如何使线程睡眠在Windows上少于一毫秒 [英] How to make thread sleep less than a millisecond on Windows

问题描述

在Windows上我有一个问题，我从来没有遇到过Unix。这是如何让线程睡眠不到一毫秒。在Unix上，你通常有一些选择（sleep，usleep和nanosleep）来满足你的需要。然而，在Windows上，只有具有毫秒粒度的 Sleep 。

On Windows I have a problem I never encountered on Unix. That is how to get a thread to sleep for less than one millisecond. On Unix you typically have a number of choices (sleep, usleep and nanosleep) to fit your needs. On Windows, however, there is only Sleep with millisecond granularity.

在Unix上，我可以使用 select 系统调用来创建一个微秒级的睡眠，

On Unix, I can use the use the select system call to create a microsecond sleep which is pretty straightforward:

int usleep(long usec)
{
    struct timeval tv;
    tv.tv_sec = usec/1000000L;
    tv.tv_usec = usec%1000000L;
    return select(0, 0, 0, 0, &tv);
}

如何在Windows上实现相同的功能？

How can I achieve the same on Windows?

推荐答案

在Windows上，使用 select 会强制您加入 Winsock 库，在应用程序中必须像这样初始化：

On Windows the use of select forces you to include the Winsock library which has to be initialized like this in your application:

WORD wVersionRequested = MAKEWORD(1,0);
WSADATA wsaData;
WSAStartup(wVersionRequested, &wsaData);

然后选择将不允许你调用没有任何套接字，因此你必须做一个再创建一个microsleep方法：

And then the select won't allow you to be called without any socket so you have to do a little more to create a microsleep method:

int usleep(long usec)
{
    struct timeval tv;
    fd_set dummy;
    SOCKET s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
    FD_ZERO(&dummy);
    FD_SET(s, &dummy);
    tv.tv_sec = usec/1000000L;
    tv.tv_usec = usec%1000000L;
    return select(0, 0, 0, &dummy, &tv);
}

所有这些创建的usleep方法在成功时返回零，

All these created usleep methods return zero when successful and non-zero for errors.

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