問題描述

操作系統:Windows 7

OS: Windows 7

當調用 WinAPI Sleep() 函數作為 Sleep(1) 時，線程實際上會休眠 15 毫秒.我循環了 100 次，總睡眠時間是 1500 毫秒而不是 100 毫秒.

When calling the WinAPI Sleep() function as Sleep(1) the thread actually sleeps for 15ms. I did it 100 times in a loop and the total sleep time was 1500ms instead of 100.

這是常見行為還是我應該擔心我的 MOBO、CPU、Windows 安裝出現問題?

Is this common behavior or should I be concerced about something being wrong with my MOBO, CPU, Windows installion?

如果可能，您可以運行此代碼并發布睡眠時間有多長.我讓我的一個朋友運行了這個，他實際上在 1 毫秒內就完成了.

If possible could you run this code and post how long the sleep time was. I let a friend of mine run this, and he actually had it all at 1ms.

#include <iostream>
#include <ctime>
#include <Windows.h>

void test(void)
{
    std::cout << "Testing 1ms sleep." << std::endl;

    for (unsigned int i = 0; i < 10; i++)
    {
        std::clock_t startClocks = std::clock();

        Sleep(1);

        std::clock_t clocksTaken = std::clock() - startClocks;
        std::cout << "Time: " << clocksTaken << "ms." << std::endl;
    }
}

int main(void)
{
    test();

    std::cin.sync();
    std::cin.get();
    return 0;
}

似乎有些人得到 1ms 的原因是其他一些程序正在運行，將系統范圍的計時器分辨率設置為 1ms.默認情況下，這在 Windows 7 上應該是 15.6 毫秒.

It seems that the reason why some people are getting 1ms is that some other program is running that sets the system-wide timer resolution to 1ms. By default this should be 15.6ms on Windows 7.

推薦答案

這是常見的行為嗎

Is this common behavior

是的.

Window 的線程調度程序在時間片上工作(確切長度取決于各種因素，包括 Windows 版本和版本).實際上，任何非零延遲都會向上舍入為一個完整的量程.

Window's thread scheduler works on a time quantum (exact length depends of various factors including Windows version and edition). Effectively any non-zero delay is rounded up to a complete quantum.

這篇關于WinAPI Sleep() 函數調用休眠的時間比預期的要長的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！