.net thread.sleep 不准确

问题描述：

我快疯了！！我通过 gsm 和语音规范发送音频，我必须发送语音数据包，然后等待 20 毫秒才能获得正常语音.我使用 system.threading.thread.sleep(20).但是，我注意到声音很慢.但是当我运行另一个不同的应用程序时，声音变得正常.

I am getting crazy !!. I am sending audio over gsm and by voice specifications, I must send voice date packets then wait for 20 milliseconds to get normal voice. I use system.threading.thread.sleep(20). However, I noticed that sound is slow .But when i run another different application , sound gets normal.

经过一些调试，我发现 system.Threading.Thread.Sleep(20) 需要 31 毫秒，但如果我运行另一个不同的应用程序，Thread.Sleep (20) 将始终准确.

After some debugging, i found that system.Threading.Thread.Sleep(20) takes 31 milliseconds , but if I run another different application, the Thread.Sleep (20) will always be accurate.

为了使线程准确休眠 20 毫秒，我可以使用哪些其他替代方法?同时不影响PC性能.

what are the other alternatives that I can use in order to make the thread sleep for 20 Milli-seconds accurately & at the same time does not impact PC performance.

谢谢，

答

如前所述，准确的计时通常需要一个不会被时间切片的线程/进程，要做到这一点，你必须Spin 而不是 睡眠.

As mentioned, accurate timings generally need a thread/process that is not going to time sliced out, to do this, you must Spin rather than Sleep.

选项 1

如果您想要绝对的准确性，我会使用带有秒表的专用高优先级线程.

If you want absolute accuracy over anything else, I would use a dedicated high priority thread with a Stopwatch.

bool running = true;
Thread t = new Thread(() =>
{
    Stopwatch sw = Stopwatch.StartNew();
    while (running)
    {
        if (sw.ElapsedMilliseconds >= 20)
        {
            RunCode();
            sw.Restart();
        }
    }
}) { Priority = ThreadPriority.Highest, IsBackground = true };

t.Start();

// ...

running = false;
t.Join();

选项 2

稍微瘦一点，不会在不同的线程上运行但仍然旋转.

Bit more slimmed down, doesn't run on a different thread but still spins.

while (true) 
{
    SpinWait.SpinUntil(() => false, TimeSpan.FromMilliseconds(20));
    RunCode();
}

选项 3

一些开源的高分辨率定时器代码.例如https://gist.github.com/HakanL/4669495

Some open source high resolution timer code. e.g. https://gist.github.com/HakanL/4669495

.net thread.sleep 不准确

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