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fix scheduler loop

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This now matches more closely the logic as implemented in #631, and fixes the performance regression as far as I have observed.

Closes #746
This commit is contained in:
dignifiedquire 2020-04-09 17:02:27 +02:00
parent fc4e472599
commit 0c9a66c1f6
1 changed files with 8 additions and 6 deletions
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14
src/rt/runtime.rs
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@ -249,6 +249,8 @@ impl Machine {
continue;
}
let mut sched = rt.sched.lock().unwrap();
// One final check for available tasks while the scheduler is locked.
if let Some(task) = iter::repeat_with(|| self.find_task(rt))
.find(|s| !s.is_retry())
@ -258,19 +260,19 @@ impl Machine {
continue;
}
let mut sched = rt.sched.lock().unwrap();
// If another thread is already blocked on the reactor, there is no point in keeping
// the current thread around since there is too little work to do.
if sched.polling {
thread::sleep(Duration::from_micros(10));
continue;
break;
}
// Unlock the schedule poll the reactor until new I/O events arrive.
sched.polling = true;
drop(sched);
rt.reactor.poll(None).unwrap();
let mut sched = rt.sched.lock().unwrap();
// Lock the scheduler again and re-register the machine.
sched = rt.sched.lock().unwrap();
sched.polling = false;
runs = 0;