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use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::mpsc::channel;
use std::sync::{Arc, Condvar, Mutex};
use std::thread;
use std::time::Duration;
#[test]
fn smoke() {
let c = Condvar::new();
c.notify_one();
c.notify_all();
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
fn notify_one() {
let m = Arc::new(Mutex::new(()));
let m2 = m.clone();
let c = Arc::new(Condvar::new());
let c2 = c.clone();
let g = m.lock().unwrap();
let _t = thread::spawn(move || {
let _g = m2.lock().unwrap();
c2.notify_one();
});
let g = c.wait(g).unwrap();
drop(g);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
fn notify_all() {
const N: usize = 10;
let data = Arc::new((Mutex::new(0), Condvar::new()));
let (tx, rx) = channel();
for _ in 0..N {
let data = data.clone();
let tx = tx.clone();
thread::spawn(move || {
let &(ref lock, ref cond) = &*data;
let mut cnt = lock.lock().unwrap();
*cnt += 1;
if *cnt == N {
tx.send(()).unwrap();
}
while *cnt != 0 {
cnt = cond.wait(cnt).unwrap();
}
tx.send(()).unwrap();
});
}
drop(tx);
let &(ref lock, ref cond) = &*data;
rx.recv().unwrap();
let mut cnt = lock.lock().unwrap();
*cnt = 0;
cond.notify_all();
drop(cnt);
for _ in 0..N {
rx.recv().unwrap();
}
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
fn wait_while() {
let pair = Arc::new((Mutex::new(false), Condvar::new()));
let pair2 = pair.clone();
// Inside of our lock, spawn a new thread, and then wait for it to start.
thread::spawn(move || {
let &(ref lock, ref cvar) = &*pair2;
let mut started = lock.lock().unwrap();
*started = true;
// We notify the condvar that the value has changed.
cvar.notify_one();
});
// Wait for the thread to start up.
let &(ref lock, ref cvar) = &*pair;
let guard = cvar.wait_while(lock.lock().unwrap(), |started| !*started);
assert!(*guard.unwrap());
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
fn wait_timeout_wait() {
let m = Arc::new(Mutex::new(()));
let c = Arc::new(Condvar::new());
loop {
let g = m.lock().unwrap();
let (_g, no_timeout) = c.wait_timeout(g, Duration::from_millis(1)).unwrap();
// spurious wakeups mean this isn't necessarily true
// so execute test again, if not timeout
if !no_timeout.timed_out() {
continue;
}
break;
}
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
fn wait_timeout_while_wait() {
let m = Arc::new(Mutex::new(()));
let c = Arc::new(Condvar::new());
let g = m.lock().unwrap();
let (_g, wait) = c.wait_timeout_while(g, Duration::from_millis(1), |_| true).unwrap();
// no spurious wakeups. ensure it timed-out
assert!(wait.timed_out());
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
fn wait_timeout_while_instant_satisfy() {
let m = Arc::new(Mutex::new(()));
let c = Arc::new(Condvar::new());
let g = m.lock().unwrap();
let (_g, wait) = c.wait_timeout_while(g, Duration::from_millis(0), |_| false).unwrap();
// ensure it didn't time-out even if we were not given any time.
assert!(!wait.timed_out());
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
fn wait_timeout_while_wake() {
let pair = Arc::new((Mutex::new(false), Condvar::new()));
let pair_copy = pair.clone();
let &(ref m, ref c) = &*pair;
let g = m.lock().unwrap();
let _t = thread::spawn(move || {
let &(ref lock, ref cvar) = &*pair_copy;
let mut started = lock.lock().unwrap();
thread::sleep(Duration::from_millis(1));
*started = true;
cvar.notify_one();
});
let (g2, wait) = c
.wait_timeout_while(g, Duration::from_millis(u64::MAX), |&mut notified| !notified)
.unwrap();
// ensure it didn't time-out even if we were not given any time.
assert!(!wait.timed_out());
assert!(*g2);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
fn wait_timeout_wake() {
let m = Arc::new(Mutex::new(()));
let c = Arc::new(Condvar::new());
loop {
let g = m.lock().unwrap();
let c2 = c.clone();
let m2 = m.clone();
let notified = Arc::new(AtomicBool::new(false));
let notified_copy = notified.clone();
let t = thread::spawn(move || {
let _g = m2.lock().unwrap();
thread::sleep(Duration::from_millis(1));
notified_copy.store(true, Ordering::Relaxed);
c2.notify_one();
});
let (g, timeout_res) = c.wait_timeout(g, Duration::from_millis(u64::MAX)).unwrap();
assert!(!timeout_res.timed_out());
// spurious wakeups mean this isn't necessarily true
// so execute test again, if not notified
if !notified.load(Ordering::Relaxed) {
t.join().unwrap();
continue;
}
drop(g);
t.join().unwrap();
break;
}
}
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