轮询Polling)是一种CPU决策如何提供周边设备服务的方式,又称“程式控制输入输出”(Programmed I/O)。轮询法的概念是:由CPU定时发出询问,依序询问每一个周边设备是否需要其服务,有即给予服务,服务结束后再问下一个周边,接著不断周而复始。

轮询法实作容易,但效率偏低。

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