博客介绍了struct sigevent元素，它用于指定操作终止时调用进程的通知方式。若sigev_notify为SIGEV_NONE则不通知；为SIGEV_SIGNAL则发送sigev_signo确定的信号；为SIGEV_THREAD则创建线程执行sigev_notify_function指向的函数。
struct sigevent:
This element specifies how the calling process is notified once the operation terminates. If the `sigev_notify' element is `SIGEV_NONE', no notification is sent. If it is
`SIGEV_SIGNAL', the signal determined by `sigev_signo' is sent. Otherwise, `sigev_notify' must be `SIGEV_THREAD'. In this case, a thread is created which starts executing the function pointed to by `sigev_notify_function'.
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