;.</p>
+<p>We yield control to the scheduler (which is a central part of the runtime in
+such a system) which then continues running a different task.</p>
+<p>Rust had green threads once, but they were removed before it hit 1.0. The state
+of execution is stored in each stack so in such a solution there would be no
+need for async, await, Futures or Pin. All this would be implementation details
+for the library.</p>
 <p>The typical flow will be like this:</p>
 <ol>
 <li>Run som non-blocking code</li>
@@ -282,7 +286,7 @@ tasks.</p>
 &quot;jumps&quot; to that stack</li>
 <li>Run some non-blocking code on the new thread until a new blocking call or the
 task is finished</li>
-<li>&quot;jumps&quot; back to the &quot;main&quot; thread and so on</li>
+<li>&quot;jumps&quot; back to the &quot;main&quot; thread, schedule a new thread to run and jump to that</li>
 </ol>
 <p>These &quot;jumps&quot; are know as context switches. Your OS is doing it many times each
 second as you read this.</p>
@@ -680,7 +684,7 @@ syntax where we now can write our last example like this:</p>
 <p>You can consider the <code>run</code> function a <em>pausable</em> task consisting of several
 sub-tasks. On each &quot;await&quot; point it yields control to the scheduler (in this
 case it's the well known Javascript event loop). Once one of the sub-tasks changes
-state to either <code>fulfilled</code> or <code>rejected</code> the task is sheduled to continue to
+state to either <code>fulfilled</code> or <code>rejected</code> the task is scheduled to continue to
 the next step.</p>
 <p>Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
 Rusts Futures 3.0 is a lot like async/await in our last example.</p>
@@ -776,7 +780,7 @@ learning one makes learning the next much easier.</p>
 <p>The difference between Rust and other languages is that you have to make an
 active choice when it comes to picking a runtime. Most often, in other languages
 you'll just use the one provided for you.</p>
-<p>An async runtime can be divided into two parts:</p>
+<p><strong>An async runtime can be divided into two parts:</strong></p>
 <ol>
 <li>The Executor</li>
 <li>The Reactor</li>
@@ -818,7 +822,7 @@ it needs to be, so go on and read these chapters if you feel a bit unsure. </p>
 <p>However, if you feel that you have the basics covered, then let's get moving!</p>
 <h1><a class="header" href="#waker-and-context" id="waker-and-context">Waker and Context</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
 <li>Understanding how the Waker object is constructed</li>
 <li>Learning how the runtime know when a leaf-future can resume</li>
@@ -902,7 +906,7 @@ object from these parts:</p>
 and try to run it. If you want to go back, press the undo symbol. Keep an eye
 out for these as we go forward. Many examples will be editable.</p>
 </blockquote>
-<pre><pre class="playpen"><code class="language-rust editable">// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)
+<pre><pre class="playpen"><code class="language-rust">// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)
 trait Test {
     fn add(&amp;self) -&gt; i32;
     fn sub(&amp;self) -&gt; i32;
@@ -960,7 +964,6 @@ fn main() {
     println!(&quot;Sub: 3 - 2 = {}&quot;, test.sub());
     println!(&quot;Mul: 3 * 2 = {}&quot;, test.mul());
 }
-
 </code></pre></pre>
 <p>Now that you know this you also know why how we implement the <code>Waker</code> type
 in Rust.</p>
@@ -978,11 +981,11 @@ use purely global functions and state, or any other way you wish.</p>
 <p>This leaves a lot of options on the table for runtime implementors.</p>
 <h1><a class="header" href="#generators" id="generators">Generators</a></h1>
 <blockquote>
-<p><strong>Relevant for:</strong></p>
+<p><strong>Overview:</strong></p>
 <ul>
-<li>Understanding how the async/await syntax works since it's how <code>await</code> is implemented</li>
-<li>Knowing why we need <code>Pin</code></li>
-<li>Understanding why Rusts async model is very efficient</li>
+<li>Understandi how the async/await syntax works since it's how <code>await</code> is implemented</li>
+<li>Know why we need <code>Pin</code></li>
+<li>Understand why Rusts async model is very efficient</li>
 </ul>
 <p>The motivation for <code>Generators</code> can be found in <a href="https://github.com/rust-lang/rfcs/blob/master/text/2033-experimental-coroutines.md">RFC#2033</a>. It's very
 well written and I can recommend reading through it (it talks as much about
@@ -999,17 +1002,9 @@ handle concurrency:</p>
 <li>Using combinators.</li>
 <li>Stackless coroutines, better known as generators.</li>
 </ol>
-<h3><a class="header" href="#stackful-coroutinesgreen-threads" id="stackful-coroutinesgreen-threads">Stackful coroutines/green threads</a></h3>
-<p>I've written about green threads before. Go check out 
-<a href="https://cfsamson.gitbook.io/green-threads-explained-in-200-lines-of-rust/">Green Threads Explained in 200 lines of Rust</a> if you're interested.</p>
-<p>Green threads uses the same mechanism as an OS does by creating a thread for
-each task, setting up a stack, save the CPU's state and jump from one
-task(thread) to another by doing a &quot;context switch&quot;.</p>
-<p>We yield control to the scheduler (which is a central part of the runtime in
-such a system) which then continues running a different task.</p>
-<p>Rust had green threads once, but they were removed before it hit 1.0. The state
-of execution is stored in each stack so in such a solution there would be no need
-for <code>async</code>, <code>await</code>, <code>Futures</code> or <code>Pin</code>. All this would be implementation details for the library.</p>
+<p>We covered <a href="0_background_information.html#green-threads">green threads in the background information</a>
+so we won't repeat that here. We'll concentrate on the variants of stackless
+coroutines which Rust uses today.</p>
 <h3><a class="header" href="#combinators" id="combinators">Combinators</a></h3>
 <p><code>Futures 1.0</code> used combinators. If you've worked with <code>Promises</code> in JavaScript,
 you already know combinators. In Rust they look like this:</p>
@@ -1054,10 +1049,13 @@ async/await as keywords (it can even be done using a macro).</li>
     println!(&quot;{}&quot;, borrowed);
 }
 </code></pre>
-<p>Generators in Rust are implemented as state machines. The memory footprint of a
-chain of computations is only defined by the largest footprint of any single
-step require. That means that adding steps to a chain of computations might not
-require any increased memory at all.</p>
+<p>Async in Rust is implemented using Generators. So to understand how Async really
+works we need to understand generators first. Generators in Rust are implemented
+as state machines. The memory footprint of a chain of computations is only
+defined by the largest footprint of what the largest step require. </p>
+<p>That means that adding steps to a chain of computations might not require any
+increased memory at all and it's one of the reasons why Futures and Async in
+Rust has very little overhead.</p>
 <h2><a class="header" href="#how-generators-work" id="how-generators-work">How generators work</a></h2>
 <p>In Nightly Rust today you can use the <code>yield</code> keyword. Basically using this
 keyword in a closure, converts it to a generator. A closure could look like this
@@ -1129,19 +1127,17 @@ impl Generator for GeneratorA {
         match std::mem::replace(&amp;mut *self, GeneratorA::Exit) {
             GeneratorA::Enter(a1) =&gt; {
 
-          /*|---code before yield---|*/
-          /*|*/ println!(&quot;Hello&quot;); /*|*/ 
-          /*|*/ let a = a1 * 2;    /*|*/
-          /*|------------------------|*/
+          /*----code before yield----*/
+                println!(&quot;Hello&quot;);
+                let a = a1 * 2;
 
                 *self = GeneratorA::Yield1(a);
                 GeneratorState::Yielded(a)
             }
-            GeneratorA::Yield1(_) =&gt; {
 
-          /*|----code after yield----|*/
-          /*|*/ println!(&quot;world!&quot;); /*|*/ 
-          /*|-------------------------|*/
+            GeneratorA::Yield1(_) =&gt; {
+          /*-----code after yield-----*/
+                println!(&quot;world!&quot;);
 
                 *self = GeneratorA::Exit;
                 GeneratorState::Complete(())
@@ -1167,23 +1163,34 @@ limitation just slip and call it a day yet.</p>
 <p>We'll use the optimized version of the state machines which is used in Rust today. For a more
 in depth explanation see <a href="https://tmandry.gitlab.io/blog/posts/optimizing-await-1/">Tyler Mandry's excellent article: How Rust optimizes async/await</a></p>
 </blockquote>
-<pre><code class="language-rust noplaypen ignore">let mut gen = move || {
+<pre><code class="language-rust noplaypen ignore">let mut generator = move || {
         let to_borrow = String::from(&quot;Hello&quot;);
         let borrowed = &amp;to_borrow;
         yield borrowed.len();
         println!(&quot;{} world!&quot;, borrowed);
     };
 </code></pre>
+<p>We'll be hand-coding some versions of a state-machines representing a state
+machine for the generator defined aboce.</p>
+<p>We step through each step &quot;manually&quot; in every example, so it looks pretty
+unfamiliar. We could add some syntactic sugar like implementing the <code>Iterator</code>
+trait for our generators which would let us do this:</p>
+<pre><pre class="playpen"><code class="language-rust ingore">
+# #![allow(unused_variables)]
+#fn main() {
+for val in generator {
+    println!(&quot;{}&quot;, val);
+}
+#}</code></pre></pre>
+<p>It's a pretty trivial change to make, but this chapter is already getting long.
+Just keep this in the back of your head as we move forward.</p>
 <p>Now what does our rewritten state machine look like with this example?</p>
 <pre><pre class="playpen"><code class="language-rust compile_fail">
 # #![allow(unused_variables)]
 #fn main() {
-# // If you've ever wondered why the parameters are called Y and R the naming from
-# // the original rfc most likely holds the answer
 # enum GeneratorState&lt;Y, R&gt; {
-#     // originally called `CoResult`
-#     Yielded(Y),  // originally called `Yield(Y)`
-#     Complete(R), // originally called `Return(R)`
+#     Yielded(Y), 
+#     Complete(R),
 # }
 # 
 # trait Generator {
@@ -1215,7 +1222,7 @@ impl Generator for GeneratorA {
         match std::mem::replace(&amp;mut *self, GeneratorA::Exit) {
             GeneratorA::Enter =&gt; {
                 let to_borrow = String::from(&quot;Hello&quot;);
-                let borrowed = &amp;to_borrow;
+                let borrowed = &amp;to_borrow; // &lt;--- NB!
                 let res = borrowed.len();
 
                 *self = GeneratorA::Yield1 {to_borrow, borrowed};
@@ -1241,30 +1248,9 @@ to make this work, we'll have to let the compiler know that <em>we</em> control
 see we end up in a <em>self referential struct</em>. A struct which holds references
 into itself.</p>
 <p>As you'll notice, this compiles just fine!</p>
-<pre><pre class="playpen"><code class="language-rust editable">pub fn main() {
-    let mut gen = GeneratorA::start();
-    let mut gen2 = GeneratorA::start();
-
-    if let GeneratorState::Yielded(n) = gen.resume() {
-        println!(&quot;Got value {}&quot;, n);
-    }
-    
-    // If you uncomment this, very bad things can happen. This is why we need `Pin`
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-
-    if let GeneratorState::Yielded(n) = gen2.resume() {
-        println!(&quot;Got value {}&quot;, n);
-    }
-
-    // if you uncomment `mem::swap`.. this should now start gen2.
-    if let GeneratorState::Complete(()) = gen.resume() {
-        ()
-    };
-}
-
-enum GeneratorState&lt;Y, R&gt; {
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
+<pre><code class="language-rust ignore">enum GeneratorState&lt;Y, R&gt; {
+    Yielded(Y),  
+    Complete(R), 
 }
 
 trait Generator {
@@ -1277,7 +1263,7 @@ enum GeneratorA {
     Enter,
     Yield1 {
         to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
+        borrowed: *const String,
     },
     Exit,
 }
@@ -1291,20 +1277,18 @@ impl Generator for GeneratorA {
     type Yield = usize;
     type Return = ();
     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
-        // lets us get ownership over current state
             match self {
             GeneratorA::Enter =&gt; {
                 let to_borrow = String::from(&quot;Hello&quot;);
                 let borrowed = &amp;to_borrow;
                 let res = borrowed.len();
-
-                // Trick to actually get a self reference
                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match self {
-                 GeneratorA::Yield1{to_borrow, borrowed} =&gt; *borrowed = to_borrow,
-                 _ =&gt; unreachable!(),  
-                };
-
+                
+                // We set the self-reference here
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+               
                 GeneratorState::Yielded(res)
             }
 
@@ -1318,137 +1302,172 @@ impl Generator for GeneratorA {
         }
     }
 }
-</code></pre></pre>
-<blockquote>
-<p>Try to uncomment the line with <code>mem::swap</code> and see the results.</p>
-</blockquote>
-<p>While the example above compiles just fine, we expose consumers of this this API 
-to both possible undefined behavior and other memory errors while using just safe
-Rust. This is a big problem!</p>
-<p>But now, let's prevent this problem using <code>Pin</code>. We'll discuss
-<code>Pin</code> more in the next chapter, but you'll get an introduction here by just
-reading the comments.</p>
-<pre><pre class="playpen"><code class="language-rust editable">#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
-use std::pin::Pin;
-
-pub fn main() {
-    let gen1 = GeneratorA::start();
-    let gen2 = GeneratorA::start();
-    // Before we pin the pointers, this is safe to do
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-
-    // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe.
-    // However, as you'll see in the start of the next chapter value pinned to
-    // heap can be constructed while staying in safe Rust so we can use
-    // that to avoid unsafe. You can also use crates like `pin_utils` to do 
-    // this safely, just remember that they use unsafe under the hood so it's 
-    // like using an already-reviewed unsafe implementation.
-
-    let mut pinned1 = Box::pin(gen1);
-    let mut pinned2 = Box::pin(gen2);
-    // Uncomment these if you think it's safe to pin the values to the stack instead 
-    // (it is in this case). Remember to comment out the two previous lines first.
-    //let mut pinned1 = unsafe { Pin::new_unchecked(&amp;mut gen1) };
-    //let mut pinned2 = unsafe { Pin::new_unchecked(&amp;mut gen2) };
-
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
-        println!(&quot;Gen1 got value {}&quot;, n);
-    }
-    
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
-        println!(&quot;Gen2 got value {}&quot;, n);
+</code></pre>
+<p>Remember that our example is the generator we crated which looked like this:</p>
+<pre><code class="language-rust noplaypen ignore">let mut gen = move || {
+        let to_borrow = String::from(&quot;Hello&quot;);
+        let borrowed = &amp;to_borrow;
+        yield borrowed.len();
+        println!(&quot;{} world!&quot;, borrowed);
     };
+</code></pre>
+<p>Below is an example of how we could run this state-machine. But there is still
+one huge problem with this:</p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
 
-    // This won't work
-    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
-    // This will work but will just swap the pointers. Nothing inherently bad happens here.
-    // std::mem::swap(&amp;mut pinned1, &amp;mut pinned2);
-
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
-}
-
-enum GeneratorState&lt;Y, R&gt; {
-    // originally called `CoResult`
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
-}
-
-trait Generator {
-    type Yield;
-    type Return;
-    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
-}
-
-enum GeneratorA {
-    Enter,
-    Yield1 {
-        to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
-    },
-    Exit,
-}
-
-impl GeneratorA {
-    fn start() -&gt; Self {
-        GeneratorA::Enter
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!(&quot;Got value {}&quot;, n);
     }
-}
 
-// This tells us that the underlying pointer is not safe to move after pinning. In this case,
-// only we as implementors &quot;feel&quot; this, however, if someone is relying on our Pinned pointer
-// this will prevent them from moving it. You need to enable the feature flag 
-// `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.
-// Normally, you would use `std::marker::PhantomPinned` to indicate that the
-// struct is `!Unpin`.
-impl !Unpin for GeneratorA { }
-
-impl Generator for GeneratorA {
-    type Yield = usize;
-    type Return = ();
-    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
-        // lets us get ownership over current state
-        let this = unsafe { self.get_unchecked_mut() };
-            match this {
-            GeneratorA::Enter =&gt; {
-                let to_borrow = String::from(&quot;Hello&quot;);
-                let borrowed = &amp;to_borrow;
-                let res = borrowed.len();
-
-                // Trick to actually get a self reference. We can't reference
-                // the `String` earlier since these references will point to the
-                // location in this stack frame which will not be valid anymore
-                // when this function returns.
-                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match this {
-                 GeneratorA::Yield1{to_borrow, borrowed} =&gt; *borrowed = to_borrow,
-                 _ =&gt; unreachable!(),  
-                };
-
-                GeneratorState::Yielded(res)
-            }
-
-            GeneratorA::Yield1 {borrowed, ..} =&gt; {
-                let borrowed: &amp;String = unsafe {&amp;**borrowed};
-                println!(&quot;{} world&quot;, borrowed);
-                *this = GeneratorA::Exit;
-                GeneratorState::Complete(())
-            }
-            GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
-        }
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!(&quot;Got value {}&quot;, n);
     }
+
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
 }
+# enum GeneratorState&lt;Y, R&gt; {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -&gt; Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+#             match self {
+#             GeneratorA::Enter =&gt; {
+#                 let to_borrow = String::from(&quot;Hello&quot;);
+#                 let borrowed = &amp;to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} =&gt; {
+#                 let borrowed: &amp;String = unsafe {&amp;**borrowed};
+#                 println!(&quot;{} world&quot;, borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+#         }
+#     }
+# }
 </code></pre></pre>
-<p>Now, as you see, the consumer of this API must either:</p>
-<ol>
-<li>Box the value and thereby allocating it on the heap</li>
-<li>Use <code>unsafe</code> and pin the value to the stack. The user knows that if they move
-the value afterwards it will violate the guarantee they promise to uphold when
-they did their unsafe implementation.</li>
-</ol>
-<p>Hopefully, after this you'll have an idea of what happens when you use the
-<code>yield</code> or <code>await</code> keywords inside an async function, and why we need <code>Pin</code> if
-we want to be able to safely borrow across <code>yield/await</code> points.</p>
+<p>The problem however is that in safe Rust we can still do this:</p>
+<p><em>Run the code and compare the results. Do you see the problem?</em></p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
+
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!(&quot;Got value {}&quot;, n);
+    }
+
+    std::mem::swap(&amp;mut gen, &amp;mut gen2); // &lt;--- Big problem!
+
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!(&quot;Got value {}&quot;, n);
+    }
+
+    // This would now start gen2 since we swapped them.
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
+}
+# enum GeneratorState&lt;Y, R&gt; {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -&gt; Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&amp;mut self) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+#             match self {
+#             GeneratorA::Enter =&gt; {
+#                 let to_borrow = String::from(&quot;Hello&quot;);
+#                 let borrowed = &amp;to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} =&gt; {
+#                 let borrowed: &amp;String = unsafe {&amp;**borrowed};
+#                 println!(&quot;{} world&quot;, borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+#         }
+#     }
+# }
+</code></pre></pre>
+<p>Wait? What happened to &quot;Hello&quot;?</p>
+<p>Turns out that while the example above compiles
+just fine, we expose consumers of this this API to both possible undefined
+behavior and other memory errors while using just safe Rust. This is a big
+problem!</p>
+<p>We'll explain exactly what happened using a slightly simpler example in the next
+chapter and we'll fix our generator using <code>Pin</code> so join me as we explore
+the last topic before we implement our main Futures example.</p>
 <h2><a class="header" href="#bonus-section---self-referential-generators-in-rust-today" id="bonus-section---self-referential-generators-in-rust-today">Bonus section - self referential generators in Rust today</a></h2>
 <p>Thanks to <a href="https://github.com/rust-lang/rust/pull/45337/files">PR#45337</a> you can actually run code like the one in our
 example in Rust today using the <code>static</code> keyword on nightly. Try it for
@@ -1489,99 +1508,53 @@ pub fn main() {
 </code></pre></pre>
 <h1><a class="header" href="#pin" id="pin">Pin</a></h1>
 <blockquote>
-<p><strong>Relevant for</strong></p>
+<p><strong>Overview</strong></p>
 <ol>
-<li>Understanding <code>Generators</code> and <code>Futures</code></li>
-<li>Knowing how to use <code>Pin</code> is required when implementing your own <code>Future</code></li>
-<li>Understanding how to make self-referential types safe to use in Rust</li>
-<li>Learning how borrowing across <code>await</code> points is accomplished</li>
+<li>Learn how to use <code>Pin</code> and why it's required when implementing your own <code>Future</code></li>
+<li>Understand how to make self-referential types safe to use in Rust</li>
+<li>Learn how borrowing across <code>await</code> points is accomplished</li>
+<li>Get a set of practical rules to help you work with <code>Pin</code></li>
 </ol>
 <p><code>Pin</code> was suggested in <a href="https://github.com/rust-lang/rfcs/blob/master/text/2349-pin.md">RFC#2349</a></p>
 </blockquote>
-<p>We already got a brief introduction of <code>Pin</code> in the previous chapters, so we'll
-start off without any further introduction.</p>
-<p>Let's jump strait to some definitions and then create 10 rules to remember when
-we work with <code>Pin</code>.</p>
+<p>Let's jump strait to it. Pinning is one of those subjects which is hard to wrap
+your head around in the start, but once you unlock a mental model for it
+it gets significantly easier to reason about.</p>
 <h2><a class="header" href="#definitions" id="definitions">Definitions</a></h2>
+<p>Pin is only relevant for pointers. A reference to an object is a pointer.</p>
 <p>Pin consists of the <code>Pin</code> type and the <code>Unpin</code> marker. Pin's purpose in life is
 to govern the rules that need to apply for types which implement <code>!Unpin</code>.</p>
-<p>Pin is only relevant for pointers. A reference to an object is a pointer.</p>
 <p>Yep, you're right, that's double negation right there. <code>!Unpin</code> means
 &quot;not-un-pin&quot;.</p>
-<p><em>This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by
-<code>!Unpin</code> it's a good sign that it's time to lay down the work and start over
-tomorrow with a fresh mind.</em></p>
 <blockquote>
-<p>On a more serious note, I feel obliged to mention that there are valid reasons for the names
-that were chosen. If you want to you can read a bit of the discussion from the
-<a href="https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12">internals thread</a>. One of the best takeaways from there in my eyes
-is this quote from <code>tmandry</code>:</p>
-<p><em>Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful.</em></p>
+<p><em>This naming scheme is one of Rusts safety features where it deliberately
+tests if you're too tired to safely implement a type with this marker. If
+you're starting to get confused, or even angry, by <code>!Unpin</code> it's a good sign
+that it's time to lay down the work and start over tomorrow with a fresh mind.</em></p>
 </blockquote>
-<p>For the next paragraph we'll rename these markers to:</p>
+<p>On a more serious note, I feel obliged to mention that there are valid reasons
+for the names that were chosen. Naming is not easy, and I considered renaming
+<code>Unpin</code> and <code>!Unpin</code> in this book to make them easier to reason about. </p>
+<p>However, an experienced member of the Rust community convinced me that that there
+is just too many nuances and edge-cases to consider which is easily overlooked when
+naively giving these markers different names, and I'm convinced that we'll
+just have to get used to them and use them as is.</p>
+<p>If you want to you can read a bit of the discussion from the
+<a href="https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12">internals thread</a>. One of the best takeaways from there in my
+eyes is this quote from <code>tmandry</code>:</p>
 <blockquote>
-<p><code>!Unpin</code> = <code>MustStay</code> and <code>Unpin</code> = <code>CanMove</code></p>
+<p><em>Think of taking a thumbtack out of a cork board so you can tweak how a flyer
+looks. For Unpin types, this unpinning is directly supported by the type; you
+can do this implicitly. You can even swap out the object with another before you
+put the pin back. For other types, you must be much more careful.</em></p>
 </blockquote>
-<p>It just makes it much easier to talk about them.</p>
-<h2><a class="header" href="#rules-to-remember" id="rules-to-remember">Rules to remember</a></h2>
-<ol>
-<li>
-<p>If <code>T: CanMove</code> (which is the default), then <code>Pin&lt;'a, T&gt;</code> is entirely equivalent to <code>&amp;'a mut T</code>. in other words: <code>CanMove</code> means it's OK for this type to be moved even when pinned, so <code>Pin</code> will have no effect on such a type.</p>
-</li>
-<li>
-<p>Getting a <code>&amp;mut T</code> to a pinned pointer requires unsafe if <code>T: MustStay</code>. In other words: requiring a pinned pointer to a type which is <code>MustStay</code> prevents the <em>user</em> of that API from moving that value unless it choses to write <code>unsafe</code> code.</p>
-</li>
-<li>
-<p>Pinning does nothing special with memory allocation like putting it into some &quot;read only&quot; memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden.</p>
-</li>
-<li>
-<p>Most standard library types implement <code>CanMove</code>. The same goes for most
-&quot;normal&quot; types you encounter in Rust. <code>Futures</code> and <code>Generators</code> are two
-exceptions.</p>
-</li>
-<li>
-<p>The main use case for <code>Pin</code> is to allow self referential types, the whole
-justification for stabilizing them was to allow that. There are still corner
-cases in the API which are being explored.</p>
-</li>
-<li>
-<p>The implementation behind objects that are <code>MustStay</code> is most likely unsafe.
-Moving such a type can cause the universe to crash. As of the time of writing
-this book, creating and reading fields of a self referential struct still requires <code>unsafe</code>.</p>
-</li>
-<li>
-<p>You can add a <code>MustStay</code> bound on a type on nightly with a feature flag, or
-by adding <code>std::marker::PhantomPinned</code> to your type on stable.</p>
-</li>
-<li>
-<p>You can either pin a value to memory on the stack or on the heap.</p>
-</li>
-<li>
-<p>Pinning a <code>MustStay</code> pointer to the stack requires <code>unsafe</code></p>
-</li>
-<li>
-<p>Pinning a <code>MustStay</code> pointer to the heap does not require <code>unsafe</code>. There is a shortcut for doing this using <code>Box::pin</code>.</p>
-</li>
-</ol>
-<blockquote>
-<p>Unsafe code does not mean it's literally &quot;unsafe&quot;, it only relieves the 
-guarantees you normally get from the compiler. An <code>unsafe</code> implementation can 
-be perfectly safe to do, but you have no safety net.</p>
-</blockquote>
-<p>Let's take a look at an example:</p>
-<pre><pre class="playpen"><code class="language-rust editable">use std::pin::Pin;
-
-fn main() {
-    let mut test1 = Test::new(&quot;test1&quot;);
-    test1.init();
-    let mut test2 = Test::new(&quot;test2&quot;);
-    test2.init();
-
-    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
-    std::mem::swap(&amp;mut test1, &amp;mut test2); // try commenting out this line
-    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
-
-}
+<h2><a class="header" href="#pinning-and-self-referential-structs" id="pinning-and-self-referential-structs">Pinning and self-referential structs</a></h2>
+<p>Let's start where we left off in the last chapter by making the problem we
+saw using a self-referential struct in our generator a lot simpler by making
+some self-referential structs that are easier to reason about than our
+state machines:</p>
+<p>For now our example will look like this:</p>
+<pre><code class="language-rust ignore">use std::pin::Pin;
 
 #[derive(Debug)]
 struct Test {
@@ -1597,7 +1570,7 @@ impl Test {
             b: std::ptr::null(),
         }
     }
-    
+
     fn init(&amp;mut self) {
         let self_ref: *const String = &amp;self.a;
         self.b = self_ref;
@@ -1611,7 +1584,7 @@ impl Test {
         unsafe {&amp;*(self.b)}
     }
 }
-</code></pre></pre>
+</code></pre>
 <p>Let's walk through this example since we'll be using it the rest of this chapter.</p>
 <p>We have a self-referential struct <code>Test</code>. <code>Test</code> needs an <code>init</code> method to be
 created which is strange but we'll need that to keep this example as short as
@@ -1619,25 +1592,165 @@ possible.</p>
 <p><code>Test</code> provides two methods to get a reference to the value of the fields
 <code>a</code> and <code>b</code>. Since <code>b</code> is a reference to <code>a</code> we store it as a pointer since
 the borrowing rules of Rust doesn't allow us to define this lifetime.</p>
+<p>Now, let's use this example to explain the problem we encounter in detail. As
+you see, this works as expected:</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     // We need an `init` method to actually set our self-reference
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
 <p>In our main method we first instantiate two instances of <code>Test</code> and print out
-the value of the fields on <code>test1</code>. We get:</p>
+the value of the fields on <code>test1</code>. We get what we'd expect:</p>
 <pre><code class="language-rust ignore">a: test1, b: test1
+a: test2, b: test2
 </code></pre>
-<p>Next we swap the data stored at the memory location which <code>test1</code> is pointing to
-with the data stored at the memory location <code>test2</code> is pointing to and vice a versa.</p>
-<p>We should expect that printing the fields of <code>test2</code> should display the same as
-<code>test1</code> (since the object we printed before the swap has moved there now).</p>
-<pre><code class="language-rust ignore">a: test1, b: test2
+<p>Let's see what happens if we swap the data stored at the memory location
+which <code>test1</code> is pointing to with the data stored at the memory location
+<code>test2</code> is pointing to and vice a versa.</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    std::mem::swap(&amp;mut test1, &amp;mut test2);
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
+<p>Naively, we could think that what we should get a debug print of <code>test1</code> two
+times like this</p>
+<pre><code class="language-rust ignore">a: test1, b: test1
+a: test1, b: test1
 </code></pre>
-<p>The pointer to <code>b</code> still points to the old location. That location is now
-occupied with the string &quot;test2&quot;. This can be a bit hard to visualize so I made
-a figure that i hope can help.</p>
+<p>But instead we get:</p>
+<pre><code class="language-rust ignore">a: test1, b: test1
+a: test1, b: test2
+</code></pre>
+<p>The pointer to <code>test2.b</code> still points to the old location which is inside <code>test1</code>
+now. The struct is not self-referential anymore, it holds a pointer to a field
+in a different object. That means we can't rely on the lifetime of <code>test2.b</code> to
+be tied to the lifetime of <code>test2</code> anymore.</p>
+<p>If your still not convinced, this should at least convince you:</p>
+<pre><pre class="playpen"><code class="language-rust">fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+
+    println!(&quot;a: {}, b: {}&quot;, test1.a(), test1.b());
+    std::mem::swap(&amp;mut test1, &amp;mut test2);
+    test1.a = &quot;I've totally changed now!&quot;.to_string();
+    println!(&quot;a: {}, b: {}&quot;, test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&amp;mut self) {
+#         let self_ref: *const String = &amp;self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&amp;self) -&gt; &amp;str {
+#         &amp;self.a
+#     } 
+#     
+#     fn b(&amp;self) -&gt; &amp;String {
+#         unsafe {&amp;*(self.b)}
+#     }
+# }
+</code></pre></pre>
+<p>That shouldn't happen. There is no serious error yet, but as you can imagine
+it's easy to create serious bugs using this code.</p>
+<p>I created a diagram to help visualize what's going on:</p>
 <p><strong>Fig 1: Before and after swap</strong>
 <img src="./assets/swap_problem.jpg" alt="swap_problem" /></p>
 <p>As you can see this results in unwanted behavior. It's easy to get this to 
 segfault, show UB and fail in other spectacular ways as well.</p>
-<p>If we change the example to using <code>Pin</code> instead:</p>
-<pre><pre class="playpen"><code class="language-rust editable">use std::pin::Pin;
+<h2><a class="header" href="#pinning-to-the-stack" id="pinning-to-the-stack">Pinning to the stack</a></h2>
+<p>Now, we can solve this problem by using <code>Pin</code> instead. Let's take a look at what
+our example would look like then:</p>
+<pre><code class="language-rust ignore">use std::pin::Pin;
 use std::marker::PhantomPinned;
 
 #[derive(Debug)]
@@ -1671,8 +1784,14 @@ impl Test {
         unsafe { &amp;*(self.b) }
     }
 }
-
-pub fn main() {
+</code></pre>
+<p>Now, what we've done here is pinning a stack address. That will always be
+<code>unsafe</code> if our type implements <code>!Unpin</code>.</p>
+<p>We use the same tricks here, including requiring an <code>init</code>. If we want to fix that
+and let users avoid <code>unsafe</code> we need to pin our data on the heap instead which
+we'll show in a second.</p>
+<p>Let's see what happens if we run our example now:</p>
+<pre><pre class="playpen"><code class="language-rust">pub fn main() {
     let mut test1 = Test::new(&quot;test1&quot;);
     test1.init();
     let mut test1_pin = unsafe { Pin::new_unchecked(&amp;mut test1) }; 
@@ -1680,33 +1799,103 @@ pub fn main() {
     test2.init();
     let mut test2_pin = unsafe { Pin::new_unchecked(&amp;mut test2) };
 
-    println!(
-        &quot;a: {}, b: {}&quot;,
-        Test::a(test1_pin.as_ref()),
-        Test::b(test1_pin.as_ref())
-    );
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
-    println!(
-        &quot;a: {}, b: {}&quot;,
-        Test::a(test2_pin.as_ref()),
-        Test::b(test2_pin.as_ref())
-    );
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
 }
-
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&amp;mut self) {
+#         let self_ptr: *const String = &amp;self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a str {
+#         &amp;self.get_ref().a
+#     }
+# 
+#     fn b&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a String {
+#         unsafe { &amp;*(self.b) }
+#     }
+# }
+</code></pre></pre>
+<p>Now, if we try to pull the same trick which got us in to trouble the last time
+you'll get a compilation error. So t</p>
+<pre><pre class="playpen"><code class="language-rust compile_fail">pub fn main() {
+    let mut test1 = Test::new(&quot;test1&quot;);
+    test1.init();
+    let mut test1_pin = unsafe { Pin::new_unchecked(&amp;mut test1) }; 
+    let mut test2 = Test::new(&quot;test2&quot;);
+    test2.init();
+    let mut test2_pin = unsafe { Pin::new_unchecked(&amp;mut test2) };
+
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
+    println!(&quot;a: {}, b: {}&quot;, Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
+}
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &amp;str) -&gt; Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&amp;mut self) {
+#         let self_ptr: *const String = &amp;self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a str {
+#         &amp;self.get_ref().a
+#     }
+# 
+#     fn b&lt;'a&gt;(self: Pin&lt;&amp;'a Self&gt;) -&gt; &amp;'a String {
+#         unsafe { &amp;*(self.b) }
+#     }
+# }
 </code></pre></pre>
-<p>Now, what we've done here is pinning a stack address. That will always be
-<code>unsafe</code> if our type implements <code>!Unpin</code> (aka <code>MustStay</code>).</p>
-<p>We use some tricks here, including requiring an <code>init</code>. If we want to fix that
-and let users avoid <code>unsafe</code> we need to pin our data on the heap instead.</p>
 <blockquote>
-<p>Stack pinning will always depend on the current stack frame we're in, so we
-can't create a self referential object in one stack frame and return it since
-any pointers we take to &quot;self&quot; is invalidated.</p>
+<p>It's important to note that stack pinning will always depend on the current
+stack frame we're in, so we can't create a self referential object in one
+stack frame and return it since any pointers we take to &quot;self&quot; is invalidated.</p>
 </blockquote>
-<p>The next example solves some of our friction at the cost of a heap allocation.</p>
-<pre><pre class="playpen"><code class="language-rust editbable">use std::pin::Pin;
+<h2><a class="header" href="#pinning-to-the-heap" id="pinning-to-the-heap">Pinning to the heap</a></h2>
+<p>For completeness let's remove some unsafe and the need for an <code>init</code> method
+at the cost of a heap allocation. Pinning to the heap is safe so the user
+doesn't need to implement any unsafe code:</p>
+<pre><pre class="playpen"><code class="language-rust">use std::pin::Pin;
 use std::marker::PhantomPinned;
 
 #[derive(Debug)]
@@ -1745,9 +1934,6 @@ pub fn main() {
     let mut test2 = Test::new(&quot;test2&quot;);
 
     println!(&quot;a: {}, b: {}&quot;,test1.as_ref().a(), test1.as_ref().b());
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(&amp;mut test1, &amp;mut test2);
     println!(&quot;a: {}, b: {}&quot;,test2.as_ref().a(), test2.as_ref().b());
 }
 </code></pre></pre>
@@ -1757,6 +1943,58 @@ makes sense. Once the data is allocated on the heap it will have a stable addres
 that the self-referential pointer stays valid.</p>
 <p>There are ways to safely give some guarantees on stack pinning as well, but right
 now you need to use a crate like <a href="https://docs.rs/pin-project/">pin_project</a> to do that.</p>
+<h2><a class="header" href="#practical-rules-for-pinning" id="practical-rules-for-pinning">Practical rules for Pinning</a></h2>
+<ol>
+<li>
+<p>If <code>T: Unpin</code> (which is the default), then <code>Pin&lt;'a, T&gt;</code> is entirely
+equivalent to <code>&amp;'a mut T</code>. in other words: <code>Unpin</code> means it's OK for this type
+to be moved even when pinned, so <code>Pin</code> will have no effect on such a type.</p>
+</li>
+<li>
+<p>Getting a <code>&amp;mut T</code> to a pinned pointer requires unsafe if <code>T: !Unpin</code>. In
+other words: requiring a pinned pointer to a type which is <code>!Unpin</code> prevents
+the <em>user</em> of that API from moving that value unless it choses to write <code>unsafe</code>
+code.</p>
+</li>
+<li>
+<p>Pinning does nothing special with memory allocation like putting it into some
+&quot;read only&quot; memory or anything fancy. It only tells the compiler that some
+operations on this value should be forbidden.</p>
+</li>
+<li>
+<p>Most standard library types implement <code>Unpin</code>. The same goes for most
+&quot;normal&quot; types you encounter in Rust. <code>Futures</code> and <code>Generators</code> are two
+exceptions.</p>
+</li>
+<li>
+<p>The main use case for <code>Pin</code> is to allow self referential types, the whole
+justification for stabilizing them was to allow that. There are still corner
+cases in the API which are being explored.</p>
+</li>
+<li>
+<p>The implementation behind objects that are <code>!Unpin</code> is most likely unsafe.
+Moving such a type can cause the universe to crash. As of the time of writing
+this book, creating and reading fields of a self referential struct still requires <code>unsafe</code>.</p>
+</li>
+<li>
+<p>You can add a <code>!Unpin</code> bound on a type on nightly with a feature flag, or
+by adding <code>std::marker::PhantomPinned</code> to your type on stable.</p>
+</li>
+<li>
+<p>You can either pin a value to memory on the stack or on the heap.</p>
+</li>
+<li>
+<p>Pinning a <code>!Unpin</code> pointer to the stack requires <code>unsafe</code></p>
+</li>
+<li>
+<p>Pinning a <code>!Unpin</code> pointer to the heap does not require <code>unsafe</code>. There is a shortcut for doing this using <code>Box::pin</code>.</p>
+</li>
+</ol>
+<blockquote>
+<p>Unsafe code does not mean it's literally &quot;unsafe&quot;, it only relieves the 
+guarantees you normally get from the compiler. An <code>unsafe</code> implementation can 
+be perfectly safe to do, but you have no safety net.</p>
+</blockquote>
 <h3><a class="header" href="#projectionstructural-pinning" id="projectionstructural-pinning">Projection/structural pinning</a></h3>
 <p>In short, projection is a programming language term. <code>mystruct.field1</code> is a
 projection. Structural pinning is using <code>Pin</code> on fields. This has several
@@ -1769,6 +2007,130 @@ extra care must be taken when implementing <code>Drop</code> for pinned types.</
 <h2><a class="header" href="#putting-it-all-together" id="putting-it-all-together">Putting it all together</a></h2>
 <p>This is exactly what we'll do when we implement our own <code>Futures</code> stay tuned, 
 we're soon finished.</p>
+<h2><a class="header" href="#bonus-section-fixing-our-self-referential-generator-and-learning-more-about-pin" id="bonus-section-fixing-our-self-referential-generator-and-learning-more-about-pin">Bonus section: Fixing our self-referential generator and learning more about Pin</a></h2>
+<p>But now, let's prevent this problem using <code>Pin</code>. We'll discuss
+<code>Pin</code> more in the next chapter, but you'll get an introduction here by just
+reading the comments.</p>
+<pre><pre class="playpen"><code class="language-rust">#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
+use std::pin::Pin;
+
+pub fn main() {
+    let gen1 = GeneratorA::start();
+    let gen2 = GeneratorA::start();
+    // Before we pin the pointers, this is safe to do
+    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
+
+    // constructing a `Pin::new()` on a type which does not implement `Unpin` is
+    // unsafe. A value pinned to heap can be constructed while staying in safe
+    // Rust so we can use that to avoid unsafe. You can also use crates like
+    // `pin_utils` to pin to the stack safely, just remember that they use
+    // unsafe under the hood so it's like using an already-reviewed unsafe
+    // implementation.
+
+    let mut pinned1 = Box::pin(gen1);
+    let mut pinned2 = Box::pin(gen2);
+
+    // Uncomment these if you think it's safe to pin the values to the stack instead 
+    // (it is in this case). Remember to comment out the two previous lines first.
+    //let mut pinned1 = unsafe { Pin::new_unchecked(&amp;mut gen1) };
+    //let mut pinned2 = unsafe { Pin::new_unchecked(&amp;mut gen2) };
+
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+        println!(&quot;Gen1 got value {}&quot;, n);
+    }
+    
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+        println!(&quot;Gen2 got value {}&quot;, n);
+    };
+
+    // This won't work:
+    // std::mem::swap(&amp;mut gen, &amp;mut gen2);
+    // This will work but will just swap the pointers so nothing bad happens here:
+    // std::mem::swap(&amp;mut pinned1, &amp;mut pinned2);
+
+    let _ = pinned1.as_mut().resume();
+    let _ = pinned2.as_mut().resume();
+}
+
+enum GeneratorState&lt;Y, R&gt; {
+    Yielded(Y),  
+    Complete(R), 
+}
+
+trait Generator {
+    type Yield;
+    type Return;
+    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt;;
+}
+
+enum GeneratorA {
+    Enter,
+    Yield1 {
+        to_borrow: String,
+        borrowed: *const String,
+    },
+    Exit,
+}
+
+impl GeneratorA {
+    fn start() -&gt; Self {
+        GeneratorA::Enter
+    }
+}
+
+// This tells us that the underlying pointer is not safe to move after pinning.
+// In this case, only we as implementors &quot;feel&quot; this, however, if someone is
+// relying on our Pinned pointer this will prevent them from moving it. You need
+// to enable the feature flag `#![feature(optin_builtin_traits)]` and use the
+// nightly compiler to implement `!Unpin`. Normally, you would use
+// `std::marker::PhantomPinned` to indicate that the struct is `!Unpin`.
+impl !Unpin for GeneratorA { }
+
+impl Generator for GeneratorA {
+    type Yield = usize;
+    type Return = ();
+    fn resume(self: Pin&lt;&amp;mut Self&gt;) -&gt; GeneratorState&lt;Self::Yield, Self::Return&gt; {
+        // lets us get ownership over current state
+        let this = unsafe { self.get_unchecked_mut() };
+            match this {
+            GeneratorA::Enter =&gt; {
+                let to_borrow = String::from(&quot;Hello&quot;);
+                let borrowed = &amp;to_borrow;
+                let res = borrowed.len();
+                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+
+                // Trick to actually get a self reference. We can't reference
+                // the `String` earlier since these references will point to the
+                // location in this stack frame which will not be valid anymore
+                // when this function returns.
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+
+                GeneratorState::Yielded(res)
+            }
+
+            GeneratorA::Yield1 {borrowed, ..} =&gt; {
+                let borrowed: &amp;String = unsafe {&amp;**borrowed};
+                println!(&quot;{} world&quot;, borrowed);
+                *this = GeneratorA::Exit;
+                GeneratorState::Complete(())
+            }
+            GeneratorA::Exit =&gt; panic!(&quot;Can't advance an exited generator!&quot;),
+        }
+    }
+}
+</code></pre></pre>
+<p>Now, as you see, the consumer of this API must either:</p>
+<ol>
+<li>Box the value and thereby allocating it on the heap</li>
+<li>Use <code>unsafe</code> and pin the value to the stack. The user knows that if they move
+the value afterwards it will violate the guarantee they promise to uphold when
+they did their unsafe implementation.</li>
+</ol>
+<p>Hopefully, after this you'll have an idea of what happens when you use the
+<code>yield</code> or <code>await</code> keywords inside an async function, and why we need <code>Pin</code> if
+we want to be able to safely borrow across <code>yield/await</code> points.</p>
 <h1><a class="header" href="#futures-in-rust-1" id="futures-in-rust-1">Futures in Rust</a></h1>
 <p>We'll create our own <code>Futures</code> together with a fake reactor and a simple
 executor which allows you to edit, run an play around with the code right here
diff --git a/book/searchindex.js b/book/searchindex.js
index 699e83f..0b99a2f 100644
--- a/book/searchindex.js
+++ b/book/searchindex.js
@@ -1 +1 @@
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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Overview: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Overview: Understandi how the async/await syntax works since it's how await is implemented Know why we need Pin Understand why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators. We covered green threads in the background information so we won't repeat that here. We'll concentrate on the variants of stackless coroutines which Rust uses today.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Async in Rust is implemented using Generators. So to understand how Async really works we need to understand generators first. Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of what the largest step require. That means that adding steps to a chain of computations might not require any increased memory at all and it's one of the reasons why Futures and Async in Rust has very little overhead.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*----code before yield----*/ println!(\"Hello\"); let a = a1 * 2; *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*-----code after yield-----*/ println!(\"world!\"); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut generator = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; We'll be hand-coding some versions of a state-machines representing a state machine for the generator defined aboce. We step through each step \"manually\" in every example, so it looks pretty unfamiliar. We could add some syntactic sugar like implementing the Iterator trait for our generators which would let us do this: for val in generator { println!(\"{}\", val);\n} It's a pretty trivial change to make, but this chapter is already getting long. Just keep this in the back of your head as we move forward. Now what does our rewritten state machine look like with this example? # enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R),\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; // <--- NB! let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! enum GeneratorState<Y, R> { Yielded(Y), Complete(R), } trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; // We set the self-reference here if let GeneratorA::Yield1 {to_borrow, borrowed} = self { *borrowed = to_borrow; } GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Remember that our example is the generator we crated which looked like this: let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Below is an example of how we could run this state-machine. But there is still one huge problem with this: pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n}\n# enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R), # }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# }\n# # enum GeneratorA {\n# Enter,\n# Yield1 {\n# to_borrow: String,\n# borrowed: *const String,\n# },\n# Exit,\n# }\n# # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# }\n# impl Generator for GeneratorA {\n# type Yield = usize;\n# type Return = ();\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {\n# match self {\n# GeneratorA::Enter => {\n# let to_borrow = String::from(\"Hello\");\n# let borrowed = &to_borrow;\n# let res = borrowed.len();\n# *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};\n# # // We set the self-reference here\n# if let GeneratorA::Yield1 {to_borrow, borrowed} = self {\n# *borrowed = to_borrow;\n# }\n# # GeneratorState::Yielded(res)\n# }\n# # GeneratorA::Yield1 {borrowed, ..} => {\n# let borrowed: &String = unsafe {&**borrowed};\n# println!(\"{} world\", borrowed);\n# *self = GeneratorA::Exit;\n# GeneratorState::Complete(())\n# }\n# GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"),\n# }\n# }\n# } The problem however is that in safe Rust we can still do this: Run the code and compare the results. Do you see the problem? pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } std::mem::swap(&mut gen, &mut gen2); // <--- Big problem! if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // This would now start gen2 since we swapped them. if let GeneratorState::Complete(()) = gen.resume() { () };\n}\n# enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R), # }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# }\n# # enum GeneratorA {\n# Enter,\n# Yield1 {\n# to_borrow: String,\n# borrowed: *const String,\n# },\n# Exit,\n# }\n# # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# }\n# impl Generator for GeneratorA {\n# type Yield = usize;\n# type Return = ();\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {\n# match self {\n# GeneratorA::Enter => {\n# let to_borrow = String::from(\"Hello\");\n# let borrowed = &to_borrow;\n# let res = borrowed.len();\n# *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};\n# # // We set the self-reference here\n# if let GeneratorA::Yield1 {to_borrow, borrowed} = self {\n# *borrowed = to_borrow;\n# }\n# # GeneratorState::Yielded(res)\n# }\n# # GeneratorA::Yield1 {borrowed, ..} => {\n# let borrowed: &String = unsafe {&**borrowed};\n# println!(\"{} world\", borrowed);\n# *self = GeneratorA::Exit;\n# GeneratorState::Complete(())\n# }\n# GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"),\n# }\n# }\n# } Wait? What happened to \"Hello\"? Turns out that while the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! We'll explain exactly what happened using a slightly simpler example in the next chapter and we'll fix our generator using Pin so join me as we explore the last topic before we implement our main Futures example.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Overview Learn how to use Pin and why it's required when implementing your own Future Understand how to make self-referential types safe to use in Rust Learn how borrowing across await points is accomplished Get a set of practical rules to help you work with Pin Pin was suggested in RFC#2349 Let's jump strait to it. Pinning is one of those subjects which is hard to wrap your head around in the start, but once you unlock a mental model for it it gets significantly easier to reason about.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin is only relevant for pointers. A reference to an object is a pointer. Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is one of Rusts safety features where it deliberately tests if you're too tired to safely implement a type with this marker. If you're starting to get confused, or even angry, by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. Naming is not easy, and I considered renaming Unpin and !Unpin in this book to make them easier to reason about. However, an experienced member of the Rust community convinced me that that there is just too many nuances and edge-cases to consider which is easily overlooked when naively giving these markers different names, and I'm convinced that we'll just have to get used to them and use them as is. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"Let's start where we left off in the last chapter by making the problem we saw using a self-referential struct in our generator a lot simpler by making some self-referential structs that are easier to reason about than our state machines: For now our example will look like this: use std::pin::Pin; #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. Now, let's use this example to explain the problem we encounter in detail. As you see, this works as expected: fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # // We need an `init` method to actually set our self-reference\n# fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get what we'd expect: a: test1, b: test1\na: test2, b: test2 Let's see what happens if we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } Naively, we could think that what we should get a debug print of test1 two times like this a: test1, b: test1\na: test1, b: test1 But instead we get: a: test1, b: test1\na: test1, b: test2 The pointer to test2.b still points to the old location which is inside test1 now. The struct is not self-referential anymore, it holds a pointer to a field in a different object. That means we can't rely on the lifetime of test2.b to be tied to the lifetime of test2 anymore. If your still not convinced, this should at least convince you: fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); test1.a = \"I've totally changed now!\".to_string(); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } That shouldn't happen. There is no serious error yet, but as you can imagine it's easy to create serious bugs using this code. I created a diagram to help visualize what's going on: Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well.","breadcrumbs":"Pinning and self-referential structs","id":"28","title":"Pinning and self-referential structs"},"29":{"body":"Now, we can solve this problem by using Pin instead. Let's take a look at what our example would look like then: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin. We use the same tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead which we'll show in a second. Let's see what happens if we run our example now: pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!(\"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref())); println!(\"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));\n}\n# use std::pin::Pin;\n# use std::marker::PhantomPinned;\n# # #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# _marker: PhantomPinned,\n# }\n# # # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# // This makes our type `!Unpin`\n# _marker: PhantomPinned,\n# }\n# }\n# fn init(&mut self) {\n# let self_ptr: *const String = &self.a;\n# self.b = self_ptr;\n# }\n# # fn a<'a>(self: Pin<&'a Self>) -> &'a str {\n# &self.get_ref().a\n# }\n# # fn b<'a>(self: Pin<&'a Self>) -> &'a String {\n# unsafe { &*(self.b) }\n# }\n# } Now, if we try to pull the same trick which got us in to trouble the last time you'll get a compilation error. So t pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!(\"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref())); std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!(\"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));\n}\n# use std::pin::Pin;\n# use std::marker::PhantomPinned;\n# # #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# _marker: PhantomPinned,\n# }\n# # # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# // This makes our type `!Unpin`\n# _marker: PhantomPinned,\n# }\n# }\n# fn init(&mut self) {\n# let self_ptr: *const String = &self.a;\n# self.b = self_ptr;\n# }\n# # fn a<'a>(self: Pin<&'a Self>) -> &'a str {\n# &self.get_ref().a\n# }\n# # fn b<'a>(self: Pin<&'a Self>) -> &'a String {\n# unsafe { &*(self.b) }\n# }\n# } It's important to note that stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated.","breadcrumbs":"Pinning to the stack","id":"29","title":"Pinning to the stack"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"For completeness let's remove some unsafe and the need for an init method at the cost of a heap allocation. Pinning to the heap is safe so the user doesn't need to implement any unsafe code: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Pinning to the heap","id":"30","title":"Pinning to the heap"},"31":{"body":"If T: Unpin (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: Unpin means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: !Unpin. In other words: requiring a pinned pointer to a type which is !Unpin prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement Unpin. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are !Unpin is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a !Unpin bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a !Unpin pointer to the stack requires unsafe Pinning a !Unpin pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net.","breadcrumbs":"Practical rules for Pinning","id":"31","title":"Practical rules for Pinning"},"32":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"32","title":"Projection/structural pinning"},"33":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"33","title":"Pin and Drop"},"34":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"34","title":"Putting it all together"},"35":{"body":"But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is // unsafe. A value pinned to heap can be constructed while staying in safe // Rust so we can use that to avoid unsafe. You can also use crates like // `pin_utils` to pin to the stack safely, just remember that they use // unsafe under the hood so it's like using an already-reviewed unsafe // implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work: // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers so nothing bad happens here: // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { Yielded(Y), Complete(R), } trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning.\n// In this case, only we as implementors \"feel\" this, however, if someone is\n// relying on our Pinned pointer this will prevent them from moving it. You need\n// to enable the feature flag `#![feature(optin_builtin_traits)]` and use the\n// nightly compiler to implement `!Unpin`. Normally, you would use\n// `std::marker::PhantomPinned` to indicate that the struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. if let GeneratorA::Yield1 {to_borrow, borrowed} = self { *borrowed = to_borrow; } GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"Bonus section: Fixing our self-referential generator and learning more about Pin","id":"35","title":"Bonus section: Fixing our self-referential generator and learning more about Pin"},"36":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"36","title":"Futures in Rust"},"37":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"37","title":"Implementing our own Futures"},"38":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"38","title":"The Executor"},"39":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"39","title":"The Future implementation"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"40","title":"Why using thread park/unpark is a bad idea for a library"},"41":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"41","title":"The Reactor"},"42":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"42","title":"Async/Await and concurrent Futures"},"43":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"43","title":"Our finished code"},"44":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"44","title":"Conclusion and exercises"},"45":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"45","title":"Reader exercises"},"46":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"46","title":"Avoid thread::park"},"47":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"47","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"48":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"48","title":"Avoid creating a new Waker for every event"},"49":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"49","title":"Could we implement more methods on our executor?"},"5":{"body":"Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread, schedule a new thread to run and jump to that These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"50":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"50","title":"Building a better exectuor"},"51":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"51","title":"Further reading"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Relevant for: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Relevant for: Understanding how the async/await syntax works since it's how await is implemented Knowing why we need Pin Understanding why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"I've written about green threads before. Go check out Green Threads Explained in 200 lines of Rust if you're interested. Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library.","breadcrumbs":"Stackful coroutines/green threads","id":"22","title":"Stackful coroutines/green threads"},"23":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"23","title":"Combinators"},"24":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of any single step require. That means that adding steps to a chain of computations might not require any increased memory at all.","breadcrumbs":"Stackless coroutines/generators","id":"24","title":"Stackless coroutines/generators"},"25":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*|---code before yield---|*/ /*|*/ println!(\"Hello\"); /*|*/ /*|*/ let a = a1 * 2; /*|*/ /*|------------------------|*/ *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*|----code after yield----|*/ /*|*/ println!(\"world!\"); /*|*/ /*|-------------------------|*/ *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Now what does our rewritten state machine look like with this example? # // If you've ever wondered why the parameters are called Y and R the naming from\n# // the original rfc most likely holds the answer\n# enum GeneratorState<Y, R> {\n# // originally called `CoResult`\n# Yielded(Y), // originally called `Yield(Y)`\n# Complete(R), // originally called `Return(R)`\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } // If you uncomment this, very bad things can happen. This is why we need `Pin` // std::mem::swap(&mut gen, &mut gen2); if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // if you uncomment `mem::swap`.. this should now start gen2. if let GeneratorState::Complete(()) = gen.resume() { () };\n} enum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match self { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Try to uncomment the line with mem::swap and see the results. While the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe. // However, as you'll see in the start of the next chapter value pinned to // heap can be constructed while staying in safe Rust so we can use // that to avoid unsafe. You can also use crates like `pin_utils` to do // this safely, just remember that they use unsafe under the hood so it's // like using an already-reviewed unsafe implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers. Nothing inherently bad happens here. // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { // originally called `CoResult` Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning. In this case,\n// only we as implementors \"feel\" this, however, if someone is relying on our Pinned pointer\n// this will prevent them from moving it. You need to enable the feature flag // `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.\n// Normally, you would use `std::marker::PhantomPinned` to indicate that the\n// struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; match this { GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow, _ => unreachable!(), }; GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"How generators work","id":"25","title":"How generators work"},"26":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"26","title":"Bonus section - self referential generators in Rust today"},"27":{"body":"Relevant for Understanding Generators and Futures Knowing how to use Pin is required when implementing your own Future Understanding how to make self-referential types safe to use in Rust Learning how borrowing across await points is accomplished Pin was suggested in RFC#2349 We already got a brief introduction of Pin in the previous chapters, so we'll start off without any further introduction. Let's jump strait to some definitions and then create 10 rules to remember when we work with Pin.","breadcrumbs":"Pin","id":"27","title":"Pin"},"28":{"body":"Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Pin is only relevant for pointers. A reference to an object is a pointer. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful. For the next paragraph we'll rename these markers to: !Unpin = MustStay and Unpin = CanMove It just makes it much easier to talk about them.","breadcrumbs":"Definitions","id":"28","title":"Definitions"},"29":{"body":"If T: CanMove (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: CanMove means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: MustStay. In other words: requiring a pinned pointer to a type which is MustStay prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement CanMove. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are MustStay is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a MustStay bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a MustStay pointer to the stack requires unsafe Pinning a MustStay pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net. Let's take a look at an example: use std::pin::Pin; fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); // try commenting out this line println!(\"a: {}, b: {}\", test2.a(), test2.b()); } #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get: a: test1, b: test1 Next we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. We should expect that printing the fields of test2 should display the same as test1 (since the object we printed before the swap has moved there now). a: test1, b: test2 The pointer to b still points to the old location. That location is now occupied with the string \"test2\". This can be a bit hard to visualize so I made a figure that i hope can help. Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well. If we change the example to using Pin instead: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!( \"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()) ); // Try to uncomment this and see what happens // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!( \"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()) );\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin (aka MustStay). We use some tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead. Stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated. The next example solves some of our friction at the cost of a heap allocation. use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); // Try to uncomment this and see what happens // std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Rules to remember","id":"29","title":"Rules to remember"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"30","title":"Projection/structural pinning"},"31":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"31","title":"Pin and Drop"},"32":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"32","title":"Putting it all together"},"33":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"33","title":"Futures in Rust"},"34":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"34","title":"Implementing our own Futures"},"35":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"35","title":"The Executor"},"36":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"36","title":"The Future implementation"},"37":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"37","title":"Why using thread park/unpark is a bad idea for a library"},"38":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"38","title":"The Reactor"},"39":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"39","title":"Async/Await and concurrent Futures"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"40","title":"Our finished code"},"41":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"41","title":"Conclusion and exercises"},"42":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"42","title":"Reader exercises"},"43":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"43","title":"Avoid thread::park"},"44":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"44","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"45":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"45","title":"Avoid creating a new Waker for every event"},"46":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"46","title":"Could we implement more methods on our executor?"},"47":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"47","title":"Building a better exectuor"},"48":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"48","title":"Further reading"},"5":{"body":"Green threads has been popularized by GO in the recent years. Green threads uses the same basic technique as operating systems does to handle concurrency. Green threads are implemented by setting up a stack for each task you want to execute and make the CPU \"jump\" from one stack to another to switch between tasks. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread and so on These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. The difference is that the callbacks are run on the same thread using this example. The OS threads we create are basically just used as timers.","breadcrumbs":"Callback based approaches","id":"6","title":"Callback based approaches"},"7":{"body":"You might start to wonder by now, when are we going to talk about Futures? Well, we're getting there. You see promises, futures and other names for deferred computations are often used interchangeably. There are formal differences between them but we'll not cover that here but it's worth explaining promises a bit since they're widely known due to beeing used in Javascript and will serve as segway to Rusts Futures. First of all, many languages has a concept of promises but I'll use the ones from Javascript in the examples below. Promises is one way to deal with the complexity which comes with a callback based approach. Instead of: setTimer(200, () => { setTimer(100, () => { setTimer(50, () => { console.log(\"I'm the last one\"); }); });\n}); We can to this: function timer(ms) { return new Promise((resolve) => setTimeout(resolve, ms))\n} timer(200)\n.then(() => return timer(100))\n.then(() => return timer(50))\n.then(() => console.log(\"I'm the last one)); The change is even more substantial under the hood. You see, promises return a state machine which can be in one of three states: pending, fulfilled or rejected. So when we call timer(200) in the sample above, we get back a promise in the state pending. Since promises are re-written as state machines they also enable an even better syntax where we now can write our last example like this: async function run() { await timer(200); await timer(100); await timer(50); console.log(\"I'm the last one\");\n} You can consider the run function a pausable task consisting of several sub-tasks. On each \"await\" point it yields control to the scheduler (in this case it's the well known Javascript event loop). Once one of the sub-tasks changes state to either fulfilled or rejected the task is sheduled to continue to the next step. Syntactically, Rusts Futures 1.0 was a lot like the promises example above and Rusts Futures 3.0 is a lot like async/await in our last example. Now this is also where the similarities with Rusts Futures stop. The reason we go through all this is to get an introduction and get into the right mindset for exploring Rusts Futures. To avoid confusion later on: There is one difference you should know. Javascript promises are eagerly evaluated. That means that once it's created, it starts running a task. Rusts Futures on the other hand is lazily evaluated. They need to be polled once before they do any work. You'll see in a moment. PANIC BUTTON (next chapter)","breadcrumbs":"From callbacks to promises","id":"7","title":"From callbacks to promises"},"8":{"body":"Overview: High level introduction to concurrency in Rust Knowing what Rust provides and not when working with async code Understanding why we need a runtime-library in Rust Getting pointers to further reading on concurrency in general","breadcrumbs":"Futures in Rust","id":"8","title":"Futures in Rust"},"9":{"body":"So what is a future? A future is a representation of some operation which will complete in the future. Async in Rust uses a Poll based approach, in which an asynchronous task will have three phases. The Poll phase. A Future is polled which result in the task progressing until a point where it can no longer make progress. We often refer to the part of the runtime which polls a Future as an executor. The Wait phase. An event source, most often referred to as a reactor, registers that a Future is waiting for an event to happen and makes sure that it will wake the Future when that event is ready. The Wake phase. The event happens and the Future is woken up. It's now up to the executor which polled the Future in step 1 to schedule the future to be polled again and make further progress until it completes or reaches a new point where it can't make further progress and the cycle repeats. Now, when we talk about futures I find it useful to make a distinction between non-leaf futures and leaf futures early on because in practice they're pretty different from one 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The goal is to get a better understanding of \"async\" in Rust by creating a toy runtime consisting of a Reactor and an Executor, and our own futures which we can run concurrently. We'll start off a bit differently than most other explanations. Instead of deferring some of the details about what Futures are and how they're implemented, we tackle that head on first. I learn best when I can take basic understandable concepts and build piece by piece of these basic building blocks until everything is understood. This way, most questions will be answered and explored up front and the conclusions later on seems natural. I've limited myself to a 200 line main example so that we need keep this fairly brief. In the end I've made some reader exercises you can do if you want to fix some of the most glaring omissions and shortcuts we took and create a slightly better example yourself. This book is developed in the open, and contributions are welcome. You'll find the repository for the book itself here . The final example which you can clone, fork or copy can be found here","breadcrumbs":"Futures Explained in 200 Lines of Rust","id":"0","title":"Futures Explained in 200 Lines of Rust"},"1":{"body":"There are many good resources and examples already. First of all, this book will focus on Futures and async/await specifically and not in the context of any specific runtime. Secondly, I've always found small runnable examples very exiting to learn from. Thanks to Mdbook the examples can even be edited and explored further by uncommenting certain lines or adding new ones yourself. I use that quite a but throughout so keep an eye out when reading through editable code segments. It's all code that you can download, play with and learn from. We'll and end up with an understandable example including a Future implementation, an Executor and a Reactor in less than 200 lines of code. We don't rely on any dependencies or real I/O which means it's very easy to explore further and try your own ideas.","breadcrumbs":"What does this book give you that isn't covered elsewhere?","id":"1","title":"What does this book give you that isn't covered elsewhere?"},"10":{"body":"Runtimes create leaf futures which represents a resource like a socket. // stream is a **leaf-future**\nlet mut stream = tokio::net::TcpStream::connect(\"127.0.0.1:3000\"); Operations on these resources, like a Read on a socket, will be non-blocking and return a future which we call a leaf future since it's the future which we're actually waiting on. It's unlikely that you'll implement a leaf future yourself unless you're writing a runtime, but we'll go through how they're constructed in this book as well. It's also unlikely that you'll pass a leaf-future to a runtime and run it to completion alone as you'll understand by reading the next paragraph.","breadcrumbs":"Leaf futures","id":"10","title":"Leaf futures"},"11":{"body":"Non-leaf-futures is the kind of futures we as users of a runtime writes ourselves using the async keyword to create a task which can be run on the executor. The bulk of an async program will consist of non-leaf-futures, which are a kind of pause-able computation. This is an important distinction since these futures represents a set of operations . Often, such a task will await a leaf future as one of many operations to complete the task. // Non-leaf-future\nlet non_leaf = async { let mut stream = TcpStream::connect(\"127.0.0.1:3000\").await.unwrap();// <- yield println!(\"connected!\"); let result = stream.write(b\"hello world\\n\").await; // <- yield println!(\"message sent!\"); ...\n}; The key to these tasks is that they're able to yield control to the runtime's scheduler and then resume execution again where it left off at a later point. In contrast to leaf futures, these kind of futures does not themselves represent an I/O resource. When we poll these futures we either run some code or we yield to the scheduler while waiting for some resource to signal us that it's ready so we can resume where we left off.","breadcrumbs":"Non-leaf-futures","id":"11","title":"Non-leaf-futures"},"12":{"body":"Languages like C#, JavaScript, Java, GO and many others comes with a runtime for handling concurrency. So if you come from one of those languages this will seem a bit strange to you. Rust is different from these languages in the sense that Rust doesn't come with a runtime for handling concurrency, so you need to use a library which provide this for you. Quite a bit of complexity attributed to Futures are actually complexity rooted in runtimes. Creating an efficient runtime is hard. Learning how to use one correctly requires quite a bit of effort as well, but you'll see that there are several similarities between these kind of runtimes so learning one makes learning the next much easier. The difference between Rust and other languages is that you have to make an active choice when it comes to picking a runtime. Most often, in other languages you'll just use the one provided for you. An async runtime can be divided into two parts: The Executor The Reactor When Rusts Futures were designed there was a desire to separate the job of notifying a Future that it can do more work, and actually doing the work on the Future. You can think of the former as the reactor's job, and the latter as the executors job. These two parts of a runtime interacts using the Waker type. The two most popular runtimes for Futures as of writing this is: async-std Tokio","breadcrumbs":"Runtimes","id":"12","title":"Runtimes"},"13":{"body":"A common interface representing an operation which will be completed in the future through the Future trait. An ergonomic way of creating tasks which can be suspended and resumed through the async and await keywords. A defined interface wake up a suspended task through the Waker type. That's really what Rusts standard library does. As you see there is no definition of non-blocking I/O, how these tasks are created or how they're run.","breadcrumbs":"What Rust's standard library takes care of","id":"13","title":"What Rust's standard library takes care of"},"14":{"body":"If you find the concepts of concurrency and async programming confusing in general, I know where you're coming from and I have written some resources to try to give a high level overview that will make it easier to learn Rusts Futures afterwards: Async Basics - The difference between concurrency and parallelism Async Basics - Async history Async Basics - Strategies for handling I/O Async Basics - Epoll, Kqueue and IOCP Learning these concepts by studying futures is making it much harder than it needs to be, so go on and read these chapters if you feel a bit unsure. I'll be right here when you're back. However, if you feel that you have the basics covered, then let's get moving!","breadcrumbs":"Bonus section","id":"14","title":"Bonus section"},"15":{"body":"Overview: Understanding how the Waker object is constructed Learning how the runtime know when a leaf-future can resume Learning the basics of dynamic dispatch and trait objects The Waker type is described as part of RFC#2592 .","breadcrumbs":"Waker and Context","id":"15","title":"Waker and Context"},"16":{"body":"The Waker type allows for a loose coupling between the reactor-part and the executor-part of a runtime. By having a wake up mechanism that is not tied to the thing that executes the future, runtime-implementors can come up with interesting new wake-up mechanisms. An example of this can be spawning a thread to do some work that eventually notifies the future, completely independent of the current runtime. Without a waker, the executor would be the only way to notify a running task, whereas with the waker, we get a loose coupling where it's easy to extend the ecosystem with new leaf-level tasks. If you want to read more about the reasoning behind the Waker type I can recommend Withoutboats articles series about them .","breadcrumbs":"The Waker","id":"16","title":"The Waker"},"17":{"body":"As the docs state as of now this type only wrapps a Waker, but it gives some flexibility for future evolutions of the API in Rust. The context can hold task-local storage and provide space for debugging hooks in later iterations.","breadcrumbs":"The Context type","id":"17","title":"The Context type"},"18":{"body":"One of the most confusing things we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows us to use dynamic dispatch to call methods on a type erased trait object we construct our selves. If you want to know more about dynamic dispatch in Rust I can recommend an article written by Adam Schwalm called Exploring Dynamic Dispatch in Rust . Let's explain this a bit more in detail.","breadcrumbs":"Understanding the Waker","id":"18","title":"Understanding the Waker"},"19":{"body":"To get a better understanding of how we implement the Waker in Rust, we need to take a step back and talk about some fundamentals. Let's start by taking a look at the size of some different pointer types in Rust. Run the following code (You'll have to press \"play\" to see the output) : # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"======== The size of different pointers in Rust: ========\"); println!(\"&dyn Trait:-----{}\", size_of::<&dyn SomeTrait>()); println!(\"&[&dyn Trait]:--{}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Box<Trait>:-----{}\", size_of::<Box<SomeTrait>>()); println!(\"&i32:-----------{}\", size_of::<&i32>()); println!(\"&[i32]:---------{}\", size_of::<&[i32]>()); println!(\"Box<i32>:-------{}\", size_of::<Box<i32>>()); println!(\"&Box<i32>:------{}\", size_of::<&Box<i32>>()); println!(\"[&dyn Trait;4]:-{}\", size_of::<[&dyn SomeTrait; 4]>()); println!(\"[i32;4]:--------{}\", size_of::<[i32; 4]>());\n} As you see from the output after running this, the sizes of the references varies. Many are 8 bytes (which is a pointer size on 64 bit systems), but some are 16 bytes. The 16 byte sized pointers are called \"fat pointers\" since they carry extra information. Example &[i32] : The first 8 bytes is the actual pointer to the first element in the array (or part of an array the slice refers to) The second 8 bytes is the length of the slice. Example &dyn SomeTrait: This is the type of fat pointer we'll concern ourselves about going forward. &dyn SomeTrait is a reference to a trait, or what Rust calls a trait object . The layout for a pointer to a trait object looks like this: The first 8 bytes points to the data for the trait object The second 8 bytes points to the vtable for the trait object The reason for this is to allow us to refer to an object we know nothing about except that it implements the methods defined by our trait. To accomplish this we use dynamic dispatch . Let's explain this in code instead of words by implementing our own trait object from these parts: This is an example of editable code. You can change everything in the example and try to run it. If you want to go back, press the undo symbol. Keep an eye out for these as we go forward. Many examples will be editable. // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)\ntrait Test { fn add(&self) -> i32; fn sub(&self) -> i32; fn mul(&self) -> i32;\n} // This will represent our home brewn fat pointer to a trait object\n#[repr(C)]\nstruct FatPointer<'a> { /// A reference is a pointer to an instantiated `Data` instance data: &'a mut Data, /// Since we need to pass in literal values like length and alignment it's /// easiest for us to convert pointers to usize-integers instead of the other way around. vtable: *const usize,\n} // This is the data in our trait object. It's just two numbers we want to operate on.\nstruct Data { a: i32, b: i32,\n} // ====== function definitions ======\nfn add(s: &Data) -> i32 { s.a + s.b\n}\nfn sub(s: &Data) -> i32 { s.a - s.b\n}\nfn mul(s: &Data) -> i32 { s.a * s.b\n} fn main() { let mut data = Data {a: 3, b: 2}; // vtable is like special purpose array of pointer-length types with a fixed // format where the three first values has a special meaning like the // length of the array is encoded in the array itself as the second value. let vtable = vec![ 0, // pointer to `Drop` (which we're not implementing here) 6, // lenght of vtable 8, // alignment // we need to make sure we add these in the same order as defined in the Trait. add as usize, // function pointer - try changing the order of `add` sub as usize, // function pointer - and `sub` to see what happens mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::<FatPointer, &dyn Test>(fat_pointer) }; // And voalá, it's now a trait object we can call methods on println!(\"Add: 3 + 2 = {}\", test.add()); println!(\"Sub: 3 - 2 = {}\", test.sub()); println!(\"Mul: 3 * 2 = {}\", test.mul());\n} Now that you know this you also know why how we implement the Waker type in Rust. Later on, when we implement our own Waker we'll actually set up a vtable like we do here to and knowing why we do that and how it works will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"19","title":"Fat pointers in Rust"},"2":{"body":"I'll like to take the chance of thanking the people behind mio, tokio, async_std, Futures, libc, crossbeam and many other libraries which so much is built upon. Even the RFCs that much of the design is built upon is very well written and very helpful. So thanks!","breadcrumbs":"Credits and thanks","id":"2","title":"Credits and thanks"},"20":{"body":"You might wonder why the Waker was implemented like this and not just as a normal trait? The reason is flexibility. Implementing the Waker the way we do here gives a lot of flexibility of choosing what memory management scheme to use. The \"normal\" way is by using an Arc to use reference count keep track of when a Waker object can be dropped. However, this is not the only way, you could also use purely global functions and state, or any other way you wish. This leaves a lot of options on the table for runtime implementors.","breadcrumbs":"Bonus section","id":"20","title":"Bonus section"},"21":{"body":"Overview: Understandi how the async/await syntax works since it's how await is implemented Know why we need Pin Understand why Rusts async model is very efficient The motivation for Generators can be found in RFC#2033 . It's very well written and I can recommend reading through it (it talks as much about async/await as it does about generators). The second difficult part is understanding Generators and the Pin type. Since they're related we'll start off by exploring generators first. By doing that we'll soon get to see why we need to be able to \"pin\" some data to a fixed location in memory and get an introduction to Pin as well. Basically, there were three main options discussed when designing how Rust would handle concurrency: Stackful coroutines, better known as green threads. Using combinators. Stackless coroutines, better known as generators. We covered green threads in the background information so we won't repeat that here. We'll concentrate on the variants of stackless coroutines which Rust uses today.","breadcrumbs":"Generators","id":"21","title":"Generators"},"22":{"body":"Futures 1.0 used combinators. If you've worked with Promises in JavaScript, you already know combinators. In Rust they look like this: let future = Connection::connect(conn_str).and_then(|conn| { conn.query(\"somerequest\").map(|row|{ SomeStruct::from(row) }).collect::<Vec<SomeStruct>>()\n}); let rows: Result<Vec<SomeStruct>, SomeLibraryError> = block_on(future).unwrap(); While an effective solution there are mainly three downsides I'll focus on: The error messages produced could be extremely long and arcane Not optimal memory usage Did not allow to borrow across combinator steps. Point #3, is actually a major drawback with Futures 1.0. Not allowing borrows across suspension points ends up being very un-ergonomic and to accomplish some tasks it requires extra allocations or copying which is inefficient. The reason for the higher than optimal memory usage is that this is basically a callback-based approach, where each closure stores all the data it needs for computation. This means that as we chain these, the memory required to store the needed state increases with each added step.","breadcrumbs":"Combinators","id":"22","title":"Combinators"},"23":{"body":"This is the model used in Rust today. It has a few notable advantages: It's easy to convert normal Rust code to a stackless coroutine using using async/await as keywords (it can even be done using a macro). No need for context switching and saving/restoring CPU state No need to handle dynamic stack allocation Very memory efficient Allows us to borrow across suspension points The last point is in contrast to Futures 1.0. With async/await we can do this: async fn myfn() { let text = String::from(\"Hello world\"); let borrowed = &text[0..5]; somefuture.await; println!(\"{}\", borrowed);\n} Async in Rust is implemented using Generators. So to understand how Async really works we need to understand generators first. Generators in Rust are implemented as state machines. The memory footprint of a chain of computations is only defined by the largest footprint of what the largest step require. That means that adding steps to a chain of computations might not require any increased memory at all and it's one of the reasons why Futures and Async in Rust has very little overhead.","breadcrumbs":"Stackless coroutines/generators","id":"23","title":"Stackless coroutines/generators"},"24":{"body":"In Nightly Rust today you can use the yield keyword. Basically using this keyword in a closure, converts it to a generator. A closure could look like this before we had a concept of Pin: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; fn main() { let a: i32 = 4; let mut gen = move || { println!(\"Hello\"); yield a * 2; println!(\"world!\"); }; if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} Early on, before there was a consensus about the design of Pin, this compiled to something looking similar to this: fn main() { let mut gen = GeneratorA::start(4); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n} // If you've ever wondered why the parameters are called Y and R the naming from\n// the original rfc most likely holds the answer\nenum GeneratorState<Y, R> { Yielded(Y), // originally called `Yield(Y)` Complete(R), // originally called `Return(R)`\n} trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter(i32), Yield1(i32), Exit,\n} impl GeneratorA { fn start(a1: i32) -> Self { GeneratorA::Enter(a1) }\n} impl Generator for GeneratorA { type Yield = i32; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter(a1) => { /*----code before yield----*/ println!(\"Hello\"); let a = a1 * 2; *self = GeneratorA::Yield1(a); GeneratorState::Yielded(a) } GeneratorA::Yield1(_) => { /*-----code after yield-----*/ println!(\"world!\"); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} The yield keyword was discussed first in RFC#1823 and in RFC#1832 . Now that you know that the yield keyword in reality rewrites your code to become a state machine, you'll also know the basics of how await works. It's very similar. Now, there are some limitations in our naive state machine above. What happens when you have a borrow across a yield point? We could forbid that, but one of the major design goals for the async/await syntax has been to allow this . These kinds of borrows were not possible using Futures 1.0 so we can't let this limitation just slip and call it a day yet. Instead of discussing it in theory, let's look at some code. We'll use the optimized version of the state machines which is used in Rust today. For a more in depth explanation see Tyler Mandry's excellent article: How Rust optimizes async/await let mut generator = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; We'll be hand-coding some versions of a state-machines representing a state machine for the generator defined aboce. We step through each step \"manually\" in every example, so it looks pretty unfamiliar. We could add some syntactic sugar like implementing the Iterator trait for our generators which would let us do this: for val in generator { println!(\"{}\", val);\n} It's a pretty trivial change to make, but this chapter is already getting long. Just keep this in the back of your head as we move forward. Now what does our rewritten state machine look like with this example? # enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R),\n# }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# } enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: &String, // uh, what lifetime should this have? }, Exit,\n} # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state match std::mem::replace(&mut *self, GeneratorA::Exit) { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; // <--- NB! let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed}; GeneratorState::Yielded(res) } GeneratorA::Yield1 {to_borrow, borrowed} => { println!(\"Hello {}\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} If you try to compile this you'll get an error (just try it yourself by pressing play). What is the lifetime of &String. It's not the same as the lifetime of Self. It's not static. Turns out that it's not possible for us in Rusts syntax to describe this lifetime, which means, that to make this work, we'll have to let the compiler know that we control this correctly ourselves. That means turning to unsafe. Let's try to write an implementation that will compiler using unsafe. As you'll see we end up in a self referential struct . A struct which holds references into itself. As you'll notice, this compiles just fine! enum GeneratorState<Y, R> { Yielded(Y), Complete(R), } trait Generator { type Yield; type Return; fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n}\nimpl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> { match self { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; // We set the self-reference here if let GeneratorA::Yield1 {to_borrow, borrowed} = self { *borrowed = to_borrow; } GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *self = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Remember that our example is the generator we crated which looked like this: let mut gen = move || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; Below is an example of how we could run this state-machine. But there is still one huge problem with this: pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } if let GeneratorState::Complete(()) = gen.resume() { () };\n}\n# enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R), # }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# }\n# # enum GeneratorA {\n# Enter,\n# Yield1 {\n# to_borrow: String,\n# borrowed: *const String,\n# },\n# Exit,\n# }\n# # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# }\n# impl Generator for GeneratorA {\n# type Yield = usize;\n# type Return = ();\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {\n# match self {\n# GeneratorA::Enter => {\n# let to_borrow = String::from(\"Hello\");\n# let borrowed = &to_borrow;\n# let res = borrowed.len();\n# *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};\n# # // We set the self-reference here\n# if let GeneratorA::Yield1 {to_borrow, borrowed} = self {\n# *borrowed = to_borrow;\n# }\n# # GeneratorState::Yielded(res)\n# }\n# # GeneratorA::Yield1 {borrowed, ..} => {\n# let borrowed: &String = unsafe {&**borrowed};\n# println!(\"{} world\", borrowed);\n# *self = GeneratorA::Exit;\n# GeneratorState::Complete(())\n# }\n# GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"),\n# }\n# }\n# } The problem however is that in safe Rust we can still do this: Run the code and compare the results. Do you see the problem? pub fn main() { let mut gen = GeneratorA::start(); let mut gen2 = GeneratorA::start(); if let GeneratorState::Yielded(n) = gen.resume() { println!(\"Got value {}\", n); } std::mem::swap(&mut gen, &mut gen2); // <--- Big problem! if let GeneratorState::Yielded(n) = gen2.resume() { println!(\"Got value {}\", n); } // This would now start gen2 since we swapped them. if let GeneratorState::Complete(()) = gen.resume() { () };\n}\n# enum GeneratorState<Y, R> {\n# Yielded(Y), # Complete(R), # }\n# # trait Generator {\n# type Yield;\n# type Return;\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;\n# }\n# # enum GeneratorA {\n# Enter,\n# Yield1 {\n# to_borrow: String,\n# borrowed: *const String,\n# },\n# Exit,\n# }\n# # impl GeneratorA {\n# fn start() -> Self {\n# GeneratorA::Enter\n# }\n# }\n# impl Generator for GeneratorA {\n# type Yield = usize;\n# type Return = ();\n# fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {\n# match self {\n# GeneratorA::Enter => {\n# let to_borrow = String::from(\"Hello\");\n# let borrowed = &to_borrow;\n# let res = borrowed.len();\n# *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};\n# # // We set the self-reference here\n# if let GeneratorA::Yield1 {to_borrow, borrowed} = self {\n# *borrowed = to_borrow;\n# }\n# # GeneratorState::Yielded(res)\n# }\n# # GeneratorA::Yield1 {borrowed, ..} => {\n# let borrowed: &String = unsafe {&**borrowed};\n# println!(\"{} world\", borrowed);\n# *self = GeneratorA::Exit;\n# GeneratorState::Complete(())\n# }\n# GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"),\n# }\n# }\n# } Wait? What happened to \"Hello\"? Turns out that while the example above compiles just fine, we expose consumers of this this API to both possible undefined behavior and other memory errors while using just safe Rust. This is a big problem! We'll explain exactly what happened using a slightly simpler example in the next chapter and we'll fix our generator using Pin so join me as we explore the last topic before we implement our main Futures example.","breadcrumbs":"How generators work","id":"24","title":"How generators work"},"25":{"body":"Thanks to PR#45337 you can actually run code like the one in our example in Rust today using the static keyword on nightly. Try it for yourself: #![feature(generators, generator_trait)]\nuse std::ops::{Generator, GeneratorState}; pub fn main() { let gen1 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let gen2 = static || { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; yield borrowed.len(); println!(\"{} world!\", borrowed); }; let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); if let GeneratorState::Yielded(n) = pinned1.as_mut().resume(()) { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume(()) { println!(\"Gen2 got value {}\", n); }; let _ = pinned1.as_mut().resume(()); let _ = pinned2.as_mut().resume(());\n}","breadcrumbs":"Bonus section - self referential generators in Rust today","id":"25","title":"Bonus section - self referential generators in Rust today"},"26":{"body":"Overview Learn how to use Pin and why it's required when implementing your own Future Understand how to make self-referential types safe to use in Rust Learn how borrowing across await points is accomplished Get a set of practical rules to help you work with Pin Pin was suggested in RFC#2349 Let's jump strait to it. Pinning is one of those subjects which is hard to wrap your head around in the start, but once you unlock a mental model for it it gets significantly easier to reason about.","breadcrumbs":"Pin","id":"26","title":"Pin"},"27":{"body":"Pin is only relevant for pointers. A reference to an object is a pointer. Pin consists of the Pin type and the Unpin marker. Pin's purpose in life is to govern the rules that need to apply for types which implement !Unpin. Yep, you're right, that's double negation right there. !Unpin means \"not-un-pin\". This naming scheme is one of Rusts safety features where it deliberately tests if you're too tired to safely implement a type with this marker. If you're starting to get confused, or even angry, by !Unpin it's a good sign that it's time to lay down the work and start over tomorrow with a fresh mind. On a more serious note, I feel obliged to mention that there are valid reasons for the names that were chosen. Naming is not easy, and I considered renaming Unpin and !Unpin in this book to make them easier to reason about. However, an experienced member of the Rust community convinced me that that there is just too many nuances and edge-cases to consider which is easily overlooked when naively giving these markers different names, and I'm convinced that we'll just have to get used to them and use them as is. If you want to you can read a bit of the discussion from the internals thread . One of the best takeaways from there in my eyes is this quote from tmandry: Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful.","breadcrumbs":"Definitions","id":"27","title":"Definitions"},"28":{"body":"Let's start where we left off in the last chapter by making the problem we saw using a self-referential struct in our generator a lot simpler by making some self-referential structs that are easier to reason about than our state machines: For now our example will look like this: use std::pin::Pin; #[derive(Debug)]\nstruct Test { a: String, b: *const String,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), } } fn init(&mut self) { let self_ref: *const String = &self.a; self.b = self_ref; } fn a(&self) -> &str { &self.a } fn b(&self) -> &String { unsafe {&*(self.b)} }\n} Let's walk through this example since we'll be using it the rest of this chapter. We have a self-referential struct Test. Test needs an init method to be created which is strange but we'll need that to keep this example as short as possible. Test provides two methods to get a reference to the value of the fields a and b. Since b is a reference to a we store it as a pointer since the borrowing rules of Rust doesn't allow us to define this lifetime. Now, let's use this example to explain the problem we encounter in detail. As you see, this works as expected: fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # // We need an `init` method to actually set our self-reference\n# fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } In our main method we first instantiate two instances of Test and print out the value of the fields on test1. We get what we'd expect: a: test1, b: test1\na: test2, b: test2 Let's see what happens if we swap the data stored at the memory location which test1 is pointing to with the data stored at the memory location test2 is pointing to and vice a versa. fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } Naively, we could think that what we should get a debug print of test1 two times like this a: test1, b: test1\na: test1, b: test1 But instead we get: a: test1, b: test1\na: test1, b: test2 The pointer to test2.b still points to the old location which is inside test1 now. The struct is not self-referential anymore, it holds a pointer to a field in a different object. That means we can't rely on the lifetime of test2.b to be tied to the lifetime of test2 anymore. If your still not convinced, this should at least convince you: fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test2 = Test::new(\"test2\"); test2.init(); println!(\"a: {}, b: {}\", test1.a(), test1.b()); std::mem::swap(&mut test1, &mut test2); test1.a = \"I've totally changed now!\".to_string(); println!(\"a: {}, b: {}\", test2.a(), test2.b()); }\n# use std::pin::Pin;\n# #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# }\n# # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# }\n# }\n# # fn init(&mut self) {\n# let self_ref: *const String = &self.a;\n# self.b = self_ref;\n# }\n# # fn a(&self) -> &str {\n# &self.a\n# } # # fn b(&self) -> &String {\n# unsafe {&*(self.b)}\n# }\n# } That shouldn't happen. There is no serious error yet, but as you can imagine it's easy to create serious bugs using this code. I created a diagram to help visualize what's going on: Fig 1: Before and after swap swap_problem As you can see this results in unwanted behavior. It's easy to get this to segfault, show UB and fail in other spectacular ways as well.","breadcrumbs":"Pinning and self-referential structs","id":"28","title":"Pinning and self-referential structs"},"29":{"body":"Now, we can solve this problem by using Pin instead. Let's take a look at what our example would look like then: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Self { let a = String::from(txt); Test { a, b: std::ptr::null(), // This makes our type `!Unpin` _marker: PhantomPinned, } } fn init(&mut self) { let self_ptr: *const String = &self.a; self.b = self_ptr; } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} Now, what we've done here is pinning a stack address. That will always be unsafe if our type implements !Unpin. We use the same tricks here, including requiring an init. If we want to fix that and let users avoid unsafe we need to pin our data on the heap instead which we'll show in a second. Let's see what happens if we run our example now: pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!(\"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref())); println!(\"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));\n}\n# use std::pin::Pin;\n# use std::marker::PhantomPinned;\n# # #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# _marker: PhantomPinned,\n# }\n# # # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# // This makes our type `!Unpin`\n# _marker: PhantomPinned,\n# }\n# }\n# fn init(&mut self) {\n# let self_ptr: *const String = &self.a;\n# self.b = self_ptr;\n# }\n# # fn a<'a>(self: Pin<&'a Self>) -> &'a str {\n# &self.get_ref().a\n# }\n# # fn b<'a>(self: Pin<&'a Self>) -> &'a String {\n# unsafe { &*(self.b) }\n# }\n# } Now, if we try to pull the same trick which got us in to trouble the last time you'll get a compilation error. So t pub fn main() { let mut test1 = Test::new(\"test1\"); test1.init(); let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; let mut test2 = Test::new(\"test2\"); test2.init(); let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) }; println!(\"a: {}, b: {}\", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref())); std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut()); println!(\"a: {}, b: {}\", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));\n}\n# use std::pin::Pin;\n# use std::marker::PhantomPinned;\n# # #[derive(Debug)]\n# struct Test {\n# a: String,\n# b: *const String,\n# _marker: PhantomPinned,\n# }\n# # # impl Test {\n# fn new(txt: &str) -> Self {\n# let a = String::from(txt);\n# Test {\n# a,\n# b: std::ptr::null(),\n# // This makes our type `!Unpin`\n# _marker: PhantomPinned,\n# }\n# }\n# fn init(&mut self) {\n# let self_ptr: *const String = &self.a;\n# self.b = self_ptr;\n# }\n# # fn a<'a>(self: Pin<&'a Self>) -> &'a str {\n# &self.get_ref().a\n# }\n# # fn b<'a>(self: Pin<&'a Self>) -> &'a String {\n# unsafe { &*(self.b) }\n# }\n# } It's important to note that stack pinning will always depend on the current stack frame we're in, so we can't create a self referential object in one stack frame and return it since any pointers we take to \"self\" is invalidated.","breadcrumbs":"Pinning to the stack","id":"29","title":"Pinning to the stack"},"3":{"body":"Before we go into the details about Futures in Rust, let's take a quick look at the alternatives for handling concurrent programming in general and some pros and cons for each of them. While we do that we'll get some information on concurrency which will make it easier for us when we dive in to Futures specifically. For fun, I've added a small snipped of runnable code with most of the examples. If you're like me, things get way more interesting then and maybe you'll se some things you haven't seen before along the way.","breadcrumbs":"Some Background Information","id":"3","title":"Some Background Information"},"30":{"body":"For completeness let's remove some unsafe and the need for an init method at the cost of a heap allocation. Pinning to the heap is safe so the user doesn't need to implement any unsafe code: use std::pin::Pin;\nuse std::marker::PhantomPinned; #[derive(Debug)]\nstruct Test { a: String, b: *const String, _marker: PhantomPinned,\n} impl Test { fn new(txt: &str) -> Pin<Box<Self>> { let a = String::from(txt); let t = Test { a, b: std::ptr::null(), _marker: PhantomPinned, }; let mut boxed = Box::pin(t); let self_ptr: *const String = &boxed.as_ref().a; unsafe { boxed.as_mut().get_unchecked_mut().b = self_ptr }; boxed } fn a<'a>(self: Pin<&'a Self>) -> &'a str { &self.get_ref().a } fn b<'a>(self: Pin<&'a Self>) -> &'a String { unsafe { &*(self.b) } }\n} pub fn main() { let mut test1 = Test::new(\"test1\"); let mut test2 = Test::new(\"test2\"); println!(\"a: {}, b: {}\",test1.as_ref().a(), test1.as_ref().b()); println!(\"a: {}, b: {}\",test2.as_ref().a(), test2.as_ref().b());\n} The fact that boxing (heap allocating) a value that implements !Unpin is safe makes sense. Once the data is allocated on the heap it will have a stable address. There is no need for us as users of the API to take special care and ensure that the self-referential pointer stays valid. There are ways to safely give some guarantees on stack pinning as well, but right now you need to use a crate like pin_project to do that.","breadcrumbs":"Pinning to the heap","id":"30","title":"Pinning to the heap"},"31":{"body":"If T: Unpin (which is the default), then Pin<'a, T> is entirely equivalent to &'a mut T. in other words: Unpin means it's OK for this type to be moved even when pinned, so Pin will have no effect on such a type. Getting a &mut T to a pinned pointer requires unsafe if T: !Unpin. In other words: requiring a pinned pointer to a type which is !Unpin prevents the user of that API from moving that value unless it choses to write unsafe code. Pinning does nothing special with memory allocation like putting it into some \"read only\" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden. Most standard library types implement Unpin. The same goes for most \"normal\" types you encounter in Rust. Futures and Generators are two exceptions. The main use case for Pin is to allow self referential types, the whole justification for stabilizing them was to allow that. There are still corner cases in the API which are being explored. The implementation behind objects that are !Unpin is most likely unsafe. Moving such a type can cause the universe to crash. As of the time of writing this book, creating and reading fields of a self referential struct still requires unsafe. You can add a !Unpin bound on a type on nightly with a feature flag, or by adding std::marker::PhantomPinned to your type on stable. You can either pin a value to memory on the stack or on the heap. Pinning a !Unpin pointer to the stack requires unsafe Pinning a !Unpin pointer to the heap does not require unsafe. There is a shortcut for doing this using Box::pin. Unsafe code does not mean it's literally \"unsafe\", it only relieves the guarantees you normally get from the compiler. An unsafe implementation can be perfectly safe to do, but you have no safety net.","breadcrumbs":"Practical rules for Pinning","id":"31","title":"Practical rules for Pinning"},"32":{"body":"In short, projection is a programming language term. mystruct.field1 is a projection. Structural pinning is using Pin on fields. This has several caveats and is not something you'll normally see so I refer to the documentation for that.","breadcrumbs":"Projection/structural pinning","id":"32","title":"Projection/structural pinning"},"33":{"body":"The Pin guarantee exists from the moment the value is pinned until it's dropped. In the Drop implementation you take a mutable reference to self, which means extra care must be taken when implementing Drop for pinned types.","breadcrumbs":"Pin and Drop","id":"33","title":"Pin and Drop"},"34":{"body":"This is exactly what we'll do when we implement our own Futures stay tuned, we're soon finished.","breadcrumbs":"Putting it all together","id":"34","title":"Putting it all together"},"35":{"body":"But now, let's prevent this problem using Pin. We'll discuss Pin more in the next chapter, but you'll get an introduction here by just reading the comments. #![feature(optin_builtin_traits)] // needed to implement `!Unpin`\nuse std::pin::Pin; pub fn main() { let gen1 = GeneratorA::start(); let gen2 = GeneratorA::start(); // Before we pin the pointers, this is safe to do // std::mem::swap(&mut gen, &mut gen2); // constructing a `Pin::new()` on a type which does not implement `Unpin` is // unsafe. A value pinned to heap can be constructed while staying in safe // Rust so we can use that to avoid unsafe. You can also use crates like // `pin_utils` to pin to the stack safely, just remember that they use // unsafe under the hood so it's like using an already-reviewed unsafe // implementation. let mut pinned1 = Box::pin(gen1); let mut pinned2 = Box::pin(gen2); // Uncomment these if you think it's safe to pin the values to the stack instead // (it is in this case). Remember to comment out the two previous lines first. //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) }; //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) }; if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() { println!(\"Gen1 got value {}\", n); } if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() { println!(\"Gen2 got value {}\", n); }; // This won't work: // std::mem::swap(&mut gen, &mut gen2); // This will work but will just swap the pointers so nothing bad happens here: // std::mem::swap(&mut pinned1, &mut pinned2); let _ = pinned1.as_mut().resume(); let _ = pinned2.as_mut().resume();\n} enum GeneratorState<Y, R> { Yielded(Y), Complete(R), } trait Generator { type Yield; type Return; fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;\n} enum GeneratorA { Enter, Yield1 { to_borrow: String, borrowed: *const String, }, Exit,\n} impl GeneratorA { fn start() -> Self { GeneratorA::Enter }\n} // This tells us that the underlying pointer is not safe to move after pinning.\n// In this case, only we as implementors \"feel\" this, however, if someone is\n// relying on our Pinned pointer this will prevent them from moving it. You need\n// to enable the feature flag `#![feature(optin_builtin_traits)]` and use the\n// nightly compiler to implement `!Unpin`. Normally, you would use\n// `std::marker::PhantomPinned` to indicate that the struct is `!Unpin`.\nimpl !Unpin for GeneratorA { } impl Generator for GeneratorA { type Yield = usize; type Return = (); fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> { // lets us get ownership over current state let this = unsafe { self.get_unchecked_mut() }; match this { GeneratorA::Enter => { let to_borrow = String::from(\"Hello\"); let borrowed = &to_borrow; let res = borrowed.len(); *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()}; // Trick to actually get a self reference. We can't reference // the `String` earlier since these references will point to the // location in this stack frame which will not be valid anymore // when this function returns. if let GeneratorA::Yield1 {to_borrow, borrowed} = self { *borrowed = to_borrow; } GeneratorState::Yielded(res) } GeneratorA::Yield1 {borrowed, ..} => { let borrowed: &String = unsafe {&**borrowed}; println!(\"{} world\", borrowed); *this = GeneratorA::Exit; GeneratorState::Complete(()) } GeneratorA::Exit => panic!(\"Can't advance an exited generator!\"), } }\n} Now, as you see, the consumer of this API must either: Box the value and thereby allocating it on the heap Use unsafe and pin the value to the stack. The user knows that if they move the value afterwards it will violate the guarantee they promise to uphold when they did their unsafe implementation. Hopefully, after this you'll have an idea of what happens when you use the yield or await keywords inside an async function, and why we need Pin if we want to be able to safely borrow across yield/await points.","breadcrumbs":"Bonus section: Fixing our self-referential generator and learning more about Pin","id":"35","title":"Bonus section: Fixing our self-referential generator and learning more about Pin"},"36":{"body":"We'll create our own Futures together with a fake reactor and a simple executor which allows you to edit, run an play around with the code right here in your browser. I'll walk you through the example, but if you want to check it out closer, you can always clone the repository and play around with the code yourself. There are several branches explained in the readme, but two are relevant for this chapter. The main branch is the example we go through here, and the basic_example_commented branch is this example with extensive comments. If you want to follow along as we go through, initialize a new cargo project by creating a new folder and run cargo init inside it. Everything we write here will be in main.rs","breadcrumbs":"Futures in Rust","id":"36","title":"Futures in Rust"},"37":{"body":"Let's start off by getting all our imports right away so you can follow along use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n};","breadcrumbs":"Implementing our own Futures","id":"37","title":"Implementing our own Futures"},"38":{"body":"The executors responsibility is to take one or more futures and run them to completion. The first thing an executor does when it gets a Future is polling it. When polled one of three things can happen: The future returns Ready and we schedule whatever chained operations to run The future hasn't been polled before so we pass it a Waker and suspend it The futures has been polled before but is not ready and returns Pending Rust provides a way for the Reactor and Executor to communicate through the Waker. The reactor stores this Waker and calls Waker::wake() on it once a Future has resolved and should be polled again. Our Executor will look like this: // Our executor takes any object which implements the `Future` trait\nfn block_on<F: Future>(mut future: F) -> F::Output { // the first thing we do is to construct a `Waker` which we'll pass on to // the `reactor` so it can wake us up when an event is ready. let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); // The context struct is just a wrapper for a `Waker` object. Maybe in the // future this will do more, but right now it's just a wrapper. let mut cx = Context::from_waker(&waker); // We poll in a loop, but it's not a busy loop. It will only run when // an event occurs, or a thread has a \"spurious wakeup\" (an unexpected wakeup // that can happen for no good reason). let val = loop { // So, since we run this on one thread and run one future to completion // we can pin the `Future` to the stack. This is unsafe, but saves an // allocation. We could `Box::pin` it too if we wanted. This is however // safe since we don't move the `Future` here. let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { // when the Future is ready we're finished Poll::Ready(val) => break val, // If we get a `pending` future we just go to sleep... Poll::Pending => thread::park(), }; }; val\n} Inn all the examples here I've chose to comment the code extensively. I find it easier to follow that way than dividing if up into many paragraphs. We'll see more about the Waker in the next paragraph, but just look at it like a trait object similar to the one we constructed in the first chapter. Context is just a wrapper around the Waker. At the time of writing this book it's nothing more. In the future it might be possible that the Context object will do more than just wrapping a Future so having this extra abstraction gives some flexibility. You'll notice how we use Pin here to pin the future when we poll it. Now that you've read so much about Generators and Pin already this should be rather easy to understand. Future is a state machine, every await point is a yield point. We could borrow data across await points and we meet the exact same challenges as we do when borrowing across yield points. As we explained in the chapter about generators , we use Pin and the guarantees that give us to allow Futures to have self references.","breadcrumbs":"The Executor","id":"38","title":"The Executor"},"39":{"body":"In Rust we call an interruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. We can chain these Futures so that once a \"leaf future\" is ready we'll perform a set of operations. These chained operations can spawn new leaf futures themselves. Our Future implementation looks like this: // This is the definition of our `Waker`. We use a regular thread-handle here.\n// It works but it's not a good solution. It's easy to fix though, I'll explain\n// after this code snippet.\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} // This is the definition of our `Future`. It keeps all the information we\n// need. This one holds a reference to our `reactor`, that's just to make\n// this example as easy as possible. It doesn't need to hold a reference to\n// the whole reactor, but it needs to be able to register itself with the\n// reactor.\n#[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} // These are function definitions we'll use for our waker. Remember the\n// \"Trait Objects\" chapter earlier.\nfn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} // Since we use an `Arc` cloning is just increasing the refcount on the smart\n// pointer.\nfn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} // This is actually a \"helper funtcion\" to create a `Waker` vtable. In contrast\n// to when we created a `Trait Object` from scratch we don't need to concern\n// ourselves with the actual layout of the `vtable` and only provide a fixed\n// set of functions\nconst VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; // Instead of implementing this on the `MyWaker` oject in `impl Mywaker...` we\n// just use this pattern instead since it saves us some lines of code.\nfn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} // This is our `Future` implementation\nimpl Future for Task { // The output for our kind of `leaf future` is just an `usize`. For other // futures this could be something more interesting like a byte array. type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); // we check with the `Reactor` if this future is in its \"readylist\" // i.e. if it's `Ready` if r.is_ready(self.id) { // if it is, we return the data. In this case it's just the ID of // the task since this is just a very simple example. Poll::Ready(self.id) } else if self.is_registered { // If the future is registered alredy, we just return `Pending` Poll::Pending } else { // If we get here, it must be the first time this `Future` is polled // so we register a task with our `reactor` r.register(self.data, cx.waker().clone(), self.id); // oh, we have to drop the lock on our `Mutex` here because we can't // have a shared and exclusive borrow at the same time drop(r); self.is_registered = true; Poll::Pending } }\n} This is mostly pretty straight forward. The confusing part is the strange way we need to construct the Waker, but since we've already created our own trait objects from raw parts, this looks pretty familiar. Actually, it's even a bit easier. We use an Arc here to pass out a ref-counted borrow of our MyWaker. This is pretty normal, and makes this easy and safe to work with. Cloning a Waker is just increasing the refcount in this case. Dropping a Waker is as easy as decreasing the refcount. Now, in special cases we could choose to not use an Arc. So this low-level method is there to allow such cases. Indeed, if we only used Arc there is no reason for us to go through all the trouble of creating our own vtable and a RawWaker. We could just implement a normal trait. Fortunately, in the future this will probably be possible in the standard library as well. For now, this trait lives in the nursery , but my guess is that this will be a part of the standard library after som maturing. We choose to pass in a reference to the whole Reactor here. This isn't normal. The reactor will often be a global resource which let's us register interests without passing around a reference.","breadcrumbs":"The Future implementation","id":"39","title":"The Future implementation"},"4":{"body":"Now, one way of accomplishing this is letting the OS take care of everything for us. We do this by simply spawning a new OS thread for each task we want to accomplish and write code like we normally would. The runtime we use to handle concurrency for us is the operating system itself. Advantages: Simple Easy to use Switching between tasks is reasonably fast You get parallelism for free Drawbacks: OS level threads come with a rather large stack. If you have many tasks waiting simultaneously (like you would in a web-server under heavy load) you'll run out of memory pretty fast. There are a lot of syscalls involved. This can be pretty costly when the number of tasks is high. The OS has many things it needs to handle. It might not switch back to your thread as fast as you'd wish. Might not be an option on some systems Using OS threads in Rust looks like this: use std::thread; fn main() { println!(\"So we start the program here!\"); let t1 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(200)); println!(\"We create tasks which gets run when they're finished!\"); }); let t2 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(100)); println!(\"We can even chain callbacks...\"); let t3 = thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(50)); println!(\"...like this!\"); }); t3.join().unwrap(); }); println!(\"While our tasks are executing we can do other stuff here.\"); t1.join().unwrap(); t2.join().unwrap();\n} OS threads sure has some pretty big advantages. So why all this talk about \"async\" and concurrency in the first place? First of all. For computers to be efficient it needs to multitask. Once you start to look under the covers (like how an operating system works ) you'll see concurrency everywhere. It's very fundamental in everything we do. Secondly, we have the web. Webservers is all about I/O and handling small tasks (requests). When the number of small tasks is large it's not a good fit for OS threads as of today because of the memory they require and the overhead involved when creating new threads. This gets even more relevant when the load is variable which means the current number of tasks a program has at any point in time is unpredictable. That's why you'll see so many async web frameworks and database drivers today. However, for a huge number of problems, the standard OS threads will often be the right solution. So, just think twice about your problem before you reach for an async library. Now, let's look at some other options for multitasking. They all have in common that they implement a way to do multitasking by having a \"userland\" runtime:","breadcrumbs":"Threads provided by the operating system","id":"4","title":"Threads provided by the operating system"},"40":{"body":"It could deadlock easily since anyone could get a handle to the executor thread and call park/unpark on it. If one of our Futures holds a handle to our thread, or any unrelated code calls unpark on our thread, the following could happen: A future could call unpark on the executor thread from a different thread Our executor thinks that data is ready and wakes up and polls the future The future is not ready yet when polled, but at that exact same time the Reactor gets an event and calls wake() which also unparks our thread. This could happen before we go to sleep again since these processes run in parallel. Our reactor has called wake but our thread is still sleeping since it was awake already at that point. We're deadlocked and our program stops working There is also the case that our thread could have what's called a spurious wakeup ( which can happen unexpectedly ), which could cause the same deadlock if we're unlucky. There are many better solutions, here are some: Use std::sync::CondVar Use crossbeam::sync::Parker","breadcrumbs":"Why using thread park/unpark is a bad idea for a library","id":"40","title":"Why using thread park/unpark is a bad idea for a library"},"41":{"body":"This is the home stretch, and not strictly Future related, but we need one to have an example to run. Since concurrency mostly makes sense when interacting with the outside world (or at least some peripheral), we need something to actually abstract over this interaction in an asynchronous way. This is the Reactors job. Most often you'll see reactors in Rust use a library called Mio , which provides non blocking APIs and event notification for several platforms. The reactor will typically give you something like a TcpStream (or any other resource) which you'll use to create an I/O request. What you get in return is a Future. If the Reactor is registered as a global resource (which is pretty normal), our Task in would instead be a special TcpStream which registers interest with the global Reactor and no reference is needed. We can call this kind of Future a \"leaf Future\", since it's some operation we'll actually wait on and that we can chain operations on which are performed once the leaf future is ready. Our Reactor will look like this: // This is a \"fake\" reactor. It does no real I/O, but that also makes our\n// code possible to run in the book and in the playground\nstruct Reactor { // we need some way of registering a Task with the reactor. Normally this // would be an \"interest\" in an I/O event dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, // This is a list of tasks that are ready, which means they should be polled // for data. readylist: Arc<Mutex<Vec<usize>>>,\n} // We just have two kind of events. An event called `Timeout`\n// and a `Close` event to close down our reactor.\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { // The way we register new events with our reactor is using a regular // channel let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); // This `Vec` will hold handles to all threads we spawn so we can // join them later on and finish our programm in a good manner let mut handles = vec![]; // This will be the \"Reactor thread\" let handle = thread::spawn(move || { for event in rx { let rl_clone = rl_clone.clone(); match event { // If we get a close event we break out of the loop we're in Event::Close => break, Event::Timeout(waker, duration, id) => { // When we get an event we simply spawn a new thread // which will simulate some I/O resource... let event_handle = thread::spawn(move || { //... by sleeping for the number of seconds // we provided when creating the `Task`. thread::sleep(Duration::from_secs(duration)); // When it's done sleeping we put the ID of this task // on the \"readylist\" rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); // Then we call `wake` which will wake up our // executor and start polling the futures waker.wake(); }); handles.push(event_handle); } } } // When we exit the Reactor we first join all the handles on // the child threads we've spawned so we catch any panics and // release any resources. for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { // registering an event is as simple as sending an `Event` through // the channel. self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } // We need a way to check if any event's are ready. This will simply // look through the \"readylist\" for an event macthing the ID we want to // check for. fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} // When our `Reactor` is dropped we join the reactor thread with the thread\n// owning our `Reactor` so we catch any panics and release all resources.\n// It's not needed for this to work, but it really is a best practice to join\n// all threads you spawn.\nimpl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} It's a lot of code though, but essentially we just spawn off a new thread and make it sleep for some time which we specify when we create a Task. Now, let's test our code and see if it works. This code is actually runnable if you press the \"play\" button. Since we're sleeping for a couple of seconds here, just give it some time to run. In the last chapter we have the whole 200 lines in an editable window . You can also copy that or edit it right in this book. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\n# fn main() { // This is just to make it easier for us to see when our Future was resolved let start = Instant::now(); // Many runtimes create a glocal `reactor` we pass it as an argument let reactor = Reactor::new(); // Since we'll share this between threads we wrap it in a // atmically-refcounted- mutex. let reactor = Arc::new(Mutex::new(reactor)); // We create two tasks: // - first parameter is the `reactor` // - the second is a timeout in seconds // - the third is an `id` to identify the task let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); // an `async` block works the same way as an `async fn` in that it compiles // our code into a state machine, `yielding` at every `await` point. let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // Our executor can only run one and one future, this is pretty normal // though. You have a set of operations containing many futures that // ends up as a single future that drives them all to completion. let mainfut = async { fut1.await; fut2.await; }; // This executor will block the main thread until the futures is resolved block_on(mainfut); // When we're done, we want to shut down our reactor thread so our program // ends nicely. reactor.lock().map(|mut r| r.close()).unwrap();\n} # // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } I added a debug printout of the events the reactor registered interest for so we can observe two things: How the Waker object looks just like the trait object we talked about in an earlier chapter In what order the events register interest with the reactor The last point is relevant when we move on the the last paragraph.","breadcrumbs":"The Reactor","id":"41","title":"The Reactor"},"42":{"body":"This is the first time we actually see the async/await syntax so let's finish this book by explaining them briefly. Hopefully, the await syntax looks pretty familiar. It has a lot in common with yield and indeed, it works in much the same way. The async keyword can be used on functions as in async fn(...) or on a block as in async { ... }. Both will turn your function, or block, into a Future. These Futures are rather simple. Imagine our generator from a few chapters back. Every await point is like a yield point. Instead of yielding a value we pass in, it yields the Future we're awaiting. In turn this Future is polled. Now, as is the case in our code, our mainfut contains two non-leaf futures which it awaits, and all that happens is that these state machines are polled as well until some \"leaf future\" in the end is finally polled and either returns Ready or Pending. The way our example is right now, it's not much better than regular synchronous code. For us to actually await multiple futures at the same time we somehow need to spawn them so they're polled once, but does not cause our thread to sleep and wait for them one after one. Our example as it stands now returns this: Future got 1 at time: 1.00.\nFuture got 2 at time: 3.00. If these Futures were executed asynchronously we would expect to see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. To accomplish this we can create the simplest possible spawn function I could come up with: fn spawn<F: Future>(future: F) -> Pin<Box<F>> { // We start off the same way as we did before let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); // But we need to Box this Future. We can't pin it to this stack frame // since we'll return before the `Future` is resolved so it must be pinned // to the heap. let mut boxed = Box::pin(future); // Now we poll and just discard the result. This way, we register a `Waker` // with our `Reactor` and kick of whatever operation we're expecting. let _ = Future::poll(boxed.as_mut(), &mut cx); // We still need this `Future` since we'll await it later so we return it... boxed\n} Now if we change our code in main to look like this instead. # use std::{\n# future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex},\n# task::{Context, Poll, RawWaker, RawWakerVTable, Waker},\n# thread::{self, JoinHandle}, time::{Duration, Instant}\n# };\nfn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; // You'll notice everything stays the same until this point let mainfut = async { // Here we \"kick off\" our first `Future` let handle1 = spawn(fut1); // And the second one let handle2 = spawn(fut2); // Now, they're already started, and when they get polled in our // executor now they will just return `Pending`, or if we somehow used // so much time that they're already resolved, they will return `Ready`. handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n}\n# // ============================= EXECUTOR ====================================\n# fn block_on<F: Future>(mut future: F) -> F::Output {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker));\n# let mut cx = Context::from_waker(&waker);\n# let val = loop {\n# let pinned = unsafe { Pin::new_unchecked(&mut future) };\n# match Future::poll(pinned, &mut cx) {\n# Poll::Ready(val) => break val,\n# Poll::Pending => thread::park(),\n# };\n# };\n# val\n# }\n# # fn spawn<F: Future>(future: F) -> Pin<Box<F>> {\n# let mywaker = Arc::new(MyWaker{ thread: thread::current() }); # let waker = waker_into_waker(Arc::into_raw(mywaker)); # let mut cx = Context::from_waker(&waker); # let mut boxed = Box::pin(future);\n# let _ = Future::poll(boxed.as_mut(), &mut cx); # boxed\n# }\n# # // ====================== FUTURE IMPLEMENTATION ==============================\n# #[derive(Clone)]\n# struct MyWaker {\n# thread: thread::Thread,\n# }\n# # #[derive(Clone)]\n# pub struct Task {\n# id: usize,\n# reactor: Arc<Mutex<Reactor>>,\n# data: u64,\n# is_registered: bool,\n# }\n# # fn mywaker_wake(s: &MyWaker) {\n# let waker_ptr: *const MyWaker = s;\n# let waker_arc = unsafe {Arc::from_raw(waker_ptr)};\n# waker_arc.thread.unpark();\n# }\n# # fn mywaker_clone(s: &MyWaker) -> RawWaker {\n# let arc = unsafe { Arc::from_raw(s).clone() };\n# std::mem::forget(arc.clone()); // increase ref count\n# RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n# }\n# # const VTABLE: RawWakerVTable = unsafe {\n# RawWakerVTable::new(\n# |s| mywaker_clone(&*(s as *const MyWaker)), // clone\n# |s| mywaker_wake(&*(s as *const MyWaker)), // wake\n# |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref\n# |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount\n# )\n# };\n# # fn waker_into_waker(s: *const MyWaker) -> Waker {\n# let raw_waker = RawWaker::new(s as *const (), &VTABLE);\n# unsafe { Waker::from_raw(raw_waker) }\n# }\n# # impl Task {\n# fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self {\n# Task {\n# id,\n# reactor,\n# data,\n# is_registered: false,\n# }\n# }\n# }\n# # impl Future for Task {\n# type Output = usize;\n# fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {\n# let mut r = self.reactor.lock().unwrap();\n# if r.is_ready(self.id) {\n# Poll::Ready(self.id)\n# } else if self.is_registered {\n# Poll::Pending\n# } else {\n# r.register(self.data, cx.waker().clone(), self.id);\n# drop(r);\n# self.is_registered = true;\n# Poll::Pending\n# }\n# }\n# }\n# # // =============================== REACTOR ===================================\n# struct Reactor {\n# dispatcher: Sender<Event>,\n# handle: Option<JoinHandle<()>>,\n# readylist: Arc<Mutex<Vec<usize>>>,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Timeout(Waker, u64, usize),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::<Event>();\n# let readylist = Arc::new(Mutex::new(vec![]));\n# let rl_clone = readylist.clone();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# println!(\"REACTOR: {:?}\", event);\n# let rl_clone = rl_clone.clone();\n# match event {\n# Event::Close => break,\n# Event::Timeout(waker, duration, id) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# rl_clone.lock().map(|mut rl| rl.push(id)).unwrap();\n# waker.wake();\n# });\n# # handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# readylist,\n# dispatcher: tx,\n# handle: Some(handle),\n# }\n# }\n# # fn register(&mut self, duration: u64, waker: Waker, data: usize) {\n# self.dispatcher\n# .send(Event::Timeout(waker, duration, data))\n# .unwrap();\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).unwrap();\n# }\n# # fn is_ready(&self, id_to_check: usize) -> bool {\n# self.readylist\n# .lock()\n# .map(|rl| rl.iter().any(|id| *id == id_to_check))\n# .unwrap()\n# }\n# }\n# # impl Drop for Reactor {\n# fn drop(&mut self) {\n# self.handle.take().map(|h| h.join().unwrap()).unwrap();\n# }\n# } Now, if we try to run our example again If you add this code to our example and run it, you'll see: Future got 1 at time: 1.00.\nFuture got 2 at time: 2.00. Exactly as we expected. Now this spawn method is not very sophisticated but it explains the concept. I've challenged you to create a better version and pointed you at a better resource in the next chapter under reader exercises . That's actually it for now. There are probably much more to learn, but I think it will be easier once the fundamental concepts are there and that further exploration will get a lot easier. Don't forget the exercises in the last chapter 😊. Have fun until the next time!","breadcrumbs":"Async/Await and concurrent Futures","id":"42","title":"Async/Await and concurrent Futures"},"43":{"body":"Here is the whole example. You can edit it right here in your browser and run it yourself. Have fun! use std::{ future::Future, pin::Pin, sync::{mpsc::{channel, Sender}, Arc, Mutex}, task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, thread::{self, JoinHandle}, time::{Duration, Instant}\n}; fn main() { let start = Instant::now(); let reactor = Reactor::new(); let reactor = Arc::new(Mutex::new(reactor)); let future1 = Task::new(reactor.clone(), 1, 1); let future2 = Task::new(reactor.clone(), 2, 2); let fut1 = async { let val = future1.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let fut2 = async { let val = future2.await; let dur = (Instant::now() - start).as_secs_f32(); println!(\"Future got {} at time: {:.2}.\", val, dur); }; let mainfut = async { let handle1 = spawn(fut1); let handle2 = spawn(fut2); handle1.await; handle2.await; }; block_on(mainfut); reactor.lock().map(|mut r| r.close()).unwrap();\n} // ============================= EXECUTOR ====================================\nfn block_on<F: Future>(mut future: F) -> F::Output { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let val = loop { let pinned = unsafe { Pin::new_unchecked(&mut future) }; match Future::poll(pinned, &mut cx) { Poll::Ready(val) => break val, Poll::Pending => thread::park(), }; }; val\n} fn spawn<F: Future>(future: F) -> Pin<Box<F>> { let mywaker = Arc::new(MyWaker{ thread: thread::current() }); let waker = waker_into_waker(Arc::into_raw(mywaker)); let mut cx = Context::from_waker(&waker); let mut boxed = Box::pin(future); let _ = Future::poll(boxed.as_mut(), &mut cx); boxed\n} // ====================== FUTURE IMPLEMENTATION ==============================\n#[derive(Clone)]\nstruct MyWaker { thread: thread::Thread,\n} #[derive(Clone)]\npub struct Task { id: usize, reactor: Arc<Mutex<Reactor>>, data: u64, is_registered: bool,\n} fn mywaker_wake(s: &MyWaker) { let waker_ptr: *const MyWaker = s; let waker_arc = unsafe {Arc::from_raw(waker_ptr)}; waker_arc.thread.unpark();\n} fn mywaker_clone(s: &MyWaker) -> RawWaker { let arc = unsafe { Arc::from_raw(s).clone() }; std::mem::forget(arc.clone()); // increase ref count RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)\n} const VTABLE: RawWakerVTable = unsafe { RawWakerVTable::new( |s| mywaker_clone(&*(s as *const MyWaker)), // clone |s| mywaker_wake(&*(s as *const MyWaker)), // wake |s| mywaker_wake(*(s as *const &MyWaker)), // wake by ref |s| drop(Arc::from_raw(s as *const MyWaker)), // decrease refcount )\n}; fn waker_into_waker(s: *const MyWaker) -> Waker { let raw_waker = RawWaker::new(s as *const (), &VTABLE); unsafe { Waker::from_raw(raw_waker) }\n} impl Task { fn new(reactor: Arc<Mutex<Reactor>>, data: u64, id: usize) -> Self { Task { id, reactor, data, is_registered: false, } }\n} impl Future for Task { type Output = usize; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut r = self.reactor.lock().unwrap(); if r.is_ready(self.id) { Poll::Ready(self.id) } else if self.is_registered { Poll::Pending } else { r.register(self.data, cx.waker().clone(), self.id); drop(r); self.is_registered = true; Poll::Pending } }\n} // =============================== REACTOR ===================================\nstruct Reactor { dispatcher: Sender<Event>, handle: Option<JoinHandle<()>>, readylist: Arc<Mutex<Vec<usize>>>,\n}\n#[derive(Debug)]\nenum Event { Close, Timeout(Waker, u64, usize),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::<Event>(); let readylist = Arc::new(Mutex::new(vec![])); let rl_clone = readylist.clone(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { println!(\"REACTOR: {:?}\", event); let rl_clone = rl_clone.clone(); match event { Event::Close => break, Event::Timeout(waker, duration, id) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); rl_clone.lock().map(|mut rl| rl.push(id)).unwrap(); waker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { readylist, dispatcher: tx, handle: Some(handle), } } fn register(&mut self, duration: u64, waker: Waker, data: usize) { self.dispatcher .send(Event::Timeout(waker, duration, data)) .unwrap(); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); } fn is_ready(&self, id_to_check: usize) -> bool { self.readylist .lock() .map(|rl| rl.iter().any(|id| *id == id_to_check)) .unwrap() }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n}","breadcrumbs":"Our finished code","id":"43","title":"Our finished code"},"44":{"body":"Congratulations. Good job! If you got this far you must have stayed with me all the way. I hope you enjoyed the ride! I'll leave you with some predictions and a set of exercises I'm suggesting for those interested. Futures will be more ergonomic to use with time. For example, instead of having to create a RawWaker and so on, the Waker will also be possible to implement as a normal Trait. It's probably going to be pretty similar to ArcWake . There will probably be several more improvements like this, but since relatively few people will actually need implement leaf Futures compared to those that use them, focus will first and foremost be on how ergonomic it's to work with futures inside async/await functions and blocks. It will still take some time for the ecosystem to migrate over to Futures 3.0 but since the advantages are so huge, it will not be a split between libraries using Futures 1.0 and libraries using Futures 3.0 for long.","breadcrumbs":"Conclusion and exercises","id":"44","title":"Conclusion and exercises"},"45":{"body":"So our implementation has taken some obvious shortcuts and could use some improvement. Actually digging into the code and try things yourself is a good way to learn. Here are some good exercises if you want to explore more:","breadcrumbs":"Reader exercises","id":"45","title":"Reader exercises"},"46":{"body":"The big problem using Thread::park and Thread::unpark is that the user can access these same methods from their own code. Try to use another method to suspend our thread and wake it up again on our command. Some hints: Check out CondVars, here are two sources Wikipedia and the docs for CondVar Take a look at crates that help you with this exact problem like Crossbeam (specifically the Parker )","breadcrumbs":"Avoid thread::park","id":"46","title":"Avoid thread::park"},"47":{"body":"First of all, protecting the whole Reactor and passing it around is overkill. We're only interested in synchronizing some parts of the information it contains. Try to refactor that out and only synchronize access to what's really needed. Do you want to pass around a reference to this information using an Arc? Do you want to make a global Reactor so it can be accessed from anywhere? Next , using a Mutex as a synchronization mechanism might be overkill since many methods only reads data. Could an RwLock be more efficient some places? Could you use any of the synchronization mechanisms in Crossbeam ? Do you want to dig into atomics in Rust and implement a synchronization mechanism of your own?","breadcrumbs":"Avoid wrapping the whole Reactor in a mutex and pass it around","id":"47","title":"Avoid wrapping the whole Reactor in a mutex and pass it around"},"48":{"body":"Right now we create a new instance of a Waker for every event we create. Is this really needed? Could we create one instance and then cache it (see this article from u/sjepang )? Should we cache it in thread_local! storage? Or should be cache it using a global constant?","breadcrumbs":"Avoid creating a new Waker for every event","id":"48","title":"Avoid creating a new Waker for every event"},"49":{"body":"What about CPU intensive tasks? Right now they'll prevent our executor thread from progressing an handling events. Could you create a thread pool and create a method to send such tasks to the thread pool instead together with a Waker which will wake up the executor thread once the CPU intensive task is done? In both async_std and tokio this method is called spawn_blocking, a good place to start is to read the documentation and the code thy use to implement that.","breadcrumbs":"Could we implement more methods on our executor?","id":"49","title":"Could we implement more methods on our executor?"},"5":{"body":"Green threads uses the same mechanism as an OS does by creating a thread for each task, setting up a stack, save the CPU's state and jump from one task(thread) to another by doing a \"context switch\". We yield control to the scheduler (which is a central part of the runtime in such a system) which then continues running a different task. Rust had green threads once, but they were removed before it hit 1.0. The state of execution is stored in each stack so in such a solution there would be no need for async, await, Futures or Pin. All this would be implementation details for the library. The typical flow will be like this: Run som non-blocking code Make a blocking call to some external resource CPU jumps to the \"main\" thread which schedules a different thread to run and \"jumps\" to that stack Run some non-blocking code on the new thread until a new blocking call or the task is finished \"jumps\" back to the \"main\" thread, schedule a new thread to run and jump to that These \"jumps\" are know as context switches. Your OS is doing it many times each second as you read this. Advantages: Simple to use. The code will look like it does when using OS threads. A \"context switch\" is reasonably fast Each stack only gets a little memory to start with so you can have hundred of thousands of green threads running. It's easy to incorporate preemtion which puts a lot of control in the hands of the runtime implementors. Drawbacks: The stacks might need to grow. Solving this is not easy and will have a cost. You need to save all the CPU state on every switch It's not a zero cost abstraction (Rust had green threads early on and this was one of the reasons they were removed). Complicated to implement correctly if you want to support many different platforms. If you were to implement green threads in Rust, it could look something like this: The example presented below is an adapted example from an earlier gitbook I wrote about green threads called Green Threads Explained in 200 lines of Rust. If you want to know what's going on you'll find everything explained in detail in that book. The code below is wildly unsafe and it's just to show a real example. It's not in any way meant to showcase \"best practice\". Just so we're on the same page. #![feature(asm)]\n#![feature(naked_functions)]\nuse std::ptr; const DEFAULT_STACK_SIZE: usize = 1024 * 1024 * 2;\nconst MAX_THREADS: usize = 4;\nstatic mut RUNTIME: usize = 0; pub struct Runtime { threads: Vec<Thread>, current: usize,\n} #[derive(PartialEq, Eq, Debug)]\nenum State { Available, Running, Ready,\n} struct Thread { id: usize, stack: Vec<u8>, ctx: ThreadContext, state: State, task: Option<Box<dyn Fn()>>,\n} #[derive(Debug, Default)]\n#[repr(C)]\nstruct ThreadContext { rsp: u64, r15: u64, r14: u64, r13: u64, r12: u64, rbx: u64, rbp: u64, thread_ptr: u64,\n} impl Thread { fn new(id: usize) -> Self { Thread { id, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Available, task: None, } }\n} impl Runtime { pub fn new() -> Self { let base_thread = Thread { id: 0, stack: vec![0_u8; DEFAULT_STACK_SIZE], ctx: ThreadContext::default(), state: State::Running, task: None, }; let mut threads = vec![base_thread]; threads[0].ctx.thread_ptr = &threads[0] as *const Thread as u64; let mut available_threads: Vec<Thread> = (1..MAX_THREADS).map(|i| Thread::new(i)).collect(); threads.append(&mut available_threads); Runtime { threads, current: 0, } } pub fn init(&self) { unsafe { let r_ptr: *const Runtime = self; RUNTIME = r_ptr as usize; } } pub fn run(&mut self) -> ! { while self.t_yield() {} std::process::exit(0); } fn t_return(&mut self) { if self.current != 0 { self.threads[self.current].state = State::Available; self.t_yield(); } } fn t_yield(&mut self) -> bool { let mut pos = self.current; while self.threads[pos].state != State::Ready { pos += 1; if pos == self.threads.len() { pos = 0; } if pos == self.current { return false; } } if self.threads[self.current].state != State::Available { self.threads[self.current].state = State::Ready; } self.threads[pos].state = State::Running; let old_pos = self.current; self.current = pos; unsafe { switch(&mut self.threads[old_pos].ctx, &self.threads[pos].ctx); } true } pub fn spawn<F: Fn() + 'static>(f: F){ unsafe { let rt_ptr = RUNTIME as *mut Runtime; let available = (*rt_ptr) .threads .iter_mut() .find(|t| t.state == State::Available) .expect(\"no available thread.\"); let size = available.stack.len(); let s_ptr = available.stack.as_mut_ptr(); available.task = Some(Box::new(f)); available.ctx.thread_ptr = available as *const Thread as u64; ptr::write(s_ptr.offset((size - 8) as isize) as *mut u64, guard as u64); ptr::write(s_ptr.offset((size - 16) as isize) as *mut u64, call as u64); available.ctx.rsp = s_ptr.offset((size - 16) as isize) as u64; available.state = State::Ready; } }\n} fn call(thread: u64) { let thread = unsafe { &*(thread as *const Thread) }; if let Some(f) = &thread.task { f(); }\n} #[naked]\nfn guard() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; let rt = &mut *rt_ptr; println!(\"THREAD {} FINISHED.\", rt.threads[rt.current].id); rt.t_return(); };\n} pub fn yield_thread() { unsafe { let rt_ptr = RUNTIME as *mut Runtime; (*rt_ptr).t_yield(); };\n} #[naked]\n#[inline(never)]\nunsafe fn switch(old: *mut ThreadContext, new: *const ThreadContext) { asm!(\" mov %rsp, 0x00($0) mov %r15, 0x08($0) mov %r14, 0x10($0) mov %r13, 0x18($0) mov %r12, 0x20($0) mov %rbx, 0x28($0) mov %rbp, 0x30($0) mov 0x00($1), %rsp mov 0x08($1), %r15 mov 0x10($1), %r14 mov 0x18($1), %r13 mov 0x20($1), %r12 mov 0x28($1), %rbx mov 0x30($1), %rbp mov 0x38($1), %rdi ret \" : : \"r\"(old), \"r\"(new) : : \"alignstack\" );\n}\n# #[cfg(not(windows))]\nfn main() { let mut runtime = Runtime::new(); runtime.init(); Runtime::spawn(|| { println!(\"I haven't implemented a timer in this example.\"); yield_thread(); println!(\"Finally, notice how the tasks are executed concurrently.\"); }); Runtime::spawn(|| { println!(\"But we can still nest tasks...\"); Runtime::spawn(|| { println!(\"...like this!\"); }) }); runtime.run();\n}\n# #[cfg(windows)]\n# fn main() { } Still hanging in there? Good. Don't get frustrated if the code above is difficult to understand. If I hadn't written it myself I would probably feel the same. You can always go back and read the book which explains it later.","breadcrumbs":"Green threads","id":"5","title":"Green threads"},"50":{"body":"Right now, we can only run one and one future. Most runtimes has a spawn function which let's you start off a future and await it later so you can run multiple futures concurrently. As I'm writing this @stjepan is writing a blog series about implementing your own executors, and he just released a post on how to accomplish just this you can visit here . He knows what he's talking about so I recommend following that. In the bonus_spawn branch of the example repository you can also find an extremely simplified (and worse) way of accomplishing the same in only a few lines of code.","breadcrumbs":"Building a better exectuor","id":"50","title":"Building a better exectuor"},"51":{"body":"There are many great resources for further study. In addition to the RFCs and articles I've already linked to in the book, here are some of my suggestions: The official Asyc book The async_std book Aron Turon: Designing futures for Rust Steve Klabnik's presentation: Rust's journey to Async/Await The Tokio Blog Stjepan's blog with a series where he implements an Executor Jon Gjengset's video on The Why, What and How of Pinning in Rust Withoutboats blog series about async/await","breadcrumbs":"Further reading","id":"51","title":"Further reading"},"6":{"body":"You probably already know what we're going to talk about in the next paragraphs from Javascript which I assume most know. If your exposure to Javascript has given you any sorts of PTSD earlier in life, close your eyes now and scroll down for 2-3 seconds. You'll find a link there that takes you to safety. The whole idea behind a callback based approach is to save a pointer to a set of instructions we want to run later. We can save that pointer on the stack before we yield control to the runtime, or in some sort of collection as we do below. The basic idea of not involving threads as a primary way to achieve concurrency is the common denominator for the rest of the approaches. Including the one Rust uses today which we'll soon get to. Advantages: Easy to implement in most languages No context switching Low memory overhead (in most cases) Drawbacks: Each task must save the state it needs for later, the memory usage will grow linearly with the number of callbacks in a chain of computations. Can be hard to reason about, many people already know this as as \"callback hell\". It's a very different way of writing a program, and it can be difficult to get an understanding of the program flow. Sharing state between tasks is a hard problem in Rust using this approach due to it's ownership model. An extremely simplified example of a how a callback based approach could look like is: fn program_main() { println!(\"So we start the program here!\"); set_timeout(200, || { println!(\"We create tasks which gets run when they're finished!\"); }); set_timeout(100, || { println!(\"We can even chain callbacks...\"); set_timeout(50, || { println!(\"...like this!\"); }) }); println!(\"While our tasks are executing we can do other stuff here.\");\n} fn main() { RT.with(|rt| rt.run(program_main));\n} use std::sync::mpsc::{channel, Receiver, Sender};\nuse std::{cell::RefCell, collections::HashMap, thread}; thread_local! { static RT: Runtime = Runtime::new();\n} struct Runtime { callbacks: RefCell<HashMap<usize, Box<dyn FnOnce() -> ()>>>, next_id: RefCell<usize>, evt_sender: Sender<usize>, evt_reciever: Receiver<usize>,\n} fn set_timeout(ms: u64, cb: impl FnOnce() + 'static) { RT.with(|rt| { let id = *rt.next_id.borrow(); *rt.next_id.borrow_mut() += 1; rt.callbacks.borrow_mut().insert(id, Box::new(cb)); let evt_sender = rt.evt_sender.clone(); thread::spawn(move || { thread::sleep(std::time::Duration::from_millis(ms)); evt_sender.send(id).unwrap(); }); });\n} impl Runtime { fn new() -> Self { let (evt_sender, evt_reciever) = channel(); Runtime { callbacks: RefCell::new(HashMap::new()), next_id: RefCell::new(1), evt_sender, evt_reciever, } } fn run(&self, program: fn()) { program(); for evt_id in &self.evt_reciever { let cb = self.callbacks.borrow_mut().remove(&evt_id).unwrap(); cb(); if self.callbacks.borrow().is_empty() { break; } } }\n} We're keeping this super simple, and you might wonder what's the difference between this approach and the one using OS threads an passing in the callbacks to the OS threads directly. 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\ No newline at end of file
diff --git a/src/0_background_information.md b/src/0_background_information.md
index 109c723..ba54468 100644
--- a/src/0_background_information.md
+++ b/src/0_background_information.md
@@ -90,12 +90,17 @@ runtime:
 
 ## Green threads
 
-Green threads has been popularized by GO in the recent years. Green threads
-uses the same basic technique as operating systems does to handle concurrency.
+Green threads uses the same mechanism as an OS does by creating a thread for
+each task, setting up a stack, save the CPU's state and jump from one
+task(thread) to another by doing a "context switch".
 
-Green threads are implemented by setting up a stack for each task you want to
-execute and make the CPU "jump" from one stack to another to switch between
-tasks.
+We yield control to the scheduler (which is a central part of the runtime in
+such a system) which then continues running a different task.
+
+Rust had green threads once, but they were removed before it hit 1.0. The state
+of execution is stored in each stack so in such a solution there would be no
+need for async, await, Futures or Pin. All this would be implementation details
+for the library.
 
 The typical flow will be like this:
 
@@ -105,7 +110,7 @@ The typical flow will be like this:
    "jumps" to that stack
 4. Run some non-blocking code on the new thread until a new blocking call or the
    task is finished
-5. "jumps" back to the "main" thread and so on
+5. "jumps" back to the "main" thread, schedule a new thread to run and jump to that
 
 These "jumps" are know as context switches. Your OS is doing it many times each
 second as you read this.
@@ -529,7 +534,7 @@ async function run() {
 You can consider the `run` function a _pausable_ task consisting of several
 sub-tasks. On each "await" point it yields control to the scheduler (in this
 case it's the well known Javascript event loop). Once one of the sub-tasks changes
-state to either `fulfilled` or `rejected` the task is sheduled to continue to
+state to either `fulfilled` or `rejected` the task is scheduled to continue to
 the next step.
 
 Syntactically, Rusts Futures 1.0 was a lot like the promises example above and
diff --git a/src/1_futures_in_rust.md b/src/1_futures_in_rust.md
index 549ad65..27b6a6a 100644
--- a/src/1_futures_in_rust.md
+++ b/src/1_futures_in_rust.md
@@ -101,7 +101,7 @@ The difference between Rust and other languages is that you have to make an
 active choice when it comes to picking a runtime. Most often, in other languages
 you'll just use the one provided for you.
 
-An async runtime can be divided into two parts:
+**An async runtime can be divided into two parts:**
 
 1. The Executor
 2. The Reactor
diff --git a/src/2_waker_context.md b/src/2_waker_context.md
index d9d5780..5dccd9d 100644
--- a/src/2_waker_context.md
+++ b/src/2_waker_context.md
@@ -1,6 +1,6 @@
 # Waker and Context
 
-> **Relevant for:**
+> **Overview:**
 >
 > - Understanding how the Waker object is constructed
 > - Learning how the runtime know when a leaf-future can resume
@@ -101,7 +101,7 @@ object from these parts:
 and try to run it. If you want to go back, press the undo symbol. Keep an eye
 out for these as we go forward. Many examples will be editable.
 
-```rust, editable
+```rust
 // A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr)
 trait Test {
     fn add(&self) -> i32;
@@ -160,7 +160,6 @@ fn main() {
     println!("Sub: 3 - 2 = {}", test.sub());
     println!("Mul: 3 * 2 = {}", test.mul());
 }
-
 ```
 
 Now that you know this you also know why how we implement the `Waker` type
diff --git a/src/3_generators_pin.md b/src/3_generators_pin.md
index b1e7c5f..d8d1fd6 100644
--- a/src/3_generators_pin.md
+++ b/src/3_generators_pin.md
@@ -1,10 +1,10 @@
 # Generators
 
->**Relevant for:**
+>**Overview:**
 >
->- Understanding how the async/await syntax works since it's how `await` is implemented
->- Knowing why we need `Pin`
->- Understanding why Rusts async model is very efficient
+>- Understandi how the async/await syntax works since it's how `await` is implemented
+>- Know why we need `Pin`
+>- Understand why Rusts async model is very efficient
 >
 >The motivation for `Generators` can be found in [RFC#2033][rfc2033]. It's very
 >well written and I can recommend reading through it (it talks as much about
@@ -22,21 +22,9 @@ handle concurrency:
 2. Using combinators.
 3. Stackless coroutines, better known as generators.
 
-### Stackful coroutines/green threads
-
-I've written about green threads before. Go check out 
-[Green Threads Explained in 200 lines of Rust][greenthreads] if you're interested.
-
-Green threads uses the same mechanism as an OS does by creating a thread for
-each task, setting up a stack, save the CPU's state and jump from one
-task(thread) to another by doing a "context switch".
-
-We yield control to the scheduler (which is a central part of the runtime in
-such a system) which then continues running a different task.
-
-Rust had green threads once, but they were removed before it hit 1.0. The state
-of execution is stored in each stack so in such a solution there would be no need
-for `async`, `await`, `Futures` or `Pin`. All this would be implementation details for the library.
+We covered [green threads in the background information](0_background_information.md#green-threads)
+so we won't repeat that here. We'll concentrate on the variants of stackless
+coroutines which Rust uses today.
 
 ### Combinators
 
@@ -93,10 +81,14 @@ async fn myfn() {
 }
 ```
 
-Generators in Rust are implemented as state machines. The memory footprint of a
-chain of computations is only defined by the largest footprint of any single
-step require. That means that adding steps to a chain of computations might not
-require any increased memory at all.
+Async in Rust is implemented using Generators. So to understand how Async really
+works we need to understand generators first. Generators in Rust are implemented
+as state machines. The memory footprint of a chain of computations is only
+defined by the largest footprint of what the largest step require. 
+
+That means that adding steps to a chain of computations might not require any
+increased memory at all and it's one of the reasons why Futures and Async in
+Rust has very little overhead.
 
 ## How generators work
 
@@ -104,7 +96,6 @@ In Nightly Rust today you can use the `yield` keyword. Basically using this
 keyword in a closure, converts it to a generator. A closure could look like this
 before we had a concept of `Pin`:
 
-
 ```rust,noplaypen,ignore
 #![feature(generators, generator_trait)]
 use std::ops::{Generator, GeneratorState};
@@ -176,19 +167,17 @@ impl Generator for GeneratorA {
         match std::mem::replace(&mut *self, GeneratorA::Exit) {
             GeneratorA::Enter(a1) => {
 
-          /*|---code before yield---|*/
-          /*|*/ println!("Hello"); /*|*/ 
-          /*|*/ let a = a1 * 2;    /*|*/
-          /*|------------------------|*/
+          /*----code before yield----*/
+                println!("Hello");
+                let a = a1 * 2;
 
                 *self = GeneratorA::Yield1(a);
                 GeneratorState::Yielded(a)
             }
-            GeneratorA::Yield1(_) => {
 
-          /*|----code after yield----|*/
-          /*|*/ println!("world!"); /*|*/ 
-          /*|-------------------------|*/
+            GeneratorA::Yield1(_) => {
+          /*-----code after yield-----*/
+                println!("world!");
 
                 *self = GeneratorA::Exit;
                 GeneratorState::Complete(())
@@ -218,7 +207,7 @@ Instead of discussing it in theory, let's look at some code.
 > in depth explanation see [Tyler Mandry's excellent article: How Rust optimizes async/await][optimizing-await]
 
 ```rust,noplaypen,ignore
-let mut gen = move || {
+let mut generator = move || {
         let to_borrow = String::from("Hello");
         let borrowed = &to_borrow;
         yield borrowed.len();
@@ -226,15 +215,28 @@ let mut gen = move || {
     };
 ```
 
+We'll be hand-coding some versions of a state-machines representing a state
+machine for the generator defined aboce.
+
+We step through each step "manually" in every example, so it looks pretty
+unfamiliar. We could add some syntactic sugar like implementing the `Iterator`
+trait for our generators which would let us do this:
+
+```rust, ingore
+for val in generator {
+    println!("{}", val);
+}
+```
+
+It's a pretty trivial change to make, but this chapter is already getting long.
+Just keep this in the back of your head as we move forward.
+
 Now what does our rewritten state machine look like with this example?
 
 ```rust,compile_fail
-# // If you've ever wondered why the parameters are called Y and R the naming from
-# // the original rfc most likely holds the answer
 # enum GeneratorState<Y, R> {
-#     // originally called `CoResult`
-#     Yielded(Y),  // originally called `Yield(Y)`
-#     Complete(R), // originally called `Return(R)`
+#     Yielded(Y), 
+#     Complete(R),
 # }
 # 
 # trait Generator {
@@ -266,7 +268,7 @@ impl Generator for GeneratorA {
         match std::mem::replace(&mut *self, GeneratorA::Exit) {
             GeneratorA::Enter => {
                 let to_borrow = String::from("Hello");
-                let borrowed = &to_borrow;
+                let borrowed = &to_borrow; // <--- NB!
                 let res = borrowed.len();
 
                 *self = GeneratorA::Yield1 {to_borrow, borrowed};
@@ -298,31 +300,10 @@ into itself.
 
 As you'll notice, this compiles just fine!
 
-```rust,editable
-pub fn main() {
-    let mut gen = GeneratorA::start();
-    let mut gen2 = GeneratorA::start();
-
-    if let GeneratorState::Yielded(n) = gen.resume() {
-        println!("Got value {}", n);
-    }
-    
-    // If you uncomment this, very bad things can happen. This is why we need `Pin`
-    // std::mem::swap(&mut gen, &mut gen2);
-
-    if let GeneratorState::Yielded(n) = gen2.resume() {
-        println!("Got value {}", n);
-    }
-
-    // if you uncomment `mem::swap`.. this should now start gen2.
-    if let GeneratorState::Complete(()) = gen.resume() {
-        ()
-    };
-}
-
+```rust, ignore
 enum GeneratorState<Y, R> {
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
+    Yielded(Y),  
+    Complete(R), 
 }
 
 trait Generator {
@@ -335,7 +316,7 @@ enum GeneratorA {
     Enter,
     Yield1 {
         to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
+        borrowed: *const String,
     },
     Exit,
 }
@@ -349,20 +330,18 @@ impl Generator for GeneratorA {
     type Yield = usize;
     type Return = ();
     fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {
-        // lets us get ownership over current state
             match self {
             GeneratorA::Enter => {
                 let to_borrow = String::from("Hello");
                 let borrowed = &to_borrow;
                 let res = borrowed.len();
-
-                // Trick to actually get a self reference
                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match self {
-                 GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow,
-                 _ => unreachable!(),  
-                };
-
+                
+                // We set the self-reference here
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+               
                 GeneratorState::Yielded(res)
             }
 
@@ -378,139 +357,186 @@ impl Generator for GeneratorA {
 }
 ```
 
-> Try to uncomment the line with `mem::swap` and see the results.
+Remember that our example is the generator we crated which looked like this:
 
-While the example above compiles just fine, we expose consumers of this this API 
-to both possible undefined behavior and other memory errors while using just safe
-Rust. This is a big problem!
-
-But now, let's prevent this problem using `Pin`. We'll discuss
-`Pin` more in the next chapter, but you'll get an introduction here by just
-reading the comments.
-
-```rust,editable
-#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
-use std::pin::Pin;
-
-pub fn main() {
-    let gen1 = GeneratorA::start();
-    let gen2 = GeneratorA::start();
-    // Before we pin the pointers, this is safe to do
-    // std::mem::swap(&mut gen, &mut gen2);
-
-    // constructing a `Pin::new()` on a type which does not implement `Unpin` is unsafe.
-    // However, as you'll see in the start of the next chapter value pinned to
-    // heap can be constructed while staying in safe Rust so we can use
-    // that to avoid unsafe. You can also use crates like `pin_utils` to do 
-    // this safely, just remember that they use unsafe under the hood so it's 
-    // like using an already-reviewed unsafe implementation.
-
-    let mut pinned1 = Box::pin(gen1);
-    let mut pinned2 = Box::pin(gen2);
-    // Uncomment these if you think it's safe to pin the values to the stack instead 
-    // (it is in this case). Remember to comment out the two previous lines first.
-    //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) };
-    //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) };
-
-    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
-        println!("Gen1 got value {}", n);
-    }
-    
-    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
-        println!("Gen2 got value {}", n);
+```rust,noplaypen,ignore
+let mut gen = move || {
+        let to_borrow = String::from("Hello");
+        let borrowed = &to_borrow;
+        yield borrowed.len();
+        println!("{} world!", borrowed);
     };
-
-    // This won't work
-    // std::mem::swap(&mut gen, &mut gen2);
-    // This will work but will just swap the pointers. Nothing inherently bad happens here.
-    // std::mem::swap(&mut pinned1, &mut pinned2);
-
-    let _ = pinned1.as_mut().resume();
-    let _ = pinned2.as_mut().resume();
-}
-
-enum GeneratorState<Y, R> {
-    // originally called `CoResult`
-    Yielded(Y),  // originally called `Yield(Y)`
-    Complete(R), // originally called `Return(R)`
-}
-
-trait Generator {
-    type Yield;
-    type Return;
-    fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;
-}
-
-enum GeneratorA {
-    Enter,
-    Yield1 {
-        to_borrow: String,
-        borrowed: *const String, // Normally you'll see `std::ptr::NonNull` used instead of *ptr
-    },
-    Exit,
-}
-
-impl GeneratorA {
-    fn start() -> Self {
-        GeneratorA::Enter
-    }
-}
-
-// This tells us that the underlying pointer is not safe to move after pinning. In this case,
-// only we as implementors "feel" this, however, if someone is relying on our Pinned pointer
-// this will prevent them from moving it. You need to enable the feature flag 
-// `#![feature(optin_builtin_traits)]` and use the nightly compiler to implement `!Unpin`.
-// Normally, you would use `std::marker::PhantomPinned` to indicate that the
-// struct is `!Unpin`.
-impl !Unpin for GeneratorA { }
-
-impl Generator for GeneratorA {
-    type Yield = usize;
-    type Return = ();
-    fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
-        // lets us get ownership over current state
-        let this = unsafe { self.get_unchecked_mut() };
-            match this {
-            GeneratorA::Enter => {
-                let to_borrow = String::from("Hello");
-                let borrowed = &to_borrow;
-                let res = borrowed.len();
-
-                // Trick to actually get a self reference. We can't reference
-                // the `String` earlier since these references will point to the
-                // location in this stack frame which will not be valid anymore
-                // when this function returns.
-                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
-                match this {
-                 GeneratorA::Yield1{to_borrow, borrowed} => *borrowed = to_borrow,
-                 _ => unreachable!(),  
-                };
-
-                GeneratorState::Yielded(res)
-            }
-
-            GeneratorA::Yield1 {borrowed, ..} => {
-                let borrowed: &String = unsafe {&**borrowed};
-                println!("{} world", borrowed);
-                *this = GeneratorA::Exit;
-                GeneratorState::Complete(())
-            }
-            GeneratorA::Exit => panic!("Can't advance an exited generator!"),
-        }
-    }
-}
 ```
 
-Now, as you see, the consumer of this API must either:
+Below is an example of how we could run this state-machine. But there is still
+one huge problem with this:
+
+```rust
+pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
+
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!("Got value {}", n);
+    }
+
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!("Got value {}", n);
+    }
+
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
+}
+# enum GeneratorState<Y, R> {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -> Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {
+#             match self {
+#             GeneratorA::Enter => {
+#                 let to_borrow = String::from("Hello");
+#                 let borrowed = &to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} => {
+#                 let borrowed: &String = unsafe {&**borrowed};
+#                 println!("{} world", borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit => panic!("Can't advance an exited generator!"),
+#         }
+#     }
+# }
+```
+
+The problem however is that in safe Rust we can still do this:
+
+_Run the code and compare the results. Do you see the problem?_
+```rust
+pub fn main() {
+    let mut gen = GeneratorA::start();
+    let mut gen2 = GeneratorA::start();
+
+    if let GeneratorState::Yielded(n) = gen.resume() {
+        println!("Got value {}", n);
+    }
+
+    std::mem::swap(&mut gen, &mut gen2); // <--- Big problem!
+
+    if let GeneratorState::Yielded(n) = gen2.resume() {
+        println!("Got value {}", n);
+    }
+
+    // This would now start gen2 since we swapped them.
+    if let GeneratorState::Complete(()) = gen.resume() {
+        ()
+    };
+}
+# enum GeneratorState<Y, R> {
+#     Yielded(Y),  
+#     Complete(R), 
+# }
+# 
+# trait Generator {
+#     type Yield;
+#     type Return;
+#     fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return>;
+# }
+# 
+# enum GeneratorA {
+#     Enter,
+#     Yield1 {
+#         to_borrow: String,
+#         borrowed: *const String,
+#     },
+#     Exit,
+# }
+# 
+# impl GeneratorA {
+#     fn start() -> Self {
+#         GeneratorA::Enter
+#     }
+# }
+# impl Generator for GeneratorA {
+#     type Yield = usize;
+#     type Return = ();
+#     fn resume(&mut self) -> GeneratorState<Self::Yield, Self::Return> {
+#             match self {
+#             GeneratorA::Enter => {
+#                 let to_borrow = String::from("Hello");
+#                 let borrowed = &to_borrow;
+#                 let res = borrowed.len();
+#                 *self = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+#                 
+#                 // We set the self-reference here
+#                 if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+#                     *borrowed = to_borrow;
+#                 }
+#                
+#                 GeneratorState::Yielded(res)
+#             }
+# 
+#             GeneratorA::Yield1 {borrowed, ..} => {
+#                 let borrowed: &String = unsafe {&**borrowed};
+#                 println!("{} world", borrowed);
+#                 *self = GeneratorA::Exit;
+#                 GeneratorState::Complete(())
+#             }
+#             GeneratorA::Exit => panic!("Can't advance an exited generator!"),
+#         }
+#     }
+# }
+```
+
+Wait? What happened to "Hello"?
+
+Turns out that while the example above compiles
+just fine, we expose consumers of this this API to both possible undefined
+behavior and other memory errors while using just safe Rust. This is a big
+problem!
+
+We'll explain exactly what happened using a slightly simpler example in the next
+chapter and we'll fix our generator using `Pin` so join me as we explore
+the last topic before we implement our main Futures example.
+
+
 
-1. Box the value and thereby allocating it on the heap
-2. Use `unsafe` and pin the value to the stack. The user knows that if they move
-the value afterwards it will violate the guarantee they promise to uphold when
-they did their unsafe implementation.
 
-Hopefully, after this you'll have an idea of what happens when you use the
-`yield` or `await` keywords inside an async function, and why we need `Pin` if
-we want to be able to safely borrow across `yield/await` points.
 
 ## Bonus section - self referential generators in Rust today
 
diff --git a/src/4_pin.md b/src/4_pin.md
index 0d0b49b..5921c43 100644
--- a/src/4_pin.md
+++ b/src/4_pin.md
@@ -1,98 +1,63 @@
 # Pin
 
-> **Relevant for**
+> **Overview**
 >
-> 1. Understanding `Generators` and `Futures`
-> 2. Knowing how to use `Pin` is required when implementing your own `Future`
-> 3. Understanding how to make self-referential types safe to use in Rust
-> 4. Learning how borrowing across `await` points is accomplished
+> 1. Learn how to use `Pin` and why it's required when implementing your own `Future`
+> 2. Understand how to make self-referential types safe to use in Rust
+> 3. Learn how borrowing across `await` points is accomplished
+> 4. Get a set of practical rules to help you work with `Pin`
 >
 > `Pin` was suggested in [RFC#2349][rfc2349]
 
-We already got a brief introduction of `Pin` in the previous chapters, so we'll
-start off without any further introduction.
-
-Let's jump strait to some definitions and then create 10 rules to remember when
-we work with `Pin`.
+Let's jump strait to it. Pinning is one of those subjects which is hard to wrap
+your head around in the start, but once you unlock a mental model for it
+it gets significantly easier to reason about.
 
 ## Definitions
 
+Pin is only relevant for pointers. A reference to an object is a pointer.
+
 Pin consists of the `Pin` type and the `Unpin` marker. Pin's purpose in life is
 to govern the rules that need to apply for types which implement `!Unpin`.
 
-Pin is only relevant for pointers. A reference to an object is a pointer.
-
 Yep, you're right, that's double negation right there. `!Unpin` means
 "not-un-pin".
 
-_This naming scheme is Rust deliberately testing if you're too tired to safely implement a type with this marker. If you're starting to get confused by
-`!Unpin` it's a good sign that it's time to lay down the work and start over
-tomorrow with a fresh mind._
+> _This naming scheme is one of Rusts safety features where it deliberately
+> tests if you're too tired to safely implement a type with this marker. If
+> you're starting to get confused, or even angry, by `!Unpin` it's a good sign
+> that it's time to lay down the work and start over tomorrow with a fresh mind._
 
-> On a more serious note, I feel obliged to mention that there are valid reasons for the names
-> that were chosen. If you want to you can read a bit of the discussion from the
-> [internals thread][internals_unpin]. One of the best takeaways from there in my eyes
-> is this quote from `tmandry`:
->
-> _Think of taking a thumbtack out of a cork board so you can tweak how a flyer looks. For Unpin types, this unpinning is directly supported by the type; you can do this implicitly. You can even swap out the object with another before you put the pin back. For other types, you must be much more careful._
+On a more serious note, I feel obliged to mention that there are valid reasons
+for the names that were chosen. Naming is not easy, and I considered renaming
+`Unpin` and `!Unpin` in this book to make them easier to reason about. 
 
+However, an experienced member of the Rust community convinced me that that there
+is just too many nuances and edge-cases to consider which is easily overlooked when
+naively giving these markers different names, and I'm convinced that we'll
+just have to get used to them and use them as is.
 
-For the next paragraph we'll rename these markers to:
+If you want to you can read a bit of the discussion from the
+[internals thread][internals_unpin]. One of the best takeaways from there in my
+eyes is this quote from `tmandry`:
 
-> `!Unpin` = `MustStay` and `Unpin` = `CanMove`
+>_Think of taking a thumbtack out of a cork board so you can tweak how a flyer
+looks. For Unpin types, this unpinning is directly supported by the type; you
+can do this implicitly. You can even swap out the object with another before you
+put the pin back. For other types, you must be much more careful._
 
-It just makes it much easier to talk about them.
+## Pinning and self-referential structs
 
-## Rules to remember
+Let's start where we left off in the last chapter by making the problem we
+saw using a self-referential struct in our generator a lot simpler by making
+some self-referential structs that are easier to reason about than our
+state machines:
 
-1. If `T: CanMove` (which is the default), then `Pin<'a, T>` is entirely equivalent to `&'a mut T`. in other words: `CanMove` means it's OK for this type to be moved even when pinned, so `Pin` will have no effect on such a type.
+For now our example will look like this:
 
-2. Getting a `&mut T` to a pinned pointer requires unsafe if `T: MustStay`. In other words: requiring a pinned pointer to a type which is `MustStay` prevents the _user_ of that API from moving that value unless it choses to write `unsafe` code.
-
-3. Pinning does nothing special with memory allocation like putting it into some "read only" memory or anything fancy. It only tells the compiler that some operations on this value should be forbidden.
-
-4. Most standard library types implement `CanMove`. The same goes for most
-"normal" types you encounter in Rust. `Futures` and `Generators` are two
-exceptions.
-
-5. The main use case for `Pin` is to allow self referential types, the whole
-justification for stabilizing them was to allow that. There are still corner
-cases in the API which are being explored.
-
-6. The implementation behind objects that are `MustStay` is most likely unsafe.
-Moving such a type can cause the universe to crash. As of the time of writing
-this book, creating and reading fields of a self referential struct still requires `unsafe`.
-
-7. You can add a `MustStay` bound on a type on nightly with a feature flag, or
-by adding `std::marker::PhantomPinned` to your type on stable.
-
-8. You can either pin a value to memory on the stack or on the heap.
-
-9. Pinning a `MustStay` pointer to the stack requires `unsafe`
-
-10. Pinning a `MustStay` pointer to the heap does not require `unsafe`. There is a shortcut for doing this using `Box::pin`.
-
-> Unsafe code does not mean it's literally "unsafe", it only relieves the 
-> guarantees you normally get from the compiler. An `unsafe` implementation can 
-> be perfectly safe to do, but you have no safety net.
-
-Let's take a look at an example:
-
-```rust,editable
+```rust, ignore
 use std::pin::Pin;
 
-fn main() {
-    let mut test1 = Test::new("test1");
-    test1.init();
-    let mut test2 = Test::new("test2");
-    test2.init();
-
-    println!("a: {}, b: {}", test1.a(), test1.b());
-    std::mem::swap(&mut test1, &mut test2); // try commenting out this line
-    println!("a: {}, b: {}", test2.a(), test2.b());
-
-}
-
 #[derive(Debug)]
 struct Test {
     a: String,
@@ -107,7 +72,7 @@ impl Test {
             b: std::ptr::null(),
         }
     }
-    
+
     fn init(&mut self) {
         let self_ref: *const String = &self.a;
         self.b = self_ref;
@@ -133,26 +98,177 @@ possible.
 `a` and `b`. Since `b` is a reference to `a` we store it as a pointer since
 the borrowing rules of Rust doesn't allow us to define this lifetime.
 
+Now, let's use this example to explain the problem we encounter in detail. As
+you see, this works as expected:
+
+```rust
+fn main() {
+    let mut test1 = Test::new("test1");
+    test1.init();
+    let mut test2 = Test::new("test2");
+    test2.init();
+
+    println!("a: {}, b: {}", test1.a(), test1.b());
+    println!("a: {}, b: {}", test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &str) -> Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     // We need an `init` method to actually set our self-reference
+#     fn init(&mut self) {
+#         let self_ref: *const String = &self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&self) -> &str {
+#         &self.a
+#     } 
+#     
+#     fn b(&self) -> &String {
+#         unsafe {&*(self.b)}
+#     }
+# }
+```
+
 In our main method we first instantiate two instances of `Test` and print out
-the value of the fields on `test1`. We get:
+the value of the fields on `test1`. We get what we'd expect:
 
 ```rust, ignore
 a: test1, b: test1
+a: test2, b: test2
 ```
 
+Let's see what happens if we swap the data stored at the memory location
+which `test1` is pointing to with the data stored at the memory location
+`test2` is pointing to and vice a versa.
 
-Next we swap the data stored at the memory location which `test1` is pointing to
-with the data stored at the memory location `test2` is pointing to and vice a versa.
+```rust
+fn main() {
+    let mut test1 = Test::new("test1");
+    test1.init();
+    let mut test2 = Test::new("test2");
+    test2.init();
 
-We should expect that printing the fields of `test2` should display the same as
-`test1` (since the object we printed before the swap has moved there now).
+    println!("a: {}, b: {}", test1.a(), test1.b());
+    std::mem::swap(&mut test1, &mut test2);
+    println!("a: {}, b: {}", test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &str) -> Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&mut self) {
+#         let self_ref: *const String = &self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&self) -> &str {
+#         &self.a
+#     } 
+#     
+#     fn b(&self) -> &String {
+#         unsafe {&*(self.b)}
+#     }
+# }
+```
+
+Naively, we could think that what we should get a debug print of `test1` two
+times like this
 
 ```rust, ignore
+a: test1, b: test1
+a: test1, b: test1
+```
+
+But instead we get:
+
+```rust, ignore
+a: test1, b: test1
 a: test1, b: test2
 ```
-The pointer to `b` still points to the old location. That location is now
-occupied with the string "test2". This can be a bit hard to visualize so I made
-a figure that i hope can help.
+
+The pointer to `test2.b` still points to the old location which is inside `test1`
+now. The struct is not self-referential anymore, it holds a pointer to a field
+in a different object. That means we can't rely on the lifetime of `test2.b` to
+be tied to the lifetime of `test2` anymore.
+
+If your still not convinced, this should at least convince you:
+
+```rust
+fn main() {
+    let mut test1 = Test::new("test1");
+    test1.init();
+    let mut test2 = Test::new("test2");
+    test2.init();
+
+    println!("a: {}, b: {}", test1.a(), test1.b());
+    std::mem::swap(&mut test1, &mut test2);
+    test1.a = "I've totally changed now!".to_string();
+    println!("a: {}, b: {}", test2.a(), test2.b());
+
+}
+# use std::pin::Pin;
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+# }
+# 
+# impl Test {
+#     fn new(txt: &str) -> Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#         }
+#     }
+# 
+#     fn init(&mut self) {
+#         let self_ref: *const String = &self.a;
+#         self.b = self_ref;
+#     }
+#     
+#     fn a(&self) -> &str {
+#         &self.a
+#     } 
+#     
+#     fn b(&self) -> &String {
+#         unsafe {&*(self.b)}
+#     }
+# }
+```
+
+That shouldn't happen. There is no serious error yet, but as you can imagine
+it's easy to create serious bugs using this code.
+
+I created a diagram to help visualize what's going on:
 
 **Fig 1: Before and after swap**
 ![swap_problem](./assets/swap_problem.jpg)
@@ -160,9 +276,12 @@ a figure that i hope can help.
 As you can see this results in unwanted behavior. It's easy to get this to 
 segfault, show UB and fail in other spectacular ways as well.
 
-If we change the example to using `Pin` instead:
+## Pinning to the stack
 
-```rust,editable
+Now, we can solve this problem by using `Pin` instead. Let's take a look at what
+our example would look like then:
+
+```rust, ignore
 use std::pin::Pin;
 use std::marker::PhantomPinned;
 
@@ -197,7 +316,18 @@ impl Test {
         unsafe { &*(self.b) }
     }
 }
+```
 
+Now, what we've done here is pinning a stack address. That will always be
+`unsafe` if our type implements `!Unpin`.
+
+We use the same tricks here, including requiring an `init`. If we want to fix that
+and let users avoid `unsafe` we need to pin our data on the heap instead which
+we'll show in a second.
+
+Let's see what happens if we run our example now:
+
+```rust
 pub fn main() {
     let mut test1 = Test::new("test1");
     test1.init();
@@ -206,36 +336,108 @@ pub fn main() {
     test2.init();
     let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) };
 
-    println!(
-        "a: {}, b: {}",
-        Test::a(test1_pin.as_ref()),
-        Test::b(test1_pin.as_ref())
-    );
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
-    println!(
-        "a: {}, b: {}",
-        Test::a(test2_pin.as_ref()),
-        Test::b(test2_pin.as_ref())
-    );
+    println!("a: {}, b: {}", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    println!("a: {}, b: {}", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
 }
-
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &str) -> Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&mut self) {
+#         let self_ptr: *const String = &self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a<'a>(self: Pin<&'a Self>) -> &'a str {
+#         &self.get_ref().a
+#     }
+# 
+#     fn b<'a>(self: Pin<&'a Self>) -> &'a String {
+#         unsafe { &*(self.b) }
+#     }
+# }
 ```
 
-Now, what we've done here is pinning a stack address. That will always be
-`unsafe` if our type implements `!Unpin` (aka `MustStay`).
+Now, if we try to pull the same trick which got us in to trouble the last time
+you'll get a compilation error. So t
 
-We use some tricks here, including requiring an `init`. If we want to fix that
-and let users avoid `unsafe` we need to pin our data on the heap instead.
+```rust, compile_fail
+pub fn main() {
+    let mut test1 = Test::new("test1");
+    test1.init();
+    let mut test1_pin = unsafe { Pin::new_unchecked(&mut test1) }; 
+    let mut test2 = Test::new("test2");
+    test2.init();
+    let mut test2_pin = unsafe { Pin::new_unchecked(&mut test2) };
 
-> Stack pinning will always depend on the current stack frame we're in, so we
-can't create a self referential object in one stack frame and return it since
-any pointers we take to "self" is invalidated.
+    println!("a: {}, b: {}", Test::a(test1_pin.as_ref()), Test::b(test1_pin.as_ref()));
+    std::mem::swap(test1_pin.as_mut(), test2_pin.as_mut());
+    println!("a: {}, b: {}", Test::a(test2_pin.as_ref()), Test::b(test2_pin.as_ref()));
+}
+# use std::pin::Pin;
+# use std::marker::PhantomPinned;
+# 
+# #[derive(Debug)]
+# struct Test {
+#     a: String,
+#     b: *const String,
+#     _marker: PhantomPinned,
+# }
+# 
+# 
+# impl Test {
+#     fn new(txt: &str) -> Self {
+#         let a = String::from(txt);
+#         Test {
+#             a,
+#             b: std::ptr::null(),
+#             // This makes our type `!Unpin`
+#             _marker: PhantomPinned,
+#         }
+#     }
+#     fn init(&mut self) {
+#         let self_ptr: *const String = &self.a;
+#         self.b = self_ptr;
+#     }
+# 
+#     fn a<'a>(self: Pin<&'a Self>) -> &'a str {
+#         &self.get_ref().a
+#     }
+# 
+#     fn b<'a>(self: Pin<&'a Self>) -> &'a String {
+#         unsafe { &*(self.b) }
+#     }
+# }
+```
 
-The next example solves some of our friction at the cost of a heap allocation.
+> It's important to note that stack pinning will always depend on the current
+> stack frame we're in, so we can't create a self referential object in one
+> stack frame and return it since any pointers we take to "self" is invalidated.
 
-```rust, editbable
+## Pinning to the heap
+
+For completeness let's remove some unsafe and the need for an `init` method
+at the cost of a heap allocation. Pinning to the heap is safe so the user
+doesn't need to implement any unsafe code:
+
+```rust
 use std::pin::Pin;
 use std::marker::PhantomPinned;
 
@@ -275,9 +477,6 @@ pub fn main() {
     let mut test2 = Test::new("test2");
 
     println!("a: {}, b: {}",test1.as_ref().a(), test1.as_ref().b());
-
-    // Try to uncomment this and see what happens
-    // std::mem::swap(&mut test1, &mut test2);
     println!("a: {}, b: {}",test2.as_ref().a(), test2.as_ref().b());
 }
 ```
@@ -291,6 +490,47 @@ that the self-referential pointer stays valid.
 There are ways to safely give some guarantees on stack pinning as well, but right
 now you need to use a crate like [pin_project][pin_project] to do that.
 
+## Practical rules for Pinning
+
+1. If `T: Unpin` (which is the default), then `Pin<'a, T>` is entirely
+equivalent to `&'a mut T`. in other words: `Unpin` means it's OK for this type
+to be moved even when pinned, so `Pin` will have no effect on such a type.
+
+2. Getting a `&mut T` to a pinned pointer requires unsafe if `T: !Unpin`. In
+other words: requiring a pinned pointer to a type which is `!Unpin` prevents
+the _user_ of that API from moving that value unless it choses to write `unsafe`
+code.
+
+3. Pinning does nothing special with memory allocation like putting it into some
+"read only" memory or anything fancy. It only tells the compiler that some
+operations on this value should be forbidden.
+
+4. Most standard library types implement `Unpin`. The same goes for most
+"normal" types you encounter in Rust. `Futures` and `Generators` are two
+exceptions.
+
+5. The main use case for `Pin` is to allow self referential types, the whole
+justification for stabilizing them was to allow that. There are still corner
+cases in the API which are being explored.
+
+6. The implementation behind objects that are `!Unpin` is most likely unsafe.
+Moving such a type can cause the universe to crash. As of the time of writing
+this book, creating and reading fields of a self referential struct still requires `unsafe`.
+
+7. You can add a `!Unpin` bound on a type on nightly with a feature flag, or
+by adding `std::marker::PhantomPinned` to your type on stable.
+
+8. You can either pin a value to memory on the stack or on the heap.
+
+9. Pinning a `!Unpin` pointer to the stack requires `unsafe`
+
+10. Pinning a `!Unpin` pointer to the heap does not require `unsafe`. There is a shortcut for doing this using `Box::pin`.
+
+> Unsafe code does not mean it's literally "unsafe", it only relieves the 
+> guarantees you normally get from the compiler. An `unsafe` implementation can 
+> be perfectly safe to do, but you have no safety net.
+
+
 ### Projection/structural pinning
 
 In short, projection is a programming language term. `mystruct.field1` is a
@@ -311,4 +551,133 @@ we're soon finished.
 
 [rfc2349]: https://github.com/rust-lang/rfcs/blob/master/text/2349-pin.md
 [pin_project]: https://docs.rs/pin-project/
-[internals_unpin]: https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12
\ No newline at end of file
+[internals_unpin]: https://internals.rust-lang.org/t/naming-pin-anchor-move/6864/12
+
+## Bonus section: Fixing our self-referential generator and learning more about Pin
+
+But now, let's prevent this problem using `Pin`. We'll discuss
+`Pin` more in the next chapter, but you'll get an introduction here by just
+reading the comments.
+
+```rust
+#![feature(optin_builtin_traits)] // needed to implement `!Unpin`
+use std::pin::Pin;
+
+pub fn main() {
+    let gen1 = GeneratorA::start();
+    let gen2 = GeneratorA::start();
+    // Before we pin the pointers, this is safe to do
+    // std::mem::swap(&mut gen, &mut gen2);
+
+    // constructing a `Pin::new()` on a type which does not implement `Unpin` is
+    // unsafe. A value pinned to heap can be constructed while staying in safe
+    // Rust so we can use that to avoid unsafe. You can also use crates like
+    // `pin_utils` to pin to the stack safely, just remember that they use
+    // unsafe under the hood so it's like using an already-reviewed unsafe
+    // implementation.
+
+    let mut pinned1 = Box::pin(gen1);
+    let mut pinned2 = Box::pin(gen2);
+
+    // Uncomment these if you think it's safe to pin the values to the stack instead 
+    // (it is in this case). Remember to comment out the two previous lines first.
+    //let mut pinned1 = unsafe { Pin::new_unchecked(&mut gen1) };
+    //let mut pinned2 = unsafe { Pin::new_unchecked(&mut gen2) };
+
+    if let GeneratorState::Yielded(n) = pinned1.as_mut().resume() {
+        println!("Gen1 got value {}", n);
+    }
+    
+    if let GeneratorState::Yielded(n) = pinned2.as_mut().resume() {
+        println!("Gen2 got value {}", n);
+    };
+
+    // This won't work:
+    // std::mem::swap(&mut gen, &mut gen2);
+    // This will work but will just swap the pointers so nothing bad happens here:
+    // std::mem::swap(&mut pinned1, &mut pinned2);
+
+    let _ = pinned1.as_mut().resume();
+    let _ = pinned2.as_mut().resume();
+}
+
+enum GeneratorState<Y, R> {
+    Yielded(Y),  
+    Complete(R), 
+}
+
+trait Generator {
+    type Yield;
+    type Return;
+    fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return>;
+}
+
+enum GeneratorA {
+    Enter,
+    Yield1 {
+        to_borrow: String,
+        borrowed: *const String,
+    },
+    Exit,
+}
+
+impl GeneratorA {
+    fn start() -> Self {
+        GeneratorA::Enter
+    }
+}
+
+// This tells us that the underlying pointer is not safe to move after pinning.
+// In this case, only we as implementors "feel" this, however, if someone is
+// relying on our Pinned pointer this will prevent them from moving it. You need
+// to enable the feature flag `#![feature(optin_builtin_traits)]` and use the
+// nightly compiler to implement `!Unpin`. Normally, you would use
+// `std::marker::PhantomPinned` to indicate that the struct is `!Unpin`.
+impl !Unpin for GeneratorA { }
+
+impl Generator for GeneratorA {
+    type Yield = usize;
+    type Return = ();
+    fn resume(self: Pin<&mut Self>) -> GeneratorState<Self::Yield, Self::Return> {
+        // lets us get ownership over current state
+        let this = unsafe { self.get_unchecked_mut() };
+            match this {
+            GeneratorA::Enter => {
+                let to_borrow = String::from("Hello");
+                let borrowed = &to_borrow;
+                let res = borrowed.len();
+                *this = GeneratorA::Yield1 {to_borrow, borrowed: std::ptr::null()};
+
+                // Trick to actually get a self reference. We can't reference
+                // the `String` earlier since these references will point to the
+                // location in this stack frame which will not be valid anymore
+                // when this function returns.
+                if let GeneratorA::Yield1 {to_borrow, borrowed} = self {
+                    *borrowed = to_borrow;
+                }
+
+                GeneratorState::Yielded(res)
+            }
+
+            GeneratorA::Yield1 {borrowed, ..} => {
+                let borrowed: &String = unsafe {&**borrowed};
+                println!("{} world", borrowed);
+                *this = GeneratorA::Exit;
+                GeneratorState::Complete(())
+            }
+            GeneratorA::Exit => panic!("Can't advance an exited generator!"),
+        }
+    }
+}
+```
+
+Now, as you see, the consumer of this API must either:
+
+1. Box the value and thereby allocating it on the heap
+2. Use `unsafe` and pin the value to the stack. The user knows that if they move
+the value afterwards it will violate the guarantee they promise to uphold when
+they did their unsafe implementation.
+
+Hopefully, after this you'll have an idea of what happens when you use the
+`yield` or `await` keywords inside an async function, and why we need `Pin` if
+we want to be able to safely borrow across `yield/await` points.
\ No newline at end of file
diff --git a/theme/highlight.css b/theme/highlight.css
index 21964e5..c54bcb1 100644
--- a/theme/highlight.css
+++ b/theme/highlight.css
@@ -4,7 +4,7 @@
 
 /* Atelier-Dune Comment */
 .hljs-comment {
-  color:  rgb(255, 115, 0);;
+  color:  rgba(34, 0, 155, 0.5);;
   font-style: italic;
 }
 .hljs-quote {