public-collect/books-futures-explained
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finished book!!!!!!

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This commit is contained in:
Carl Fredrik Samson
2020-04-06 01:51:18 +02:00
parent 3a3ad1eeea
commit 15d7c726f8
18 changed files with 720 additions and 1172 deletions
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17
book/8_finished_example.html
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@@ -193,9 +193,11 @@ fn 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);
// SAFETY: we shadow `future` so it can't be accessed again.
let mut future = unsafe { Pin::new_unchecked(&mut future) };
let val = loop {
let pinned = unsafe { Pin::new_unchecked(&mut future) };
match Future::poll(pinned, &mut cx) {
match Future::poll(future.as_mut(), &mut cx) {
Poll::Ready(val) => break val,
Poll::Pending => thread::park(),
};
@@ -203,15 +205,6 @@ fn block_on<F: Future>(mut future: F) -> F::Output {
val
}
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
}
// ====================== FUTURE IMPLEMENTATION ==============================
#[derive(Clone)]
struct MyWaker {
@@ -233,7 +226,7 @@ fn mywaker_wake(s: &MyWaker) {
}
fn mywaker_clone(s: &MyWaker) -> RawWaker {
let arc = unsafe { Arc::from_raw(s).clone() };
let arc = unsafe { Arc::from_raw(s) };
std::mem::forget(arc.clone()); // increase ref count
RawWaker::new(Arc::into_raw(arc) as *const (), &VTABLE)
}