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use std::{task::Context, time::Duration};
#[cfg(not(loom))]
use futures::task::noop_waker_ref;
use crate::loom::sync::{Arc, Mutex};
use crate::loom::thread;
use crate::{
loom::sync::atomic::{AtomicBool, Ordering},
park::Unpark,
};
use super::{Handle, TimerEntry};
struct MockUnpark {}
impl Unpark for MockUnpark {
fn unpark(&self) {}
}
impl MockUnpark {
fn mock() -> Box<dyn Unpark> {
Box::new(Self {})
}
}
fn block_on<T>(f: impl std::future::Future<Output = T>) -> T {
#[cfg(loom)]
return loom::future::block_on(f);
#[cfg(not(loom))]
return futures::executor::block_on(f);
}
fn model(f: impl Fn() + Send + Sync + 'static) {
#[cfg(loom)]
loom::model(f);
#[cfg(not(loom))]
f();
}
#[test]
fn single_timer() {
model(|| {
let clock = crate::time::clock::Clock::new(true);
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source.clone(), MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let handle_ = handle.clone();
let jh = thread::spawn(move || {
let entry = TimerEntry::new(&handle_, clock.now() + Duration::from_secs(1));
pin!(entry);
block_on(futures::future::poll_fn(|cx| {
entry.as_mut().poll_elapsed(cx)
}))
.unwrap();
});
thread::yield_now();
// This may or may not return Some (depending on how it races with the
// thread). If it does return None, however, the timer should complete
// synchronously.
handle.process_at_time(time_source.now() + 2_000_000_000);
jh.join().unwrap();
})
}
#[test]
fn drop_timer() {
model(|| {
let clock = crate::time::clock::Clock::new(true);
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source.clone(), MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let handle_ = handle.clone();
let jh = thread::spawn(move || {
let entry = TimerEntry::new(&handle_, clock.now() + Duration::from_secs(1));
pin!(entry);
let _ = entry
.as_mut()
.poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref()));
let _ = entry
.as_mut()
.poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref()));
});
thread::yield_now();
// advance 2s in the future.
handle.process_at_time(time_source.now() + 2_000_000_000);
jh.join().unwrap();
})
}
#[test]
fn change_waker() {
model(|| {
let clock = crate::time::clock::Clock::new(true);
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source.clone(), MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let handle_ = handle.clone();
let jh = thread::spawn(move || {
let entry = TimerEntry::new(&handle_, clock.now() + Duration::from_secs(1));
pin!(entry);
let _ = entry
.as_mut()
.poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref()));
block_on(futures::future::poll_fn(|cx| {
entry.as_mut().poll_elapsed(cx)
}))
.unwrap();
});
thread::yield_now();
// advance 2s
handle.process_at_time(time_source.now() + 2_000_000_000);
jh.join().unwrap();
})
}
#[test]
fn reset_future() {
model(|| {
let finished_early = Arc::new(AtomicBool::new(false));
let clock = crate::time::clock::Clock::new(true);
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source.clone(), MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let handle_ = handle.clone();
let finished_early_ = finished_early.clone();
let start = clock.now();
let jh = thread::spawn(move || {
let entry = TimerEntry::new(&handle_, start + Duration::from_secs(1));
pin!(entry);
let _ = entry
.as_mut()
.poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref()));
entry.as_mut().reset(start + Duration::from_secs(2));
// shouldn't complete before 2s
block_on(futures::future::poll_fn(|cx| {
entry.as_mut().poll_elapsed(cx)
}))
.unwrap();
finished_early_.store(true, Ordering::Relaxed);
});
thread::yield_now();
// This may or may not return a wakeup time.
handle.process_at_time(time_source.instant_to_tick(start + Duration::from_millis(1500)));
assert!(!finished_early.load(Ordering::Relaxed));
handle.process_at_time(time_source.instant_to_tick(start + Duration::from_millis(2500)));
jh.join().unwrap();
assert!(finished_early.load(Ordering::Relaxed));
})
}
#[test]
#[cfg(not(loom))]
fn poll_process_levels() {
let clock = crate::time::clock::Clock::new(true);
clock.pause();
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source, MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let mut entries = vec![];
for i in 0..1024 {
let mut entry = Box::pin(TimerEntry::new(
&handle,
clock.now() + Duration::from_millis(i),
));
let _ = entry
.as_mut()
.poll_elapsed(&mut Context::from_waker(noop_waker_ref()));
entries.push(entry);
}
for t in 1..1024 {
handle.process_at_time(t as u64);
for (deadline, future) in entries.iter_mut().enumerate() {
let mut context = Context::from_waker(noop_waker_ref());
if deadline <= t {
assert!(future.as_mut().poll_elapsed(&mut context).is_ready());
} else {
assert!(future.as_mut().poll_elapsed(&mut context).is_pending());
}
}
}
}
#[test]
#[cfg(not(loom))]
fn poll_process_levels_targeted() {
let mut context = Context::from_waker(noop_waker_ref());
let clock = crate::time::clock::Clock::new(true);
clock.pause();
let time_source = super::ClockTime::new(clock.clone());
let inner = super::Inner::new(time_source, MockUnpark::mock());
let handle = Handle::new(Arc::new(Mutex::new(inner)));
let e1 = TimerEntry::new(&handle, clock.now() + Duration::from_millis(193));
pin!(e1);
handle.process_at_time(62);
assert!(e1.as_mut().poll_elapsed(&mut context).is_pending());
handle.process_at_time(192);
handle.process_at_time(192);
}
/*
#[test]
fn balanced_incr_and_decr() {
const OPS: usize = 5;
fn incr(inner: Arc<Inner>) {
for _ in 0..OPS {
inner.increment().expect("increment should not have failed");
thread::yield_now();
}
}
fn decr(inner: Arc<Inner>) {
let mut ops_performed = 0;
while ops_performed < OPS {
if inner.num(Ordering::Relaxed) > 0 {
ops_performed += 1;
inner.decrement();
}
thread::yield_now();
}
}
loom::model(|| {
let unpark = Box::new(MockUnpark);
let instant = Instant::now();
let inner = Arc::new(Inner::new(instant, unpark));
let incr_inner = inner.clone();
let decr_inner = inner.clone();
let incr_hndle = thread::spawn(move || incr(incr_inner));
let decr_hndle = thread::spawn(move || decr(decr_inner));
incr_hndle.join().expect("should never fail");
decr_hndle.join().expect("should never fail");
assert_eq!(inner.num(Ordering::SeqCst), 0);
})
}
*/
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