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。
2
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。
3
Using events - a signal is set as soon as the asynchronous call is finished.