c++ - 使用 C++ 在多个互斥体上调用 WaitForMultipleObjects 并设置超时

Question

如果我打电话WaitForMultipleObjects在多个互斥体上，如下所示:

HANDLE hMutexes[5] = {...};   //All mutexes
DWORD dwRet = WaitForMultipleObjects(5, hMutexes, TRUE, 5 * 1000);

并且dwRet返回为WAIT_TIMEOUT，hMutexes数组中的互斥体将处于什么状态？或者，换句话说，我应该对其中任何一个调用 ReleaseMutex 吗？

Answer 1

WaitForMultipleObjects 函数的文档指出:

When bWaitAll is TRUE, ... the function does not modify the states of the specified objects until the states of all objects have been set to signaled. For example, a mutex can be signaled, but the thread does not get ownership until the states of the other objects are also set to signaled.

因此您无需担心这种情况。如果 WaitForMultipleObjects 返回 WAIT_TIMEOUT，则您不拥有任何互斥锁。如果它返回 WAIT_OBJECT_0，则您拥有所有这些。