WaitForSingleObject - 线程等待队列吗？ [英] WaitForSingleObject - do threads waiting form a queue?

问题描述

如果我设置3个线程等待互斥体释放，它们根据他们请求的顺序形成一个队列，或者它是未定义的行为（即我们不知道哪一个会首先拾取它） ？

If I set 3 threads to wait for a mutex to be release, do they form a queue based on the order they requested it in or is it undefined behaviour (i.e. we don't know which one will pick it up first)?

推荐答案

它在 SDK文章：

如果多个线程正在等待互斥量，选择等待线程。不要假定先进先出（FIFO）顺序。外部事件（如内核模式APC）可以更改等待顺序。

If more than one thread is waiting on a mutex, a waiting thread is selected. Do not assume a first-in, first-out (FIFO) order. External events such as kernel-mode APCs can change the wait order.

这些事件完全不受您的控制。因此，未定义的行为是描述它的适当方式。

These kind of events are entirely out of your control. So "undefined behavior" is an appropriate way to describe it.

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