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Diffstat (limited to 'tests/waker_pending.rs')
| -rw-r--r-- | tests/waker_pending.rs | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/tests/waker_pending.rs b/tests/waker_pending.rs new file mode 100644 index 0000000..9c95cba --- /dev/null +++ b/tests/waker_pending.rs @@ -0,0 +1,365 @@ +use std::future::Future; +use std::pin::Pin; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::task::{Context, Poll}; +use std::thread; +use std::time::Duration; + +use async_task::Runnable; +use atomic_waker::AtomicWaker; +use easy_parallel::Parallel; + +// Creates a future with event counters. +// +// Usage: `future!(f, get_waker, POLL, DROP)` +// +// The future `f` always sleeps for 200 ms and returns `Poll::Pending`. +// When it gets polled, `POLL` is incremented. +// When it gets dropped, `DROP` is incremented. +// +// Every time the future is run, it stores the waker into a global variable. +// This waker can be extracted using the `get_waker()` function. +macro_rules! future { + ($name:pat, $get_waker:pat, $poll:ident, $drop:ident) => { + static $poll: AtomicUsize = AtomicUsize::new(0); + static $drop: AtomicUsize = AtomicUsize::new(0); + static WAKER: AtomicWaker = AtomicWaker::new(); + + let ($name, $get_waker) = { + struct Fut(Box<i32>); + + impl Future for Fut { + type Output = (); + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + WAKER.register(cx.waker()); + $poll.fetch_add(1, Ordering::SeqCst); + thread::sleep(ms(400)); + Poll::Pending + } + } + + impl Drop for Fut { + fn drop(&mut self) { + $drop.fetch_add(1, Ordering::SeqCst); + } + } + + (Fut(Box::new(0)), || WAKER.take().unwrap()) + }; + }; +} + +// Creates a schedule function with event counters. +// +// Usage: `schedule!(s, chan, SCHED, DROP)` +// +// The schedule function `s` pushes the task into `chan`. +// When it gets invoked, `SCHED` is incremented. +// When it gets dropped, `DROP` is incremented. +// +// Receiver `chan` extracts the task when it is scheduled. +macro_rules! schedule { + ($name:pat, $chan:pat, $sched:ident, $drop:ident) => { + static $drop: AtomicUsize = AtomicUsize::new(0); + static $sched: AtomicUsize = AtomicUsize::new(0); + + let ($name, $chan) = { + let (s, r) = flume::unbounded(); + + struct Guard(Box<i32>); + + impl Drop for Guard { + fn drop(&mut self) { + $drop.fetch_add(1, Ordering::SeqCst); + } + } + + let guard = Guard(Box::new(0)); + let sched = move |runnable: Runnable| { + let _ = &guard; + $sched.fetch_add(1, Ordering::SeqCst); + s.send(runnable).unwrap(); + }; + + (sched, r) + }; + }; +} + +fn ms(ms: u64) -> Duration { + Duration::from_millis(ms) +} + +#[test] +fn wake_during_run() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, _task) = async_task::spawn(f, s); + + runnable.run(); + let waker = get_waker(); + waker.wake_by_ref(); + let runnable = chan.recv().unwrap(); + + Parallel::new() + .add(|| { + runnable.run(); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 2); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 1); + }) + .add(|| { + thread::sleep(ms(200)); + + waker.wake_by_ref(); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + thread::sleep(ms(400)); + + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 2); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 1); + }) + .run(); + + chan.recv().unwrap(); + drop(get_waker()); +} + +#[test] +fn cancel_during_run() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + let waker = get_waker(); + waker.wake(); + let runnable = chan.recv().unwrap(); + + Parallel::new() + .add(|| { + runnable.run(); + drop(get_waker()); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .add(|| { + thread::sleep(ms(200)); + + drop(task); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + thread::sleep(ms(400)); + + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .run(); +} + +#[test] +fn wake_and_cancel_during_run() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + let waker = get_waker(); + waker.wake_by_ref(); + let runnable = chan.recv().unwrap(); + + Parallel::new() + .add(|| { + runnable.run(); + drop(get_waker()); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .add(|| { + thread::sleep(ms(200)); + + waker.wake(); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + drop(task); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + thread::sleep(ms(400)); + + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .run(); +} + +#[test] +fn cancel_and_wake_during_run() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + let waker = get_waker(); + waker.wake_by_ref(); + let runnable = chan.recv().unwrap(); + + Parallel::new() + .add(|| { + runnable.run(); + drop(get_waker()); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .add(|| { + thread::sleep(ms(200)); + + drop(task); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + waker.wake(); + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + thread::sleep(ms(400)); + + assert_eq!(POLL.load(Ordering::SeqCst), 2); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); + }) + .run(); +} + +#[test] +fn drop_last_waker() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + let waker = get_waker(); + + task.detach(); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + drop(waker); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 1); + + chan.recv().unwrap().run(); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); +} + +#[test] +fn cancel_last_task() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + drop(get_waker()); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + drop(task); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 1); + + chan.recv().unwrap().run(); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); +} + +#[test] +fn drop_last_task() { + future!(f, get_waker, POLL, DROP_F); + schedule!(s, chan, SCHEDULE, DROP_S); + let (runnable, task) = async_task::spawn(f, s); + + runnable.run(); + drop(get_waker()); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 0); + + task.detach(); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 0); + assert_eq!(DROP_S.load(Ordering::SeqCst), 0); + assert_eq!(chan.len(), 1); + + chan.recv().unwrap().run(); + assert_eq!(POLL.load(Ordering::SeqCst), 1); + assert_eq!(SCHEDULE.load(Ordering::SeqCst), 1); + assert_eq!(DROP_F.load(Ordering::SeqCst), 1); + assert_eq!(DROP_S.load(Ordering::SeqCst), 1); + assert_eq!(chan.len(), 0); +} |