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Merge pull request #1598 from Pauan/fix-futures

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Fixing panic if the Future wakes up after returning Poll::Ready
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Alex Crichton 2019-06-17 09:36:24 -05:00 committed by GitHub
commit b5da08c6a0
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1 changed files with 17 additions and 17 deletions
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34
crates/futures/src/futures_0_3.rs
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@ -233,27 +233,27 @@ where
match lock.pop_front() {
Some(task) => {
let mut future = task.future.borrow_mut();
let mut borrow = task.future.borrow_mut();
let poll = {
// This will only panic if the Future wakes up the Waker after returning Poll::Ready
let mut future = future.as_mut().unwrap_throw();
// This will only be None if the Future wakes up the Waker after returning Poll::Ready
if let Some(future) = borrow.as_mut() {
let poll = {
// Clear `is_queued` flag so that it will re-queue if poll calls waker.wake()
task.is_queued.set(false);
// Clear `is_queued` flag so that it will re-queue if poll calls waker.wake()
task.is_queued.set(false);
// This is necessary because the polled task might queue more tasks
drop(lock);
// This is necessary because the polled task might queue more tasks
drop(lock);
// TODO is there some way of saving these so they don't need to be recreated all the time ?
let waker = ArcWake::into_waker(task.clone());
let cx = &mut Context::from_waker(&waker);
Pin::new(future).poll(cx)
};
// TODO is there some way of saving these so they don't need to be recreated all the time ?
let waker = ArcWake::into_waker(task.clone());
let cx = &mut Context::from_waker(&waker);
Pin::new(&mut future).poll(cx)
};
if let Poll::Ready(_) = poll {
// Cleanup the Future immediately
*future = None;
if let Poll::Ready(_) = poll {
// Cleanup the Future immediately
*borrow = None;
}
}
},
None => {