您可以通过以下方式打开日志记录，从而更清楚地了解事件的顺序
import multiprocessing as mp
logger = mp.log_to_stderr(logging.INFO)
在其他import语句之后。然后您的程序将产生如下内容：
[INFO/Process-1] child process calling self.run()
[INFO/MainProcess] process shutting down
Process-1 starting...
beep...
[INFO/Process-2] child process calling self.run()
[INFO/MainProcess] calling terminate() for daemon Process-1
Process-2 starting...
[INFO/MainProcess] calling join() for process Process-2
Process-2 ending...
[INFO/Process-2] process shutting down
[INFO/Process-2] process exiting with exitcode 0
[INFO/MainProcess] calling join() for process Process-1
因此，主程序首先开始关闭，然后终止进程1（守护进程）。这就是在继续Process-2时看不到蜂鸣声的原因。
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