这个互斥锁的状态立即去掉标记，其他等待的线程被阻止。
The state of the mutex is immediately reset to not signaled so any other waiting threads remain blocked.
当这个线程完成了，它必须改变互斥锁为标记状态，以便其他的进程可以访问这些资源。
When the thread is finished with the resource, it must set the state of the mutex to signaled to allow other threads to access the resource.
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