Using events - a signal is set as soon as the asynchronous call is finished.

l利用事件——当异步调用完成时设定的信号。

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Due to the asynchronous nature of signals, it is difficult to point out the bug caused when a signal-handling function triggers a non-reentrant function.

由于信号在本质上是异步的，所以难以找出当信号处理函数触发某个不可重入函数时导致的bug。

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Using events - a signal is set as soon as the asynchronous call is finished.

利用事件-信号是尽快将异步调用完成。

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