... wake-up call 叫醒人的电话... wake-up waiting 唤醒等待 automatic wake-up service 闹钟服务, 自动叫醒...
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然而，要唤醒等待队列中所有睡眠的进程有时并不方便。
However, it is not always convenient to wake up all sleeping processes in a wait queue.
发信号：在 Win32 中，发出信号会唤醒等待那个信号的所有线程。
Signaling: In Win32, signaling a semaphore wakes up all the threads that are waiting on the semaphore.
例如，如果两个或多个进程正在等待互斥访问某一要释放的资源，仅唤醒等待队列中一个进程才有意义。
For instance, if two or more processes are waiting for exclusive access to some resource to be released, it makes sense to wake up just one process in the wait queue.
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