调用Thread.sleep（）方法在.NET锁语句中 [英] Calling Thread.Sleep() inside lock statement in .net

问题描述

我在想，如果一个电话就已经acquiered监视器将临睡前释放锁的线程Threa.Sleep：

I was wondering if a call to Threa.Sleep on a thread that already acquiered a Monitor will release the lock before going to sleep:

object o = new object();
Montior.Enter(o);
Thread.Sleep(1000);
Monitor.Exit(o);

当线程被挂起 - 可以在其它线程获取 0 ？

推荐答案

没有，锁也不会，如果你睡觉时释放出来。

No, the lock will not be released if you Sleep.

如果您希望以释放它，使用 Monitor.Wait（邻，超时）;此外，您还可以使用这个从另一个线程的信号 - 另一个线程可以使用 Monitor.Pulse [全部] （按住锁），早于唤醒等待线程 。超时（它会重新收购的过程中锁，太）

If you want to release it, use Monitor.Wait(o, timeout); further, you can also use this to signal from another thread - another thread can use Monitor.Pulse[All] (while holding the lock) to wake the waiting thread earlier than "timeout" (it will re-acquire the lock in the process, too).

请注意：只要使用进入/退出，你应该考虑使用try /终于过 - 或。如果有异常情况发生，你的风险没有释放锁

Note that whenever using Enter/Exit, you should consider using try/finally too - or you risk not releasing the lock if an exception happens.

例如：

bool haveLock = false;
try {
    Monitor.Enter(ref haveLock);
     // important: Wait releases, waits, and re-acquires the lock
    bool wokeEarly = Monitor.Wait(o, timeout);
    if(wokeEarly) {...}
} finally {
    if(haveLock) Monitor.Exit(o);
}

另一个线程可以这样做：

Another thread could do:

lock(o) { Monitor.PulseAll(o); }

这将目前微调的线程在对象上的等待（但什么都不做，如果没有对象是醒来）。强调：等待线程仍然必须等待脉冲的线程释放锁，因为它需要重新获取

Which will nudge any threads currently in a Wait on that object (but does nothing if no objects were waking). Emphasis: the waiting thread still has to wait for the pulsing thread to release the lock, since it needs to re-acquire.

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