临界段操作时坚持互斥锁(mutual exclusion)原则(当一个线程处于临界段中时，其他所有线程都不能进入临界段)。

Critical sections operate on the principle of mutual exclusion (when a thread is within a critical section, all other threads are excluded from entering).

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如果到超时时间段结束时还没有被唤醒，读线程需要唤醒自身并释放互斥锁。

If not awake otherwise, at the end of the timeout, the reader needs to wake itself up and release the mutex.

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如果到超时时间段结束时还没有被唤醒，读线程需要唤醒自身并释放互斥锁。

If not awake otherwise, at the end of the timeout, the reader needs to wake itself up and release the mutex.

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