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libasync/executor: reduced reallocation for vector

This commit is contained in:
pca006132 2020-09-07 16:13:08 +08:00
parent ae244082ed
commit 4fef8a7192
1 changed files with 3 additions and 2 deletions
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5
libasync/src/executor.rs
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@ -72,6 +72,7 @@ impl Executor {
pin_mut!(f); pin_mut!(f);
let ready = AtomicBool::new(true); let ready = AtomicBool::new(true);
let waker = wrap_waker(&ready); let waker = wrap_waker(&ready);
let mut backup = Vec::new();
let val = loop { let val = loop {
// advance the main task // advance the main task
if ready.load(Ordering::Relaxed) { if ready.load(Ordering::Relaxed) {
@ -86,8 +87,8 @@ impl Executor {
} }
// advance all tasks // advance all tasks
let next_tasks = self.tasks.replace_with(|tasks| Vec::with_capacity(tasks.len())); core::mem::swap(&mut *self.tasks.borrow_mut(), &mut backup);
for mut task in next_tasks.into_iter() { for mut task in backup.drain(..) {
// NOTE we don't need a CAS operation here because `wake` invocations that come from // NOTE we don't need a CAS operation here because `wake` invocations that come from
// interrupt handlers (the only source of 'race conditions' (!= data races)) are // interrupt handlers (the only source of 'race conditions' (!= data races)) are
// "oneshot": they'll issue a `wake` and then disable themselves to not run again // "oneshot": they'll issue a `wake` and then disable themselves to not run again