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 easy_parallel::Parallel; use smol::future; // Creates a future with event counters. // // Usage: `future!(f, POLL, DROP_F, DROP_T)` // // The future `f` sleeps for 200 ms and outputs `Poll::Ready`. // When it gets polled, `POLL` is incremented. // When it gets dropped, `DROP_F` is incremented. // When the output gets dropped, `DROP_T` is incremented. macro_rules! future { ($name:pat, $poll:ident, $drop_f:ident, $drop_t:ident) => { static $poll: AtomicUsize = AtomicUsize::new(0); static $drop_f: AtomicUsize = AtomicUsize::new(0); static $drop_t: AtomicUsize = AtomicUsize::new(0); let $name = { struct Fut(Box); impl Future for Fut { type Output = Out; fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll { $poll.fetch_add(1, Ordering::SeqCst); thread::sleep(ms(400)); Poll::Ready(Out(Box::new(0), true)) } } impl Drop for Fut { fn drop(&mut self) { $drop_f.fetch_add(1, Ordering::SeqCst); } } #[derive(Default)] struct Out(Box, bool); impl Drop for Out { fn drop(&mut self) { if self.1 { $drop_t.fetch_add(1, Ordering::SeqCst); } } } Fut(Box::new(0)) }; }; } // Creates a schedule function with event counters. // // Usage: `schedule!(s, SCHED, DROP)` // // The schedule function `s` does nothing. // When it gets invoked, `SCHED` is incremented. // When it gets dropped, `DROP` is incremented. macro_rules! schedule { ($name:pat, $sched:ident, $drop:ident) => { static $drop: AtomicUsize = AtomicUsize::new(0); static $sched: AtomicUsize = AtomicUsize::new(0); let $name = { struct Guard(Box); impl Drop for Guard { fn drop(&mut self) { $drop.fetch_add(1, Ordering::SeqCst); } } let guard = Guard(Box::new(0)); move |_runnable: Runnable| { let _ = &guard; $sched.fetch_add(1, Ordering::SeqCst); } }; }; } fn ms(ms: u64) -> Duration { Duration::from_millis(ms) } #[test] fn cancel_during_run() { future!(f, POLL, DROP_F, DROP_T); schedule!(s, SCHEDULE, DROP_S); let (runnable, task) = async_task::spawn(f, s); Parallel::new() .add(|| { runnable.run(); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); assert_eq!(DROP_T.load(Ordering::SeqCst), 1); }) .add(|| { thread::sleep(ms(200)); 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!(DROP_T.load(Ordering::SeqCst), 0); drop(task); 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!(DROP_T.load(Ordering::SeqCst), 0); thread::sleep(ms(400)); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); assert_eq!(DROP_T.load(Ordering::SeqCst), 1); }) .run(); } #[test] fn join_during_run() { future!(f, POLL, DROP_F, DROP_T); schedule!(s, SCHEDULE, DROP_S); let (runnable, task) = async_task::spawn(f, s); Parallel::new() .add(|| { runnable.run(); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); thread::sleep(ms(200)); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); }) .add(|| { thread::sleep(ms(200)); future::block_on(task); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); assert_eq!(DROP_T.load(Ordering::SeqCst), 1); thread::sleep(ms(200)); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); }) .run(); } #[test] fn try_join_during_run() { future!(f, POLL, DROP_F, DROP_T); schedule!(s, SCHEDULE, DROP_S); let (runnable, mut task) = async_task::spawn(f, s); Parallel::new() .add(|| { runnable.run(); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); assert_eq!(DROP_T.load(Ordering::SeqCst), 1); }) .add(|| { thread::sleep(ms(200)); future::block_on(future::or(&mut task, future::ready(Default::default()))); 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!(DROP_T.load(Ordering::SeqCst), 0); drop(task); }) .run(); } #[test] fn detach_during_run() { future!(f, POLL, DROP_F, DROP_T); schedule!(s, SCHEDULE, DROP_S); let (runnable, task) = async_task::spawn(f, s); Parallel::new() .add(|| { runnable.run(); assert_eq!(POLL.load(Ordering::SeqCst), 1); assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0); assert_eq!(DROP_F.load(Ordering::SeqCst), 1); assert_eq!(DROP_S.load(Ordering::SeqCst), 1); assert_eq!(DROP_T.load(Ordering::SeqCst), 1); }) .add(|| { thread::sleep(ms(200)); 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!(DROP_T.load(Ordering::SeqCst), 0); }) .run(); }