"while(true){Thread.Sleep}"的原因是什么? [英] What is the reason for "while(true) { Thread.Sleep }"?

问题描述

我有时会遇到以下形式的代码:

I sometimes encounter code in the following form:

while (true) {
  //do something
  Thread.Sleep(1000);
}

我想知道这是好事还是坏事，是否还有其他选择.

I was wondering if this is considered good or bad practice and if there are any alternatives.

通常，我在服务的主要功能中找到"这样的代码.

Usually I "find" such code in the main-function of services.

我最近在Windows azure worker角色的运行"功能中看到了具有以下格式的代码:

I recently saw code in the "Run" function in a windows azure worker role which had the following form:

ClassXYZ xyz = new ClassXYZ(); //ClassXYZ creates separate Threads which execute code
while (true) {
  Thread.Sleep(1000);
}

我认为有更好的方法可以防止服务(或天蓝色工作人员角色)退出. 有人对我有建议吗?

I assume there are better ways to prevent a service (or azure worker role) from exiting. Does anyone have a suggestion for me?

推荐答案

使用Thread.Sleep(1000)执行此操作时，处理器将浪费很少的时间来唤醒并且不执行任何操作.

Well when you do that with Thread.Sleep(1000), your processor wastes a tiny amount of time to wake up and do nothing.

您可以使用 CancelationTokenSource 做类似的事情.

You could do something similar with CancelationTokenSource.

当您呼叫WaitOne()时，它将等待直到收到信号为止.

When you call WaitOne(), it will wait until it receives a signal.

CancellationTokenSource cancelSource = new CancellationTokenSource();

public override void Run()
{
    //do stuff
    cancelSource.Token.WaitHandle.WaitOne();
}

public override void OnStop()
{
    cancelSource.Cancel();
}

这将使Run()方法退出，而不会在忙于等待时浪费您的CPU时间.

This will keep the Run() method from exiting without wasting your CPU time on busy waiting.

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