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use std::sync::mpsc;
use std::thread;
use std::time::Duration;
use crossbeam_utils::sync::WaitGroup;
const THREADS: usize = 10;
#[test]
fn wait() {
let wg = WaitGroup::new();
let (tx, rx) = mpsc::channel();
for _ in 0..THREADS {
let wg = wg.clone();
let tx = tx.clone();
thread::spawn(move || {
wg.wait();
tx.send(()).unwrap();
});
}
thread::sleep(Duration::from_millis(100));
// At this point, all spawned threads should be blocked, so we shouldn't get anything from the
// channel.
assert!(rx.try_recv().is_err());
wg.wait();
// Now, the wait group is cleared and we should receive messages.
for _ in 0..THREADS {
rx.recv().unwrap();
}
}
#[test]
#[cfg_attr(miri, ignore)] // this test makes timing assumptions, but Miri is so slow it violates them
fn wait_and_drop() {
let wg = WaitGroup::new();
let (tx, rx) = mpsc::channel();
for _ in 0..THREADS {
let wg = wg.clone();
let tx = tx.clone();
thread::spawn(move || {
thread::sleep(Duration::from_millis(100));
tx.send(()).unwrap();
drop(wg);
});
}
// At this point, all spawned threads should be in `thread::sleep`, so we shouldn't get anything
// from the channel.
assert!(rx.try_recv().is_err());
wg.wait();
// Now, the wait group is cleared and we should receive messages.
for _ in 0..THREADS {
rx.try_recv().unwrap();
}
}
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