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bug: dead lock in condvar example #6

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Merged
tyrchen merged 1 commit into from
Feb 5, 2022
Merged

bug: dead lock in condvar example #6

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12 changes: 10 additions & 2 deletions 33_concurrency/examples/condvar.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,13 @@ fn main() {

thread::spawn(move || {
let (lock, cvar) = &*pair2;
let mut started = lock.lock().unwrap();
*started = true;

// 通过离开作用域来释放锁，否则主线程会一直阻塞在获取锁上
{
let mut started = lock.lock().unwrap();
*started = true;
}
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@Ma233 Ma233 Jan 30, 2022

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此处也可以使用 drop(started);


eprintln!("I'm a happy worker!");
// 通知主线程
cvar.notify_one();
Expand All @@ -27,4 +32,7 @@ fn main() {
started = cvar.wait(started).unwrap();
}
eprintln!("Worker started!");

// 等待 worker 线程
thread::sleep(Duration::from_secs(3600));
}