1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
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]
fn wait_and_drop() {
let wg = WaitGroup::new();
let wg2 = WaitGroup::new();
let (tx, rx) = mpsc::channel();
for _ in 0..THREADS {
let wg = wg.clone();
let wg2 = wg2.clone();
let tx = tx.clone();
thread::spawn(move || {
wg2.wait();
tx.send(()).unwrap();
drop(wg);
});
}
// At this point, no thread has gotten past `wg2.wait()`, so we shouldn't get anything from the
// channel.
assert!(rx.try_recv().is_err());
drop(wg2);
wg.wait();
// Now, the wait group is cleared and we should receive messages.
for _ in 0..THREADS {
rx.try_recv().unwrap();
}
}
|
