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为何说内核监控反馈消息不会出现阻塞等待的情况？

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为何说内核监控反馈消息不会出现阻塞等待的情况？

对于信号（Signal），在应用层可以将消息传递给内核监控，当消息处理完毕后，内核将消息反馈给应用层，这样操作不会出现阻塞等待，保持信号处理的持续性。

1.为什么这样不会出现阻塞等待，保持信号处理的持续性？
2.这里的消息是什么？
3.消息的处理是操作系统处理还是指的应用在处理？


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