diff --git a/book/0_0_introduction.html b/book/0_0_introduction.html index d2c374a..d6c04fc 100644 --- a/book/0_0_introduction.html +++ b/book/0_0_introduction.html @@ -1,5 +1,5 @@ - + @@ -32,11 +32,11 @@ - + @@ -60,11 +60,8 @@ var theme; try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } if (theme === null || theme === undefined) { theme = default_theme; } - var html = document.querySelector('html'); - html.classList.remove('no-js') - html.classList.remove('light') - html.classList.add(theme); - html.classList.add('js'); + document.body.className = theme; + document.querySelector('html').className = theme + ' js'; @@ -80,8 +77,8 @@ @@ -148,7 +145,77 @@
-

Introduction

+

Futures Explained in 200 Lines of Rust

+

This book aims to explain Futures in Rust using an example driven approach.

+

The goal is to get a better understanding of Futures by implementing a toy +Reactor, a very simple Executor and our own Futures.

+

We'll start off solving a small problem without Futures, Wakers or async/await +and then gradually adapt our example so it implements all these concepts, and +can be solved using the executor provided by both tokio and async_str.

+

In the end I've made some reader excercises you can do if you want to fix some +of the most glaring ommissions and shortcuts we took and create a slightly better +example yourself.

+

What does this book give you that isn't covered elsewhere?

+

That's a valid question. There are many good resources and examples already. First +of all, this book will point you to some background information that I have found +very valuable to get an understanding of concurrent programming in general.

+

I find that many discussions arise, not because Futures is a hard concept to +grasp, but that concurrent programming is a hard concept in general.

+

Secondly, I've always found small runnable examples very exiting to learn from. It's +all code that you can download, play with and learn from.

+

What we'll do and not

+

We'll:

+ +

We'll not:

+ +

I do want to explore Rusts internal implementation but that will be for a later +book.

+

Credits and thanks

+

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. Reading and exploring some of this code is nothing less than +impressive.

+

Why is Futures in Rust hard to understand

+

Well, I think it has to do with several things:

+
    +
  1. +

    Futures has a very interesting implementation, compiling down to a state +machine using generators to suspend and resume execution. In a language such as +Rust this is pretty hard to do ergonomically and safely. You are exposed to some +if this complexity when working with futures and want to understand them, not +only learn how to use them.

    +
    2. +
  2. +

    Rust doesn't provide a runtime. That means you'll actually have to choose one +yourself and actually know what a Reactor and an Executor is. While not +too difficult, you need to make more choices than you need in GO and other +languages designed with a concurrent programming in mind and ships with a +runtime.

    +
    3. +
  3. +

    Futures exist in two versions, Futures 1.0 and Futures 3.0. Futures 1.0 was +known to have some issues regarding ergonomics. Turns out that modelling +async coding after Promises in JavaScript can turn in to extremely long errors +and type signatures with a type system as Rust.

    +
    4. +
+

Futures 3.0 are not compatible with Futures 1.0 without performing some work.

+
    +
  1. Async await syntax was recently stabilized
    2. +
+

what we'll +really do is to stub out a Reactor, and Executor and implement

@@ -180,30 +247,7 @@
- - - - - - - - - - diff --git a/book/0_1_1_trait_objects.html b/book/0_1_1_trait_objects.html new file mode 100644 index 0000000..44cea7a --- /dev/null +++ b/book/0_1_1_trait_objects.html @@ -0,0 +1,215 @@ + + + + + + Trait objects and fat pointers - Futures Explained in 200 Lines of Rust + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

Trait objects and fat pointers

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/book/0_1_2_generators_pin.html b/book/0_1_2_generators_pin.html new file mode 100644 index 0000000..a5bdbf1 --- /dev/null +++ b/book/0_1_2_generators_pin.html @@ -0,0 +1,215 @@ + + + + + + Generators and Pin - Futures Explained in 200 Lines of Rust + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

Generators and Pin

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/book/0_1_background_information.html b/book/0_1_background_information.html index ec542d5..2a953cd 100644 --- a/book/0_1_background_information.html +++ b/book/0_1_background_information.html @@ -1,5 +1,5 @@ - + @@ -32,11 +32,11 @@ - + @@ -60,11 +60,8 @@ var theme; try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } if (theme === null || theme === undefined) { theme = default_theme; } - var html = document.querySelector('html'); - html.classList.remove('no-js') - html.classList.remove('light') - html.classList.add(theme); - html.classList.add('js'); + document.body.className = theme; + document.querySelector('html').className = theme + ' js'; @@ -80,8 +77,8 @@ @@ -173,8 +170,8 @@ object we construct our selves.

Fat pointers in Rust

Let's take a look at the size of some different pointer types in Rust. If we run the following code:

-
use std::mem::size_of;
-trait SomeTrait { }
+
# use std::mem::size_of;
+trait SomeTrait { }
 
 fn main() {
     println!("Size of Box<i32>: {}", size_of::<Box<i32>>());
@@ -339,7 +336,7 @@ one. async std and 
                         
@@ -357,7 +354,7 @@ one. async std and 
                 
@@ -366,30 +363,7 @@ one. async std and 
-            var socket = new WebSocket("ws://localhost:3001");
-            socket.onmessage = function (event) {
-                if (event.data === "reload") {
-                    socket.close();
-                    location.reload(true); // force reload from server (not from cache)
-                }
-            };
 
-            window.onbeforeunload = function() {
-                socket.close();
-            }
-        
-        
-
-        
-
-        
-        
-        
-        
         
 
         
diff --git a/book/0_2_naive_implementation.html b/book/0_2_naive_implementation.html
index a6d6a4a..2356cc9 100644
--- a/book/0_2_naive_implementation.html
+++ b/book/0_2_naive_implementation.html
@@ -1,5 +1,5 @@
 
-
+
     
         
         
@@ -32,11 +32,11 @@
 
         
     
-    
+    
         
         
 
         
@@ -60,11 +60,8 @@
             var theme;
             try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
             if (theme === null || theme === undefined) { theme = default_theme; }
-            var html = document.querySelector('html');
-            html.classList.remove('no-js')
-            html.classList.remove('light')
-            html.classList.add(theme);
-            html.classList.add('js');
+            document.body.className = theme;
+            document.querySelector('html').className = theme + ' js';
         
 
         
@@ -80,8 +77,8 @@
         
 
         
@@ -297,125 +294,125 @@ fn main() {
     
     executor_run(reactor, readylist);
 }
-// ====== EXECUTOR ======
-fn executor_run(mut reactor: Reactor, rl: Arc<Mutex<Vec<usize>>>) {
-    let start = Instant::now();
-        loop {
-        let mut rl_locked = rl.lock().unwrap();
-        while let Some(event) = rl_locked.pop() {
-            let dur = (Instant::now() - start).as_secs_f32(); 
-            println!("Event {} just happened at time: {:.2}.", event, dur);
-            reactor.outstanding.fetch_sub(1, Ordering::Relaxed);
-        }
-        drop(rl_locked);
-
-        if reactor.outstanding.load(Ordering::Relaxed) == 0 {
-            reactor.close();
-            break;
-        }
-
-        thread::park();
-    }
-}
-
-// ====== "FUTURE" IMPL ======
-#[derive(Debug)]
-struct MyWaker {
-    id: usize,
-    thread: thread::Thread,
-    readylist: Arc<Mutex<Vec<usize>>>,
-}
-
-impl MyWaker {
-    fn new(id: usize, thread: thread::Thread, readylist: Arc<Mutex<Vec<usize>>>) -> Self {
-        MyWaker {
-            id,
-            thread,
-            readylist,
-        }
-    }
-
-    fn wake(&self) {
-        self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();
-        self.thread.unpark();
-    }
-}
-
-
-#[derive(Debug, Clone)]
-pub struct Task {
-    id: usize,
-    pending: bool, 
-}
-
-// ===== REACTOR =====
-struct Reactor {
-    dispatcher: Sender<Event>,
-    handle: Option<JoinHandle<()>>,
-    outstanding: AtomicUsize,
-}
-#[derive(Debug)]
-enum Event {
-    Close,
-    Simple(MyWaker, u64),
-}
-
-impl Reactor {
-    fn new() -> Self {
-        let (tx, rx) = channel::<Event>();
-        let mut handles = vec![];
-        let handle = thread::spawn(move || {
-            // This simulates some I/O resource
-            for event in rx {
-                match event {
-                    Event::Close => break,
-                    Event::Simple(mywaker, duration) => {
-                        let event_handle = thread::spawn(move || {
-                            thread::sleep(Duration::from_secs(duration));
-                            mywaker.wake();
-                        });
-                        handles.push(event_handle);
-                    }
-                }
-            }
-
-            for handle in handles {
-                handle.join().unwrap();
-            }
-        });
-
-        Reactor {
-            dispatcher: tx,
-            handle: Some(handle),
-            outstanding: AtomicUsize::new(0),
-        }
-    }
-
-    fn register(&mut self, duration: u64, mywaker: MyWaker) {
-        self.dispatcher
-            .send(Event::Simple(mywaker, duration))
-            .unwrap();
-        self.outstanding.fetch_add(1, Ordering::Relaxed);
-    }
-
-    fn close(&mut self) {
-        self.dispatcher.send(Event::Close).unwrap();
-    }
-}
-
-impl Drop for Reactor {
-    fn drop(&mut self) {
-        self.handle.take().map(|h| h.join().unwrap()).unwrap();
-    }
-}
-

+# // ====== EXECUTOR ======
+# fn executor_run(mut reactor: Reactor, rl: Arc<Mutex<Vec<usize>>>) {
+#     let start = Instant::now();
+#         loop {
+#         let mut rl_locked = rl.lock().unwrap();
+#         while let Some(event) = rl_locked.pop() {
+#             let dur = (Instant::now() - start).as_secs_f32(); 
+#             println!("Event {} just happened at time: {:.2}.", event, dur);
+#             reactor.outstanding.fetch_sub(1, Ordering::Relaxed);
+#         }
+#         drop(rl_locked);
+# 
+#         if reactor.outstanding.load(Ordering::Relaxed) == 0 {
+#             reactor.close();
+#             break;
+#         }
+# 
+#         thread::park();
+#     }
+# }
+# 
+# // ====== "FUTURE" IMPL ======
+# #[derive(Debug)]
+# struct MyWaker {
+#     id: usize,
+#     thread: thread::Thread,
+#     readylist: Arc<Mutex<Vec<usize>>>,
+# }
+# 
+# impl MyWaker {
+#     fn new(id: usize, thread: thread::Thread, readylist: Arc<Mutex<Vec<usize>>>) -> Self {
+#         MyWaker {
+#             id,
+#             thread,
+#             readylist,
+#         }
+#     }
+# 
+#     fn wake(&self) {
+#         self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();
+#         self.thread.unpark();
+#     }
+# }
+# 
+# 
+# #[derive(Debug, Clone)]
+# pub struct Task {
+#     id: usize,
+#     pending: bool, 
+# }
+# 
+# // ===== REACTOR =====
+# struct Reactor {
+#     dispatcher: Sender<Event>,
+#     handle: Option<JoinHandle<()>>,
+#     outstanding: AtomicUsize,
+# }
+# #[derive(Debug)]
+# enum Event {
+#     Close,
+#     Simple(MyWaker, u64),
+# }
+# 
+# impl Reactor {
+#     fn new() -> Self {
+#         let (tx, rx) = channel::<Event>();
+#         let mut handles = vec![];
+#         let handle = thread::spawn(move || {
+#             // This simulates some I/O resource
+#             for event in rx {
+#                 match event {
+#                     Event::Close => break,
+#                     Event::Simple(mywaker, duration) => {
+#                         let event_handle = thread::spawn(move || {
+#                             thread::sleep(Duration::from_secs(duration));
+#                             mywaker.wake();
+#                         });
+#                         handles.push(event_handle);
+#                     }
+#                 }
+#             }
+# 
+#             for handle in handles {
+#                 handle.join().unwrap();
+#             }
+#         });
+# 
+#         Reactor {
+#             dispatcher: tx,
+#             handle: Some(handle),
+#             outstanding: AtomicUsize::new(0),
+#         }
+#     }
+# 
+#     fn register(&mut self, duration: u64, mywaker: MyWaker) {
+#         self.dispatcher
+#             .send(Event::Simple(mywaker, duration))
+#             .unwrap();
+#         self.outstanding.fetch_add(1, Ordering::Relaxed);
+#     }
+# 
+#     fn close(&mut self) {
+#         self.dispatcher.send(Event::Close).unwrap();
+#     }
+# }
+# 
+# impl Drop for Reactor {
+#     fn drop(&mut self) {
+#         self.handle.take().map(|h| h.join().unwrap()).unwrap();
+#     }
+# }
+
- - - - - - - - - - diff --git a/book/print.html b/book/print.html index c526d01..a8d726a 100644 --- a/book/print.html +++ b/book/print.html @@ -1,5 +1,5 @@ - + @@ -34,11 +34,11 @@ - + @@ -62,11 +62,8 @@ var theme; try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } if (theme === null || theme === undefined) { theme = default_theme; } - var html = document.querySelector('html'); - html.classList.remove('no-js') - html.classList.remove('light') - html.classList.add(theme); - html.classList.add('js'); + document.body.className = theme; + document.querySelector('html').className = theme + ' js'; @@ -82,8 +79,8 @@ @@ -150,7 +147,77 @@
-

Introduction

+

Futures Explained in 200 Lines of Rust

+

This book aims to explain Futures in Rust using an example driven approach.

+

The goal is to get a better understanding of Futures by implementing a toy +Reactor, a very simple Executor and our own Futures.

+

We'll start off solving a small problem without Futures, Wakers or async/await +and then gradually adapt our example so it implements all these concepts, and +can be solved using the executor provided by both tokio and async_str.

+

In the end I've made some reader excercises you can do if you want to fix some +of the most glaring ommissions and shortcuts we took and create a slightly better +example yourself.

+

What does this book give you that isn't covered elsewhere?

+

That's a valid question. There are many good resources and examples already. First +of all, this book will point you to some background information that I have found +very valuable to get an understanding of concurrent programming in general.

+

I find that many discussions arise, not because Futures is a hard concept to +grasp, but that concurrent programming is a hard concept in general.

+

Secondly, I've always found small runnable examples very exiting to learn from. It's +all code that you can download, play with and learn from.

+

What we'll do and not

+

We'll:

+ +

We'll not:

+ +

I do want to explore Rusts internal implementation but that will be for a later +book.

+

Credits and thanks

+

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. Reading and exploring some of this code is nothing less than +impressive.

+

Why is Futures in Rust hard to understand

+

Well, I think it has to do with several things:

+
    +
  1. +

    Futures has a very interesting implementation, compiling down to a state +machine using generators to suspend and resume execution. In a language such as +Rust this is pretty hard to do ergonomically and safely. You are exposed to some +if this complexity when working with futures and want to understand them, not +only learn how to use them.

    +
    2. +
  2. +

    Rust doesn't provide a runtime. That means you'll actually have to choose one +yourself and actually know what a Reactor and an Executor is. While not +too difficult, you need to make more choices than you need in GO and other +languages designed with a concurrent programming in mind and ships with a +runtime.

    +
    3. +
  3. +

    Futures exist in two versions, Futures 1.0 and Futures 3.0. Futures 1.0 was +known to have some issues regarding ergonomics. Turns out that modelling +async coding after Promises in JavaScript can turn in to extremely long errors +and type signatures with a type system as Rust.

    +
    4. +
+

Futures 3.0 are not compatible with Futures 1.0 without performing some work.

+
    +
  1. Async await syntax was recently stabilized
    2. +
+

what we'll +really do is to stub out a Reactor, and Executor and implement

Some background information

Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter.

@@ -176,8 +243,8 @@ object we construct our selves.

Fat pointers in Rust

Let's take a look at the size of some different pointer types in Rust. If we run the following code:

-
use std::mem::size_of;
-trait SomeTrait { }
+
# use std::mem::size_of;
+trait SomeTrait { }
 
 fn main() {
     println!("Size of Box<i32>: {}", size_of::<Box<i32>>());
@@ -330,6 +397,8 @@ preferred runtime to actually do the scheduling and I/O queues.

 
It's important to know that Rust doesn't provide a runtime, so you have to choose
 one. async std and tokio are two popular ones.

 
With that out of the way, let's move on to our main example.

+
Trait objects and fat pointers

+
Generators and Pin

 
Naive example

 
use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::mpsc::{channel, Sender};
@@ -479,118 +548,118 @@ fn main() {
     
     executor_run(reactor, readylist);
 }
-// ====== EXECUTOR ======
-fn executor_run(mut reactor: Reactor, rl: Arc<Mutex<Vec<usize>>>) {
-    let start = Instant::now();
-        loop {
-        let mut rl_locked = rl.lock().unwrap();
-        while let Some(event) = rl_locked.pop() {
-            let dur = (Instant::now() - start).as_secs_f32(); 
-            println!("Event {} just happened at time: {:.2}.", event, dur);
-            reactor.outstanding.fetch_sub(1, Ordering::Relaxed);
-        }
-        drop(rl_locked);
-
-        if reactor.outstanding.load(Ordering::Relaxed) == 0 {
-            reactor.close();
-            break;
-        }
-
-        thread::park();
-    }
-}
-
-// ====== "FUTURE" IMPL ======
-#[derive(Debug)]
-struct MyWaker {
-    id: usize,
-    thread: thread::Thread,
-    readylist: Arc<Mutex<Vec<usize>>>,
-}
-
-impl MyWaker {
-    fn new(id: usize, thread: thread::Thread, readylist: Arc<Mutex<Vec<usize>>>) -> Self {
-        MyWaker {
-            id,
-            thread,
-            readylist,
-        }
-    }
-
-    fn wake(&self) {
-        self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();
-        self.thread.unpark();
-    }
-}
-
-
-#[derive(Debug, Clone)]
-pub struct Task {
-    id: usize,
-    pending: bool, 
-}
-
-// ===== REACTOR =====
-struct Reactor {
-    dispatcher: Sender<Event>,
-    handle: Option<JoinHandle<()>>,
-    outstanding: AtomicUsize,
-}
-#[derive(Debug)]
-enum Event {
-    Close,
-    Simple(MyWaker, u64),
-}
-
-impl Reactor {
-    fn new() -> Self {
-        let (tx, rx) = channel::<Event>();
-        let mut handles = vec![];
-        let handle = thread::spawn(move || {
-            // This simulates some I/O resource
-            for event in rx {
-                match event {
-                    Event::Close => break,
-                    Event::Simple(mywaker, duration) => {
-                        let event_handle = thread::spawn(move || {
-                            thread::sleep(Duration::from_secs(duration));
-                            mywaker.wake();
-                        });
-                        handles.push(event_handle);
-                    }
-                }
-            }
-
-            for handle in handles {
-                handle.join().unwrap();
-            }
-        });
-
-        Reactor {
-            dispatcher: tx,
-            handle: Some(handle),
-            outstanding: AtomicUsize::new(0),
-        }
-    }
-
-    fn register(&mut self, duration: u64, mywaker: MyWaker) {
-        self.dispatcher
-            .send(Event::Simple(mywaker, duration))
-            .unwrap();
-        self.outstanding.fetch_add(1, Ordering::Relaxed);
-    }
-
-    fn close(&mut self) {
-        self.dispatcher.send(Event::Close).unwrap();
-    }
-}
-
-impl Drop for Reactor {
-    fn drop(&mut self) {
-        self.handle.take().map(|h| h.join().unwrap()).unwrap();
-    }
-}
-

+# // ====== EXECUTOR ======
+# fn executor_run(mut reactor: Reactor, rl: Arc<Mutex<Vec<usize>>>) {
+#     let start = Instant::now();
+#         loop {
+#         let mut rl_locked = rl.lock().unwrap();
+#         while let Some(event) = rl_locked.pop() {
+#             let dur = (Instant::now() - start).as_secs_f32(); 
+#             println!("Event {} just happened at time: {:.2}.", event, dur);
+#             reactor.outstanding.fetch_sub(1, Ordering::Relaxed);
+#         }
+#         drop(rl_locked);
+# 
+#         if reactor.outstanding.load(Ordering::Relaxed) == 0 {
+#             reactor.close();
+#             break;
+#         }
+# 
+#         thread::park();
+#     }
+# }
+# 
+# // ====== "FUTURE" IMPL ======
+# #[derive(Debug)]
+# struct MyWaker {
+#     id: usize,
+#     thread: thread::Thread,
+#     readylist: Arc<Mutex<Vec<usize>>>,
+# }
+# 
+# impl MyWaker {
+#     fn new(id: usize, thread: thread::Thread, readylist: Arc<Mutex<Vec<usize>>>) -> Self {
+#         MyWaker {
+#             id,
+#             thread,
+#             readylist,
+#         }
+#     }
+# 
+#     fn wake(&self) {
+#         self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();
+#         self.thread.unpark();
+#     }
+# }
+# 
+# 
+# #[derive(Debug, Clone)]
+# pub struct Task {
+#     id: usize,
+#     pending: bool, 
+# }
+# 
+# // ===== REACTOR =====
+# struct Reactor {
+#     dispatcher: Sender<Event>,
+#     handle: Option<JoinHandle<()>>,
+#     outstanding: AtomicUsize,
+# }
+# #[derive(Debug)]
+# enum Event {
+#     Close,
+#     Simple(MyWaker, u64),
+# }
+# 
+# impl Reactor {
+#     fn new() -> Self {
+#         let (tx, rx) = channel::<Event>();
+#         let mut handles = vec![];
+#         let handle = thread::spawn(move || {
+#             // This simulates some I/O resource
+#             for event in rx {
+#                 match event {
+#                     Event::Close => break,
+#                     Event::Simple(mywaker, duration) => {
+#                         let event_handle = thread::spawn(move || {
+#                             thread::sleep(Duration::from_secs(duration));
+#                             mywaker.wake();
+#                         });
+#                         handles.push(event_handle);
+#                     }
+#                 }
+#             }
+# 
+#             for handle in handles {
+#                 handle.join().unwrap();
+#             }
+#         });
+# 
+#         Reactor {
+#             dispatcher: tx,
+#             handle: Some(handle),
+#             outstanding: AtomicUsize::new(0),
+#         }
+#     }
+# 
+#     fn register(&mut self, duration: u64, mywaker: MyWaker) {
+#         self.dispatcher
+#             .send(Event::Simple(mywaker, duration))
+#             .unwrap();
+#         self.outstanding.fetch_add(1, Ordering::Relaxed);
+#     }
+# 
+#     fn close(&mut self) {
+#         self.dispatcher.send(Event::Close).unwrap();
+#     }
+# }
+# 
+# impl Drop for Reactor {
+#     fn drop(&mut self) {
+#         self.handle.take().map(|h| h.join().unwrap()).unwrap();
+#     }
+# }
+

 
Proper Waker

 
Proper Future

 
Supporting async/await

@@ -618,30 +687,7 @@ fn main() {
- - - - - - - - - - diff --git a/book/searchindex.js b/book/searchindex.js index 9604a94..9c727ca 100644 --- a/book/searchindex.js +++ b/book/searchindex.js @@ -1 +1 @@ -Object.assign(window.search, {"doc_urls":["0_0_introduction.html#introduction","0_1_background_information.html#some-background-information","0_1_background_information.html#concurrency-in-general","0_1_background_information.html#trait-objects-and-dynamic-dispatch","0_1_background_information.html#fat-pointers-in-rust","0_1_background_information.html#reactorexecutor-pattern","0_2_naive_implementation.html#naive-example","0_3_proper_waker.html#proper-waker","0_4_proper_future.html#proper-future","0_5_async_wait.html#supporting-asyncawait","0_6_concurrent_futures.html#bonus-concurrent-futures"],"index":{"documentStore":{"docInfo":{"0":{"body":0,"breadcrumbs":1,"title":1},"1":{"body":13,"breadcrumbs":2,"title":2},"10":{"body":0,"breadcrumbs":3,"title":3},"2":{"body":43,"breadcrumbs":2,"title":2},"3":{"body":42,"breadcrumbs":4,"title":4},"4":{"body":380,"breadcrumbs":3,"title":3},"5":{"body":162,"breadcrumbs":2,"title":2},"6":{"body":374,"breadcrumbs":2,"title":2},"7":{"body":0,"breadcrumbs":2,"title":2},"8":{"body":0,"breadcrumbs":2,"title":2},"9":{"body":0,"breadcrumbs":2,"title":2}},"docs":{"0":{"body":"","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter.","breadcrumbs":"Some background information","id":"1","title":"Some background information"},"10":{"body":"","breadcrumbs":"Bonus: concurrent futures","id":"10","title":"Bonus: concurrent futures"},"2":{"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","breadcrumbs":"Concurrency in general","id":"2","title":"Concurrency in general"},"3":{"body":"The single most confusing topic we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows using 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 this article: https://alschwalm.com/blog/static/2017/03/07/exploring-dynamic-dispatch-in-rust/ Let's explain this a bit more in detail.","breadcrumbs":"Trait objects and dynamic dispatch","id":"3","title":"Trait objects and dynamic dispatch"},"4":{"body":"Let's take a look at the size of some different pointer types in Rust. If we run the following code: # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &i32: {}\", size_of::<&i32>()); println!(\"Size of &Box: {}\", size_of::<&Box>()); println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &dyn Trait: {}\", size_of::<&dyn SomeTrait>()); println!(\"Size of &[i32]: {}\", size_of::<&[i32]>()); println!(\"Size of &[&dyn Trait]: {}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Size of [i32; 10]: {}\", size_of::<[i32; 10]>()); println!(\"Size of [&dyn Trait; 10]: {}\", size_of::<[&dyn SomeTrait; 10]>());\n} As you see from the output after running this, the sizes of the references varies. Most 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 more extra information. In the case of &[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. The one we'll concern ourselves about is the references to traits, or trait objects as they're called in Rust. &dyn SomeTrait is an example of 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 allow this we use dynamic dispatch. Let's explain this in code instead of words by implementing our own trait object from these parts: // 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. // Try changing the order of add and sub and see what happens. add as usize, // function pointer sub as usize, // function pointer mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::(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} If you run this code by pressing the \"play\" button at the top you'll se it outputs just what we expect. This code example is editable so you can change it and run it to see what happens. The reason we go through this will be clear later on when we implement our own Waker we'll actually set up a vtable like we do here to and knowing what it is will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"4","title":"Fat pointers in Rust"},"5":{"body":"If you don't know what this is, you should take a few minutes and read about it. You will encounter the term Reactor and Executor a lot when working with async code in Rust. I have written a quick introduction explaining this pattern before which you can take a look at here: homepage Epoll, Kqueue and IOCP Explained - The Reactor-Executor Pattern I'll re-iterate the most important parts here. This pattern consists of at least 2 parts: A reactor handles some kind of event queue has the responsibility of respoonding to events An executor Often has a scheduler Holds a set of suspended tasks, and has the responsibility of resuming them when an event has occurred The concept of a task A set of operations that can be stopped half way and resumed later on This is a pattern not only used in Rust, but it's very popular in Rust due to how well it separates concerns between handling and scheduling tasks, and queing and responding to I/O events. The only thing Rust as a language defines is the task . In Rust we call an incorruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. In addition, Rust provides a way for the Reactor and Executor to communicate through the Waker. We'll get to know these in the following chapters. Providing these pieces let's Rust take care a lot of the ergonomic \"friction\" programmers meet when faced with async code, and still not dictate any preferred runtime to actually do the scheduling and I/O queues. It's important to know that Rust doesn't provide a runtime, so you have to choose one. async std and tokio are two popular ones. With that out of the way, let's move on to our main example.","breadcrumbs":"Reactor/Executor pattern","id":"5","title":"Reactor/Executor pattern"},"6":{"body":"use std::sync::atomic::{AtomicUsize, Ordering};\nuse std::sync::mpsc::{channel, Sender};\nuse std::sync::{Arc, Mutex};\nuse std::thread::{self, JoinHandle};\nuse std::time::{Duration, Instant}; fn main() { let readylist = Arc::new(Mutex::new(vec![])); let mut reactor = Reactor::new(); let mywaker = MyWaker::new(1, thread::current(), readylist.clone()); reactor.register(2, mywaker); let mywaker = MyWaker::new(2, thread::current(), readylist.clone()); reactor.register(2, mywaker); executor_run(reactor, readylist);\n}\n// ====== EXECUTOR ======\nfn executor_run(mut reactor: Reactor, rl: Arc>>) { let start = Instant::now(); loop { let mut rl_locked = rl.lock().unwrap(); while let Some(event) = rl_locked.pop() { let dur = (Instant::now() - start).as_secs_f32(); println!(\"Event {} just happened at time: {:.2}.\", event, dur); reactor.outstanding.fetch_sub(1, Ordering::Relaxed); } drop(rl_locked); if reactor.outstanding.load(Ordering::Relaxed) == 0 { reactor.close(); break; } thread::park(); }\n} // ====== \"FUTURE\" IMPL ======\n#[derive(Debug)]\nstruct MyWaker { id: usize, thread: thread::Thread, readylist: Arc>>,\n} impl MyWaker { fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self { MyWaker { id, thread, readylist, } } fn wake(&self) { self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap(); self.thread.unpark(); }\n} #[derive(Debug, Clone)]\npub struct Task { id: usize, pending: bool, } // ===== REACTOR =====\nstruct Reactor { dispatcher: Sender, handle: Option>, outstanding: AtomicUsize,\n}\n#[derive(Debug)]\nenum Event { Close, Simple(MyWaker, u64),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { match event { Event::Close => break, Event::Simple(mywaker, duration) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); mywaker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { dispatcher: tx, handle: Some(handle), outstanding: AtomicUsize::new(0), } } fn register(&mut self, duration: u64, mywaker: MyWaker) { self.dispatcher .send(Event::Simple(mywaker, duration)) .unwrap(); self.outstanding.fetch_add(1, Ordering::Relaxed); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} use std::sync::atomic::{AtomicUsize, Ordering};\nuse std::sync::mpsc::{channel, Sender};\nuse std::sync::{Arc, Mutex};\nuse std::thread::{self, JoinHandle};\nuse std::time::{Duration, Instant}; fn main() { let readylist = Arc::new(Mutex::new(vec![])); let mut reactor = Reactor::new(); let mywaker = MyWaker::new(1, thread::current(), readylist.clone()); reactor.register(2, mywaker); let mywaker = MyWaker::new(2, thread::current(), readylist.clone()); reactor.register(2, mywaker); executor_run(reactor, readylist);\n}\n# // ====== EXECUTOR ======\n# fn executor_run(mut reactor: Reactor, rl: Arc>>) {\n# let start = Instant::now();\n# loop {\n# let mut rl_locked = rl.lock().unwrap();\n# while let Some(event) = rl_locked.pop() {\n# let dur = (Instant::now() - start).as_secs_f32(); # println!(\"Event {} just happened at time: {:.2}.\", event, dur);\n# reactor.outstanding.fetch_sub(1, Ordering::Relaxed);\n# }\n# drop(rl_locked);\n# # if reactor.outstanding.load(Ordering::Relaxed) == 0 {\n# reactor.close();\n# break;\n# }\n# # thread::park();\n# }\n# }\n# # // ====== \"FUTURE\" IMPL ======\n# #[derive(Debug)]\n# struct MyWaker {\n# id: usize,\n# thread: thread::Thread,\n# readylist: Arc>>,\n# }\n# # impl MyWaker {\n# fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self {\n# MyWaker {\n# 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loop { let mut rl_locked = rl.lock().unwrap(); while let Some(event) = rl_locked.pop() { let dur = (Instant::now() - start).as_secs_f32(); println!(\"Event {} just happened at time: {:.2}.\", event, dur); reactor.outstanding.fetch_sub(1, Ordering::Relaxed); } drop(rl_locked); if reactor.outstanding.load(Ordering::Relaxed) == 0 { reactor.close(); break; } thread::park(); }\n} // ====== \"FUTURE\" IMPL ======\n#[derive(Debug)]\nstruct MyWaker { id: usize, thread: thread::Thread, readylist: Arc>>,\n} impl MyWaker { fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self { MyWaker { id, thread, readylist, } } fn wake(&self) { self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap(); self.thread.unpark(); }\n} #[derive(Debug, Clone)]\npub struct Task { id: usize, pending: bool, } // ===== REACTOR =====\nstruct Reactor { dispatcher: Sender, handle: Option>, outstanding: AtomicUsize,\n}\n#[derive(Debug)]\nenum Event { Close, Simple(MyWaker, u64),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { match event { Event::Close => break, Event::Simple(mywaker, duration) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); mywaker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { dispatcher: tx, handle: Some(handle), outstanding: AtomicUsize::new(0), } } fn register(&mut self, duration: u64, mywaker: MyWaker) { self.dispatcher .send(Event::Simple(mywaker, duration)) .unwrap(); self.outstanding.fetch_add(1, Ordering::Relaxed); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} use std::sync::atomic::{AtomicUsize, Ordering};\nuse std::sync::mpsc::{channel, Sender};\nuse std::sync::{Arc, Mutex};\nuse std::thread::{self, JoinHandle};\nuse std::time::{Duration, Instant}; fn main() { let readylist = Arc::new(Mutex::new(vec![])); let mut reactor = Reactor::new(); let mywaker = MyWaker::new(1, thread::current(), readylist.clone()); reactor.register(2, mywaker); let mywaker = MyWaker::new(2, thread::current(), readylist.clone()); reactor.register(2, mywaker); executor_run(reactor, readylist);\n}\n# // ====== EXECUTOR ======\n# fn executor_run(mut reactor: Reactor, rl: Arc>>) {\n# let start = Instant::now();\n# loop {\n# let mut rl_locked = rl.lock().unwrap();\n# while let Some(event) = rl_locked.pop() {\n# let dur = (Instant::now() - start).as_secs_f32(); # println!(\"Event {} just happened at time: {:.2}.\", event, dur);\n# reactor.outstanding.fetch_sub(1, Ordering::Relaxed);\n# }\n# drop(rl_locked);\n# # if reactor.outstanding.load(Ordering::Relaxed) == 0 {\n# reactor.close();\n# break;\n# }\n# # thread::park();\n# }\n# }\n# # // ====== \"FUTURE\" IMPL ======\n# #[derive(Debug)]\n# struct MyWaker {\n# id: usize,\n# thread: thread::Thread,\n# readylist: Arc>>,\n# }\n# # impl MyWaker {\n# fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self {\n# MyWaker {\n# id,\n# thread,\n# readylist,\n# }\n# }\n# # fn wake(&self) {\n# self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();\n# self.thread.unpark();\n# }\n# }\n# # # #[derive(Debug, Clone)]\n# pub struct Task {\n# id: usize,\n# pending: bool, # }\n# # // ===== REACTOR =====\n# struct Reactor {\n# dispatcher: Sender,\n# handle: Option>,\n# outstanding: AtomicUsize,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Simple(MyWaker, u64),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# match event {\n# Event::Close => break,\n# Event::Simple(mywaker, duration) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# mywaker.wake();\n# });\n# handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# dispatcher: tx,\n# handle: Some(handle),\n# outstanding: AtomicUsize::new(0),\n# }\n# }\n# # fn register(&mut self, duration: u64, mywaker: MyWaker) {\n# self.dispatcher\n# .send(Event::Simple(mywaker, duration))\n# .unwrap();\n# self.outstanding.fetch_add(1, Ordering::Relaxed);\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).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# }","breadcrumbs":"Naive example","id":"12","title":"Naive example"},"13":{"body":"","breadcrumbs":"Proper Waker","id":"13","title":"Proper Waker"},"14":{"body":"","breadcrumbs":"Proper Future","id":"14","title":"Proper Future"},"15":{"body":"","breadcrumbs":"Supporting async/await","id":"15","title":"Supporting async/await"},"16":{"body":"","breadcrumbs":"Bonus: concurrent futures","id":"16","title":"Bonus: concurrent futures"},"2":{"body":"We'll: Implement our own Futures and get to know the Reactor/Executor pattern Implement our own waker and learn why it's a bit foreign compared to other types Talk a bit about runtime complexity and what to keep in mind when writing async Rust. Make sure all examples can be run on the playground Not rely on any helpers or libraries, but try to face the complexity and learn We'll not: Talk about how futures are implemented in Rust the language, the state machine and so on Explain how the different runtimes differ, however, you'll hopefully be a bit better off if you read this before you go research them Explain concurrent programming, but I will supply sources I do want to explore Rusts internal implementation but that will be for a later book.","breadcrumbs":"What we'll do and not","id":"2","title":"What we'll do and not"},"3":{"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. Reading and exploring some of this code is nothing less than impressive.","breadcrumbs":"Credits and thanks","id":"3","title":"Credits and thanks"},"4":{"body":"Well, I think it has to do with several things: Futures has a very interesting implementation, compiling down to a state machine using generators to suspend and resume execution. In a language such as Rust this is pretty hard to do ergonomically and safely. You are exposed to some if this complexity when working with futures and want to understand them, not only learn how to use them. Rust doesn't provide a runtime. That means you'll actually have to choose one yourself and actually know what a Reactor and an Executor is. While not too difficult, you need to make more choices than you need in GO and other languages designed with a concurrent programming in mind and ships with a runtime. Futures exist in two versions, Futures 1.0 and Futures 3.0. Futures 1.0 was known to have some issues regarding ergonomics. Turns out that modelling async coding after Promises in JavaScript can turn in to extremely long errors and type signatures with a type system as Rust. Futures 3.0 are not compatible with Futures 1.0 without performing some work. Async await syntax was recently stabilized what we'll really do is to stub out a Reactor, and Executor and implement","breadcrumbs":"Why is Futures in Rust hard to understand","id":"4","title":"Why is Futures in Rust hard to understand"},"5":{"body":"Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter.","breadcrumbs":"Some background information","id":"5","title":"Some background information"},"6":{"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","breadcrumbs":"Concurrency in general","id":"6","title":"Concurrency in general"},"7":{"body":"The single most confusing topic we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows using 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 this article: https://alschwalm.com/blog/static/2017/03/07/exploring-dynamic-dispatch-in-rust/ Let's explain this a bit more in detail.","breadcrumbs":"Trait objects and dynamic dispatch","id":"7","title":"Trait objects and dynamic dispatch"},"8":{"body":"Let's take a look at the size of some different pointer types in Rust. If we run the following code: # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &i32: {}\", size_of::<&i32>()); println!(\"Size of &Box: {}\", size_of::<&Box>()); println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &dyn Trait: {}\", size_of::<&dyn SomeTrait>()); println!(\"Size of &[i32]: {}\", size_of::<&[i32]>()); println!(\"Size of &[&dyn Trait]: {}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Size of [i32; 10]: {}\", size_of::<[i32; 10]>()); println!(\"Size of [&dyn Trait; 10]: {}\", size_of::<[&dyn SomeTrait; 10]>());\n} As you see from the output after running this, the sizes of the references varies. Most 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 more extra information. In the case of &[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. The one we'll concern ourselves about is the references to traits, or trait objects as they're called in Rust. &dyn SomeTrait is an example of 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 allow this we use dynamic dispatch. Let's explain this in code instead of words by implementing our own trait object from these parts: // 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. // Try changing the order of add and sub and see what happens. add as usize, // function pointer sub as usize, // function pointer mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::(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} If you run this code by pressing the \"play\" button at the top you'll se it outputs just what we expect. This code example is editable so you can change it and run it to see what happens. The reason we go through this will be clear later on when we implement our own Waker we'll actually set up a vtable like we do here to and knowing what it is will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"8","title":"Fat pointers in Rust"},"9":{"body":"If you don't know what this is, you should take a few minutes and read about it. You will encounter the term Reactor and Executor a lot when working with async code in Rust. I have written a quick introduction explaining this pattern before which you can take a look at here: homepage Epoll, Kqueue and IOCP Explained - The Reactor-Executor Pattern I'll re-iterate the most important parts here. This pattern consists of at least 2 parts: A reactor handles some kind of event queue has the responsibility of respoonding to events An executor Often has a scheduler Holds a set of suspended tasks, and has the responsibility of resuming them when an event has occurred The concept of a task A set of operations that can be stopped half way and resumed later on This is a pattern not only used in Rust, but it's very popular in Rust due to how well it separates concerns between handling and scheduling tasks, and queing and responding to I/O events. The only thing Rust as a language defines is the task . In Rust we call an incorruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. In addition, Rust provides a way for the Reactor and Executor to communicate through the Waker. We'll get to know these in the following chapters. Providing these pieces let's Rust take care a lot of the ergonomic \"friction\" programmers meet when faced with async code, and still not dictate any preferred runtime to actually do the scheduling and I/O queues. It's important to know that Rust doesn't provide a runtime, so you have to choose one. async std and tokio are two popular ones. 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If we run the following code: # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &i32: {}\", size_of::<&i32>()); println!(\"Size of &Box: {}\", size_of::<&Box>()); println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &dyn Trait: {}\", size_of::<&dyn SomeTrait>()); println!(\"Size of &[i32]: {}\", size_of::<&[i32]>()); println!(\"Size of &[&dyn Trait]: {}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Size of [i32; 10]: {}\", size_of::<[i32; 10]>()); println!(\"Size of [&dyn Trait; 10]: {}\", size_of::<[&dyn SomeTrait; 10]>());\n} As you see from the output after running this, the sizes of the references varies. Most 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 more extra information. In the case of &[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. The one we'll concern ourselves about is the references to traits, or trait objects as they're called in Rust. &dyn SomeTrait is an example of 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 allow this we use dynamic dispatch. Let's explain this in code instead of words by implementing our own trait object from these parts: // 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. // Try changing the order of add and sub and see what happens. add as usize, // function pointer sub as usize, // function pointer mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::(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} If you run this code by pressing the \"play\" button at the top you'll se it outputs just what we expect. This code example is editable so you can change it and run it to see what happens. The reason we go through this will be clear later on when we implement our own Waker we'll actually set up a vtable like we do here to and knowing what it is will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"4","title":"Fat pointers in Rust"},"5":{"body":"If you don't know what this is, you should take a few minutes and read about it. You will encounter the term Reactor and Executor a lot when working with async code in Rust. I have written a quick introduction explaining this pattern before which you can take a look at here: homepage Epoll, Kqueue and IOCP Explained - The Reactor-Executor Pattern I'll re-iterate the most important parts here. This pattern consists of at least 2 parts: A reactor handles some kind of event queue has the responsibility of respoonding to events An executor Often has a scheduler Holds a set of suspended tasks, and has the responsibility of resuming them when an event has occurred The concept of a task A set of operations that can be stopped half way and resumed later on This is a pattern not only used in Rust, but it's very popular in Rust due to how well it separates concerns between handling and scheduling tasks, and queing and responding to I/O events. The only thing Rust as a language defines is the task . In Rust we call an incorruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. In addition, Rust provides a way for the Reactor and Executor to communicate through the Waker. We'll get to know these in the following chapters. Providing these pieces let's Rust take care a lot of the ergonomic \"friction\" programmers meet when faced with async code, and still not dictate any preferred runtime to actually do the scheduling and I/O queues. It's important to know that Rust doesn't provide a runtime, so you have to choose one. async std and tokio are two popular ones. 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reactor.outstanding.fetch_sub(1, Ordering::Relaxed); } drop(rl_locked); if reactor.outstanding.load(Ordering::Relaxed) == 0 { reactor.close(); break; } thread::park(); }\n} // ====== \"FUTURE\" IMPL ======\n#[derive(Debug)]\nstruct MyWaker { id: usize, thread: thread::Thread, readylist: Arc>>,\n} impl MyWaker { fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self { MyWaker { id, thread, readylist, } } fn wake(&self) { self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap(); self.thread.unpark(); }\n} #[derive(Debug, Clone)]\npub struct Task { id: usize, pending: bool, } // ===== REACTOR =====\nstruct Reactor { dispatcher: Sender, handle: Option>, outstanding: AtomicUsize,\n}\n#[derive(Debug)]\nenum Event { Close, Simple(MyWaker, u64),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { match event { Event::Close => break, Event::Simple(mywaker, duration) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); mywaker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { dispatcher: tx, handle: Some(handle), outstanding: AtomicUsize::new(0), } } fn register(&mut self, duration: u64, mywaker: MyWaker) { self.dispatcher .send(Event::Simple(mywaker, duration)) .unwrap(); self.outstanding.fetch_add(1, Ordering::Relaxed); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} use std::sync::atomic::{AtomicUsize, Ordering};\nuse std::sync::mpsc::{channel, Sender};\nuse std::sync::{Arc, Mutex};\nuse std::thread::{self, JoinHandle};\nuse std::time::{Duration, Instant}; fn main() { let readylist = Arc::new(Mutex::new(vec![])); let mut reactor = Reactor::new(); let mywaker = MyWaker::new(1, thread::current(), readylist.clone()); reactor.register(2, mywaker); let mywaker = MyWaker::new(2, thread::current(), readylist.clone()); reactor.register(2, mywaker); executor_run(reactor, readylist);\n}\n# // ====== EXECUTOR ======\n# fn executor_run(mut reactor: Reactor, rl: Arc>>) {\n# let start = Instant::now();\n# loop {\n# let mut rl_locked = rl.lock().unwrap();\n# while let Some(event) = rl_locked.pop() {\n# let dur = (Instant::now() - start).as_secs_f32(); # println!(\"Event {} just happened at time: {:.2}.\", event, dur);\n# reactor.outstanding.fetch_sub(1, Ordering::Relaxed);\n# }\n# drop(rl_locked);\n# # if reactor.outstanding.load(Ordering::Relaxed) == 0 {\n# reactor.close();\n# break;\n# }\n# # thread::park();\n# }\n# }\n# # // ====== \"FUTURE\" IMPL ======\n# #[derive(Debug)]\n# struct MyWaker {\n# id: usize,\n# thread: thread::Thread,\n# readylist: Arc>>,\n# }\n# # impl MyWaker {\n# fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self {\n# MyWaker {\n# 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loop { let mut rl_locked = rl.lock().unwrap(); while let Some(event) = rl_locked.pop() { let dur = (Instant::now() - start).as_secs_f32(); println!(\"Event {} just happened at time: {:.2}.\", event, dur); reactor.outstanding.fetch_sub(1, Ordering::Relaxed); } drop(rl_locked); if reactor.outstanding.load(Ordering::Relaxed) == 0 { reactor.close(); break; } thread::park(); }\n} // ====== \"FUTURE\" IMPL ======\n#[derive(Debug)]\nstruct MyWaker { id: usize, thread: thread::Thread, readylist: Arc>>,\n} impl MyWaker { fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self { MyWaker { id, thread, readylist, } } fn wake(&self) { self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap(); self.thread.unpark(); }\n} #[derive(Debug, Clone)]\npub struct Task { id: usize, pending: bool, } // ===== REACTOR =====\nstruct Reactor { dispatcher: Sender, handle: Option>, outstanding: AtomicUsize,\n}\n#[derive(Debug)]\nenum Event { Close, Simple(MyWaker, u64),\n} impl Reactor { fn new() -> Self { let (tx, rx) = channel::(); let mut handles = vec![]; let handle = thread::spawn(move || { // This simulates some I/O resource for event in rx { match event { Event::Close => break, Event::Simple(mywaker, duration) => { let event_handle = thread::spawn(move || { thread::sleep(Duration::from_secs(duration)); mywaker.wake(); }); handles.push(event_handle); } } } for handle in handles { handle.join().unwrap(); } }); Reactor { dispatcher: tx, handle: Some(handle), outstanding: AtomicUsize::new(0), } } fn register(&mut self, duration: u64, mywaker: MyWaker) { self.dispatcher .send(Event::Simple(mywaker, duration)) .unwrap(); self.outstanding.fetch_add(1, Ordering::Relaxed); } fn close(&mut self) { self.dispatcher.send(Event::Close).unwrap(); }\n} impl Drop for Reactor { fn drop(&mut self) { self.handle.take().map(|h| h.join().unwrap()).unwrap(); }\n} use std::sync::atomic::{AtomicUsize, Ordering};\nuse std::sync::mpsc::{channel, Sender};\nuse std::sync::{Arc, Mutex};\nuse std::thread::{self, JoinHandle};\nuse std::time::{Duration, Instant}; fn main() { let readylist = Arc::new(Mutex::new(vec![])); let mut reactor = Reactor::new(); let mywaker = MyWaker::new(1, thread::current(), readylist.clone()); reactor.register(2, mywaker); let mywaker = MyWaker::new(2, thread::current(), readylist.clone()); reactor.register(2, mywaker); executor_run(reactor, readylist);\n}\n# // ====== EXECUTOR ======\n# fn executor_run(mut reactor: Reactor, rl: Arc>>) {\n# let start = Instant::now();\n# loop {\n# let mut rl_locked = rl.lock().unwrap();\n# while let Some(event) = rl_locked.pop() {\n# let dur = (Instant::now() - start).as_secs_f32(); # println!(\"Event {} just happened at time: {:.2}.\", event, dur);\n# reactor.outstanding.fetch_sub(1, Ordering::Relaxed);\n# }\n# drop(rl_locked);\n# # if reactor.outstanding.load(Ordering::Relaxed) == 0 {\n# reactor.close();\n# break;\n# }\n# # thread::park();\n# }\n# }\n# # // ====== \"FUTURE\" IMPL ======\n# #[derive(Debug)]\n# struct MyWaker {\n# id: usize,\n# thread: thread::Thread,\n# readylist: Arc>>,\n# }\n# # impl MyWaker {\n# fn new(id: usize, thread: thread::Thread, readylist: Arc>>) -> Self {\n# MyWaker {\n# id,\n# thread,\n# readylist,\n# }\n# }\n# # fn wake(&self) {\n# self.readylist.lock().map(|mut rl| rl.push(self.id)).unwrap();\n# self.thread.unpark();\n# }\n# }\n# # # #[derive(Debug, Clone)]\n# pub struct Task {\n# id: usize,\n# pending: bool, # }\n# # // ===== REACTOR =====\n# struct Reactor {\n# dispatcher: Sender,\n# handle: Option>,\n# outstanding: AtomicUsize,\n# }\n# #[derive(Debug)]\n# enum Event {\n# Close,\n# Simple(MyWaker, u64),\n# }\n# # impl Reactor {\n# fn new() -> Self {\n# let (tx, rx) = channel::();\n# let mut handles = vec![];\n# let handle = thread::spawn(move || {\n# // This simulates some I/O resource\n# for event in rx {\n# match event {\n# Event::Close => break,\n# Event::Simple(mywaker, duration) => {\n# let event_handle = thread::spawn(move || {\n# thread::sleep(Duration::from_secs(duration));\n# mywaker.wake();\n# });\n# handles.push(event_handle);\n# }\n# }\n# }\n# # for handle in handles {\n# handle.join().unwrap();\n# }\n# });\n# # Reactor {\n# dispatcher: tx,\n# handle: Some(handle),\n# outstanding: AtomicUsize::new(0),\n# }\n# }\n# # fn register(&mut self, duration: u64, mywaker: MyWaker) {\n# self.dispatcher\n# .send(Event::Simple(mywaker, duration))\n# .unwrap();\n# self.outstanding.fetch_add(1, Ordering::Relaxed);\n# }\n# # fn close(&mut self) {\n# self.dispatcher.send(Event::Close).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# }","breadcrumbs":"Naive example","id":"12","title":"Naive example"},"13":{"body":"","breadcrumbs":"Proper Waker","id":"13","title":"Proper Waker"},"14":{"body":"","breadcrumbs":"Proper Future","id":"14","title":"Proper Future"},"15":{"body":"","breadcrumbs":"Supporting async/await","id":"15","title":"Supporting async/await"},"16":{"body":"","breadcrumbs":"Bonus: concurrent futures","id":"16","title":"Bonus: concurrent futures"},"2":{"body":"We'll: Implement our own Futures and get to know the Reactor/Executor pattern Implement our own waker and learn why it's a bit foreign compared to other types Talk a bit about runtime complexity and what to keep in mind when writing async Rust. Make sure all examples can be run on the playground Not rely on any helpers or libraries, but try to face the complexity and learn We'll not: Talk about how futures are implemented in Rust the language, the state machine and so on Explain how the different runtimes differ, however, you'll hopefully be a bit better off if you read this before you go research them Explain concurrent programming, but I will supply sources I do want to explore Rusts internal implementation but that will be for a later book.","breadcrumbs":"What we'll do and not","id":"2","title":"What we'll do and not"},"3":{"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. Reading and exploring some of this code is nothing less than impressive.","breadcrumbs":"Credits and thanks","id":"3","title":"Credits and thanks"},"4":{"body":"Well, I think it has to do with several things: Futures has a very interesting implementation, compiling down to a state machine using generators to suspend and resume execution. In a language such as Rust this is pretty hard to do ergonomically and safely. You are exposed to some if this complexity when working with futures and want to understand them, not only learn how to use them. Rust doesn't provide a runtime. That means you'll actually have to choose one yourself and actually know what a Reactor and an Executor is. While not too difficult, you need to make more choices than you need in GO and other languages designed with a concurrent programming in mind and ships with a runtime. Futures exist in two versions, Futures 1.0 and Futures 3.0. Futures 1.0 was known to have some issues regarding ergonomics. Turns out that modelling async coding after Promises in JavaScript can turn in to extremely long errors and type signatures with a type system as Rust. Futures 3.0 are not compatible with Futures 1.0 without performing some work. Async await syntax was recently stabilized what we'll really do is to stub out a Reactor, and Executor and implement","breadcrumbs":"Why is Futures in Rust hard to understand","id":"4","title":"Why is Futures in Rust hard to understand"},"5":{"body":"Before we start implementing our Futures , we'll go through some background information that will help demystify some of the concepts we encounter.","breadcrumbs":"Some background information","id":"5","title":"Some background information"},"6":{"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","breadcrumbs":"Concurrency in general","id":"6","title":"Concurrency in general"},"7":{"body":"The single most confusing topic we encounter when implementing our own Futures is how we implement a Waker . Creating a Waker involves creating a vtable which allows using 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 this article: https://alschwalm.com/blog/static/2017/03/07/exploring-dynamic-dispatch-in-rust/ Let's explain this a bit more in detail.","breadcrumbs":"Trait objects and dynamic dispatch","id":"7","title":"Trait objects and dynamic dispatch"},"8":{"body":"Let's take a look at the size of some different pointer types in Rust. If we run the following code: # use std::mem::size_of;\ntrait SomeTrait { } fn main() { println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &i32: {}\", size_of::<&i32>()); println!(\"Size of &Box: {}\", size_of::<&Box>()); println!(\"Size of Box: {}\", size_of::>()); println!(\"Size of &dyn Trait: {}\", size_of::<&dyn SomeTrait>()); println!(\"Size of &[i32]: {}\", size_of::<&[i32]>()); println!(\"Size of &[&dyn Trait]: {}\", size_of::<&[&dyn SomeTrait]>()); println!(\"Size of [i32; 10]: {}\", size_of::<[i32; 10]>()); println!(\"Size of [&dyn Trait; 10]: {}\", size_of::<[&dyn SomeTrait; 10]>());\n} As you see from the output after running this, the sizes of the references varies. Most 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 more extra information. In the case of &[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. The one we'll concern ourselves about is the references to traits, or trait objects as they're called in Rust. &dyn SomeTrait is an example of 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 allow this we use dynamic dispatch. Let's explain this in code instead of words by implementing our own trait object from these parts: // 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. // Try changing the order of add and sub and see what happens. add as usize, // function pointer sub as usize, // function pointer mul as usize, // function pointer ]; let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; let test = unsafe { std::mem::transmute::(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} If you run this code by pressing the \"play\" button at the top you'll se it outputs just what we expect. This code example is editable so you can change it and run it to see what happens. The reason we go through this will be clear later on when we implement our own Waker we'll actually set up a vtable like we do here to and knowing what it is will make this much less mysterious.","breadcrumbs":"Fat pointers in Rust","id":"8","title":"Fat pointers in Rust"},"9":{"body":"If you don't know what this is, you should take a few minutes and read about it. You will encounter the term Reactor and Executor a lot when working with async code in Rust. I have written a quick introduction explaining this pattern before which you can take a look at here: homepage Epoll, Kqueue and IOCP Explained - The Reactor-Executor Pattern I'll re-iterate the most important parts here. This pattern consists of at least 2 parts: A reactor handles some kind of event queue has the responsibility of respoonding to events An executor Often has a scheduler Holds a set of suspended tasks, and has the responsibility of resuming them when an event has occurred The concept of a task A set of operations that can be stopped half way and resumed later on This is a pattern not only used in Rust, but it's very popular in Rust due to how well it separates concerns between handling and scheduling tasks, and queing and responding to I/O events. The only thing Rust as a language defines is the task . In Rust we call an incorruptible task a Future. Futures has a well defined interface, which means they can be used across the entire ecosystem. In addition, Rust provides a way for the Reactor and Executor to communicate through the Waker. We'll get to know these in the following chapters. Providing these pieces let's Rust take care a lot of the ergonomic \"friction\" programmers meet when faced with async code, and still not dictate any preferred runtime to actually do the scheduling and I/O queues. It's important to know that Rust doesn't provide a runtime, so you have to choose one. async std and tokio are two popular ones. 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\ No newline at end of file diff --git a/src/0_1_1_trait_objects.md b/src/0_1_1_trait_objects.md new file mode 100644 index 0000000..f9bd850 --- /dev/null +++ b/src/0_1_1_trait_objects.md @@ -0,0 +1,196 @@ +# Trait objects and fat pointers + +## Trait objects and dynamic dispatch + +The single most confusing topic we encounter when implementing our own `Futures` +is how we implement a `Waker` . Creating a `Waker` involves creating a `vtable` +which allows using 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 this article: + +https://alschwalm.com/blog/static/2017/03/07/exploring-dynamic-dispatch-in-rust/ + +Let's explain this a bit more in detail. + +## Fat pointers in Rust + +Let's take a look at the size of some different pointer types in Rust. If we +run the following code: + +``` rust +# use std::mem::size_of; +trait SomeTrait { } + +fn main() { + println!("Size of Box: {}", size_of::>()); + println!("Size of &i32: {}", size_of::<&i32>()); + println!("Size of &Box: {}", size_of::<&Box>()); + println!("Size of Box: {}", size_of::>()); + println!("Size of &dyn Trait: {}", size_of::<&dyn SomeTrait>()); + println!("Size of &[i32]: {}", size_of::<&[i32]>()); + println!("Size of &[&dyn Trait]: {}", size_of::<&[&dyn SomeTrait]>()); + println!("Size of [i32; 10]: {}", size_of::<[i32; 10]>()); + println!("Size of [&dyn Trait; 10]: {}", size_of::<[&dyn SomeTrait; 10]>()); +} +``` + +As you see from the output after running this, the sizes of the references varies. +Most 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 more extra +information. + +**In the case of `&[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. + +The one we'll concern ourselves about is the references to traits, or +_trait objects_ as they're called in Rust. + +`&dyn SomeTrait` is an example of 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 allow this we use +dynamic dispatch. + +Let's explain this in code instead of words by implementing our own trait +object from these parts: + +``` rust +// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr) +trait Test { + fn add(&self) -> i32; + fn sub(&self) -> i32; + fn mul(&self) -> i32; +} + +// This will represent our home brewn fat pointer to a trait object +#[repr(C)] +struct 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, +} + +// This is the data in our trait object. It's just two numbers we want to operate on. +struct Data { + a: i32, + b: i32, +} + +// ====== function definitions ====== +fn add(s: &Data) -> i32 { + s.a + s.b +} +fn sub(s: &Data) -> i32 { + s.a - s.b +} +fn mul(s: &Data) -> i32 { + s.a * s.b +} + +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. + // Try changing the order of add and sub and see what happens. + add as usize, // function pointer + sub as usize, // function pointer + mul as usize, // function pointer + ]; + + let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; + let test = unsafe { std::mem::transmute::(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()); +} + +``` + +If you run this code by pressing the "play" button at the top you'll se it +outputs just what we expect. + +This code example is editable so you can change it +and run it to see what happens. + +The reason we go through this will be clear later on when we implement our own +`Waker` we'll actually set up a `vtable` like we do here to and knowing what +it is will make this much less mysterious. + +## Reactor/Executor pattern + +If you don't know what this is, you should take a few minutes and read about +it. You will encounter the term `Reactor` and `Executor` a lot when working +with async code in Rust. + +I have written a quick introduction explaining this pattern before which you +can take a look at here: + + +[![homepage][1]][2] + + + +I'll re-iterate the most important parts here. + +This pattern consists of at least 2 parts: + +1. A reactor + - handles some kind of event queue + - has the responsibility of respoonding to events +2. An executor + - Often has a scheduler + - Holds a set of suspended tasks, and has the responsibility of resuming + them when an event has occurred +3. The concept of a task + - A set of operations that can be stopped half way and resumed later on + +This is a pattern not only used in Rust, but it's very popular in Rust due to +how well it separates concerns between handling and scheduling tasks, and queing +and responding to I/O events. + +The only thing Rust as a language defines is the _task_. In Rust we call an +incorruptible task a `Future`. Futures has a well defined interface, which means +they can be used across the entire ecosystem. + +In addition, Rust provides a way for the Reactor and Executor to communicate +through the `Waker`. We'll get to know these in the following chapters. + +Providing these pieces let's Rust take care a lot of the ergonomic "friction" +programmers meet when faced with async code, and still not dictate any +preferred runtime to actually do the scheduling and I/O queues. + +It's important to know that Rust doesn't provide a runtime, so you have to choose +one. [async std](https://github.com/async-rs/async-std) and [tokio](https://github.com/tokio-rs/tokio) are two popular ones. + +With that out of the way, let's move on to our main example. + + + + +[1]: ./assets/reactorexecutor.png +[2]: https://cfsamsonbooks.gitbook.io/epoll-kqueue-iocp-explained/appendix-1/reactor-executor-pattern \ No newline at end of file diff --git a/src/0_1_2_generators_pin.md b/src/0_1_2_generators_pin.md new file mode 100644 index 0000000..0db0b23 --- /dev/null +++ b/src/0_1_2_generators_pin.md @@ -0,0 +1,28 @@ +# Generators and Pin + +So the second difficult part that there seems to be a lot of questions about +is Generators and the `Pin` type. + +## Generators + +``` +**Relevant for:** + +- Understanding how the async/await syntax works +- Why we need `Pin` +- Why Rusts async model is extremely 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 +async/await as it does about generators). + +Basically, there were three main options that were discussed when Rust was +desiging how the language would handle concurrency: + +1. Stackfull coroutines, better known as green threads. +2. Using combinators. +3. Stackless coroutines, better known as generators. + + +[rfc2033]: https://github.com/rust-lang/rfcs/blob/master/text/2033-experimental-coroutines.md \ No newline at end of file diff --git a/src/0_1_background_information.md b/src/0_1_background_information.md index c65cc25..9166a45 100644 --- a/src/0_1_background_information.md +++ b/src/0_1_background_information.md @@ -15,197 +15,3 @@ try to give a high level overview that will make it easier to learn Rusts * [Async Basics - Strategies for handling I/O](https://cfsamson.github.io/book-exploring-async-basics/5_strategies_for_handling_io.html) * [Async Basics - Epoll, Kqueue and IOCP](https://cfsamson.github.io/book-exploring-async-basics/6_epoll_kqueue_iocp.html) -## Trait objects and dynamic dispatch - -The single most confusing topic we encounter when implementing our own `Futures` -is how we implement a `Waker` . Creating a `Waker` involves creating a `vtable` -which allows using 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 this article: - -https://alschwalm.com/blog/static/2017/03/07/exploring-dynamic-dispatch-in-rust/ - -Let's explain this a bit more in detail. - -## Fat pointers in Rust - -Let's take a look at the size of some different pointer types in Rust. If we -run the following code: - -``` rust -# use std::mem::size_of; -trait SomeTrait { } - -fn main() { - println!("Size of Box: {}", size_of::>()); - println!("Size of &i32: {}", size_of::<&i32>()); - println!("Size of &Box: {}", size_of::<&Box>()); - println!("Size of Box: {}", size_of::>()); - println!("Size of &dyn Trait: {}", size_of::<&dyn SomeTrait>()); - println!("Size of &[i32]: {}", size_of::<&[i32]>()); - println!("Size of &[&dyn Trait]: {}", size_of::<&[&dyn SomeTrait]>()); - println!("Size of [i32; 10]: {}", size_of::<[i32; 10]>()); - println!("Size of [&dyn Trait; 10]: {}", size_of::<[&dyn SomeTrait; 10]>()); -} -``` - -As you see from the output after running this, the sizes of the references varies. -Most 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 more extra -information. - -**In the case of `&[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. - -The one we'll concern ourselves about is the references to traits, or -_trait objects_ as they're called in Rust. - -`&dyn SomeTrait` is an example of 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 allow this we use -dynamic dispatch. - -Let's explain this in code instead of words by implementing our own trait -object from these parts: - -``` rust -// A reference to a trait object is a fat pointer: (data_ptr, vtable_ptr) -trait Test { - fn add(&self) -> i32; - fn sub(&self) -> i32; - fn mul(&self) -> i32; -} - -// This will represent our home brewn fat pointer to a trait object -#[repr(C)] -struct 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, -} - -// This is the data in our trait object. It's just two numbers we want to operate on. -struct Data { - a: i32, - b: i32, -} - -// ====== function definitions ====== -fn add(s: &Data) -> i32 { - s.a + s.b -} -fn sub(s: &Data) -> i32 { - s.a - s.b -} -fn mul(s: &Data) -> i32 { - s.a * s.b -} - -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. - // Try changing the order of add and sub and see what happens. - add as usize, // function pointer - sub as usize, // function pointer - mul as usize, // function pointer - ]; - - let fat_pointer = FatPointer { data: &mut data, vtable: vtable.as_ptr()}; - let test = unsafe { std::mem::transmute::(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()); -} - -``` - -If you run this code by pressing the "play" button at the top you'll se it -outputs just what we expect. - -This code example is editable so you can change it -and run it to see what happens. - -The reason we go through this will be clear later on when we implement our own -`Waker` we'll actually set up a `vtable` like we do here to and knowing what -it is will make this much less mysterious. - -## Reactor/Executor pattern - -If you don't know what this is, you should take a few minutes and read about -it. You will encounter the term `Reactor` and `Executor` a lot when working -with async code in Rust. - -I have written a quick introduction explaining this pattern before which you -can take a look at here: - - -[![homepage][1]][2] - - - -I'll re-iterate the most important parts here. - -This pattern consists of at least 2 parts: - -1. A reactor - - handles some kind of event queue - - has the responsibility of respoonding to events -2. An executor - - Often has a scheduler - - Holds a set of suspended tasks, and has the responsibility of resuming - them when an event has occurred -3. The concept of a task - - A set of operations that can be stopped half way and resumed later on - -This is a pattern not only used in Rust, but it's very popular in Rust due to -how well it separates concerns between handling and scheduling tasks, and queing -and responding to I/O events. - -The only thing Rust as a language defines is the _task_. In Rust we call an -incorruptible task a `Future`. Futures has a well defined interface, which means -they can be used across the entire ecosystem. - -In addition, Rust provides a way for the Reactor and Executor to communicate -through the `Waker`. We'll get to know these in the following chapters. - -Providing these pieces let's Rust take care a lot of the ergonomic "friction" -programmers meet when faced with async code, and still not dictate any -preferred runtime to actually do the scheduling and I/O queues. - -It's important to know that Rust doesn't provide a runtime, so you have to choose -one. [async std](https://github.com/async-rs/async-std) and [tokio](https://github.com/tokio-rs/tokio) are two popular ones. - -With that out of the way, let's move on to our main example. - - - - -[1]: ./assets/reactorexecutor.png -[2]: https://cfsamsonbooks.gitbook.io/epoll-kqueue-iocp-explained/appendix-1/reactor-executor-pattern \ No newline at end of file diff --git a/src/SUMMARY.md b/src/SUMMARY.md index 73a9fea..560f036 100644 --- a/src/SUMMARY.md +++ b/src/SUMMARY.md @@ -2,6 +2,8 @@ - [Introduction](./0_0_introduction.md) - [Some background information](./0_1_background_information.md) + - [Trait objects and fat pointers](./0_1_1_trait_objects.md) + - [Generators and Pin](./0_1_2_generators_pin.md) - [Naive example](./0_2_naive_implementation.md) - [Proper Waker](./0_3_proper_waker.md) - [Proper Future](0_4_proper_future.md)