问题描述

在 Windows 上，我遇到了在 Unix 上从未遇到过的问题.这就是让线程休眠少于一毫秒的方法.在 Unix 上，您通常有多种选择(sleep、usleep 和 nanosleep)来满足您的需求.然而，在 Windows 上，只有 Sleep 以毫秒为粒度.

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非常简单的微秒睡眠:

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 上实现相同的效果?

How can I achieve the same on Windows?

推荐答案

在 Windows 上使用 select 强制您包含 Winsock 库，它必须在您的应用程序中像这样初始化:

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 select 将不允许在没有任何套接字的情况下调用您，因此您必须做更多的事情来创建 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，错误时返回非零.

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

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