什么是忙循环？ [英] What is a busy loop?

问题描述

它可能是一个有或没有语句的循环吗？

Can it be a loop with or without statements?

while (1)
{
   //Empty
}

OR

int i = 0;

while (1)
{
   i++;
}

推荐答案

忙循环或更常见的是，繁忙等待是一种主动轮询，在该轮询中，应用程序正在等待某个事件的发生，并不断对其进行检查。通常，这包括定时睡眠或其他会浪费CPU时间的任务，以便另一个进程可以提供预期的输入。

A "busy loop" or more commonly "busy wait" is an active polling where the application is waiting on some event to occur and continuously checks for it. Typically this includes a timed sleep or other task which gives up CPU time so that another process can provide the expected input.

将此与回调进行对比。在等待回调时，程序不占用任何CPU周期。通常，程序会注册一个回调例程，某些监视应用程序会根据某些事件调用该回调例程。

Contrast this with a callback. While waiting on a callback, the program consumes no CPU cycles. Typically the program will "register" a callback routine which some monitoring application invokes based on some event.

区别在于，繁忙循环中的程序会占用CPU和时间。回调机制允许程序在等待时不消耗（或几乎不消耗）CPU。

The distinction is that the program in a busy-loop consumes CPU and time slices while waiting while the callback mechanism allows a program to consume no (or almost no) CPU while waiting.

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