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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` 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<i32>);
impl Future for Fut {
type Output = Out;
fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> {
$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<i32>, 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<i32>);
impl Drop for Guard {
fn drop(&mut self) {
$drop.fetch_add(1, Ordering::SeqCst);
}
}
let guard = Guard(Box::new(0));
move |runnable: Runnable| {
&guard;
runnable.schedule();
$sched.fetch_add(1, Ordering::SeqCst);
}
};
};
}
fn ms(ms: u64) -> Duration {
Duration::from_millis(ms)
}
#[test]
fn run_and_cancel() {
future!(f, POLL, DROP_F, DROP_T);
schedule!(s, SCHEDULE, DROP_S);
let (runnable, task) = async_task::spawn(f, s);
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_T.load(Ordering::SeqCst), 0);
assert_eq!(DROP_S.load(Ordering::SeqCst), 0);
assert!(future::block_on(task.cancel()).is_some());
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);
assert_eq!(DROP_S.load(Ordering::SeqCst), 1);
}
#[test]
fn cancel_and_run() {
future!(f, POLL, DROP_F, DROP_T);
schedule!(s, SCHEDULE, DROP_S);
let (runnable, task) = async_task::spawn(f, s);
Parallel::new()
.add(|| {
thread::sleep(ms(200));
runnable.run();
assert_eq!(POLL.load(Ordering::SeqCst), 0);
assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0);
assert_eq!(DROP_F.load(Ordering::SeqCst), 1);
assert_eq!(DROP_T.load(Ordering::SeqCst), 0);
thread::sleep(ms(200));
assert_eq!(DROP_S.load(Ordering::SeqCst), 1);
})
.add(|| {
assert!(future::block_on(task.cancel()).is_none());
thread::sleep(ms(200));
assert_eq!(POLL.load(Ordering::SeqCst), 0);
assert_eq!(SCHEDULE.load(Ordering::SeqCst), 0);
assert_eq!(DROP_F.load(Ordering::SeqCst), 1);
assert_eq!(DROP_T.load(Ordering::SeqCst), 0);
thread::sleep(ms(200));
assert_eq!(DROP_S.load(Ordering::SeqCst), 1);
})
.run();
}
#[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();
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), 1);
assert_eq!(DROP_T.load(Ordering::SeqCst), 1);
assert_eq!(DROP_S.load(Ordering::SeqCst), 1);
})
.add(|| {
thread::sleep(ms(200));
assert!(future::block_on(task.cancel()).is_none());
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);
assert_eq!(DROP_S.load(Ordering::SeqCst), 1);
})
.run();
}
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