CPU是否浪费等待键盘输入？ （通用） [英] Is the CPU wasted waiting for keyboard input? (generic)

问题描述

如果操作系统不需要等待键盘（或其他输入设备）的输入，并且有任何操作系统正在使用该操作，那么我就会徘徊。我无法相信我们确实需要浪费自行车才能等待输入，为什么一旦按下输入按钮就不会让机器等待操作。

长话短说：

当前如何处理键盘输入 - 轮询或中断？

解决方案

大多数现代程序都不会像您所描述的那样在循环中获得输入。您可以使用事件处理或中断避免浪费周期。

I was wandering if there's a way in which the OS doesn't need to cycle ad infinitum waiting for the input from keyboard (or other input device) and if there are any OS using that. I can't believe that we do need to waste cycling just to wait for input, why can't the input do something once is pressed instead of having the machine to wait for the action.

Long story short:

How keyboard input is currently handled - polling or interrupts?

解决方案

Most modern programs don't get input in a loop as you describe. You can use event handling or interrupts to avoid wasted cycles.

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