If the list is empty, the number of waiting threads is incremented and the current thread is blocked.

如果列表为空，就会增加等待线程的数量，并阻塞当前线程。

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Tracking of the blocked calls is reflected as Log view, from which you can add number to allow list, call that number and send SMS to it.

跟踪被冻结的要求反映为登录查看，您可以添加一些允许清单，电话号码和发短信给它。

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