This function provides a clean process shutdown.
这个函数能够干净地停止进程。
When file systems are unmounted as part of a system shutdown, they are marked as CLEAN.
在系统关闭期间卸载文件系统时，把它们标为clean。
In the event of a sudden system shutdown or panic, the MUI may have trouble starting when booting up because the MUI doesn't have the proper time to clean up leftover lock files when a system fails.
如果发生系统突然关机或panic, MUI可能在启动时很难打开，因为系统崩溃时MUI没有适当的时间来清除剩余的锁文件。
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