If the specified time - out interval elapses, the thread enters the ready queue.
如果指定的 超时 间隔已过, 则线程进入就绪队列.
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If established, it continued to implement, so make repeat until ready queue is empty.
若成立, 就继续执行, 这样重复做下去,直到就绪队列为空.
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After the signal is sent, the waiting threads are moved to the ready queue.
发送信号后, 等待线程就被移动到就绪队列中.
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