如果另一个线程正在执行一个方法，则退出该方法 [英] Exit a method if another thread is executing it

问题描述

我在多线程应用程序中有一个方法，我希望在调用此方法时有以下行为:

I have a method in a multi-threaded application and I'd like the following behavior when this method is invoked:

1. 如果当前没有其他线程正在执行该方法，则执行它.
2. 如果另一个线程当前正在执行该方法，则退出该方法而不执行它.

C# 中的 lock 语句对于等待线程完成执行很有用，但我不想序列化对此方法的访问，而是绕过执行该方法(如果它正在被执行)另一个线程.

The lock statement in C# is useful for waiting until a thread has completed execution, but I don't want to serialize access to this method but rather bypass executing said method if it is being executed by another thread.

推荐答案

我想我不明白......如果一次只能由一个线程调用，为什么多个线程开始调用它?

I suppose I don't understand... if it should only be called by one thread at a time, why are multiple threads calling it to begin with?

无论如何，您可以使用 Monitor.TryEnter().如果无法获取锁，它不会阻塞并返回 false.在这种情况下，您可以直接从函数中返回.

Anyway, you can use Monitor.TryEnter(). It doesn't block and returns false if it fails to acquire a lock. In that case you can just return from the function.

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