如何在线程中实现精度为1毫秒的延时，且不占用CPU

[wanjinball]

需要在线程中实现一个延时，该延时需要精确到1毫秒，而且要像Sleep似的不占用CPU资源。如果使用获取CPU频率的办法，就会使得CPU占用率达到100%，肯定不能使用的。请各位大拿教我一种办法，谢谢了!

[vcmute]

int main()
{
HANDLE hTimer = NULL;
LARGE_INTEGER liDueTime;

liDueTime.QuadPart=-100000000;

// Create a waitable timer.
hTimer = CreateWaitableTimer(NULL, TRUE, "WaitableTimer");
if (!hTimer)
{
printf("CreateWaitableTimer failed (%d)\n", GetLastError());
return 1;
}

printf("Waiting for 10 seconds...\n");

// Set a timer to wait for 10 seconds.
if (!SetWaitableTimer(
hTimer, &liDueTime, 0, NULL, NULL, 0))
{
printf("SetWaitableTimer failed (%d)\n", GetLastError());
return 2;
}

// Wait for the timer.

if (WaitForSingleObject(hTimer, INFINITE) != WAIT_OBJECT_0)
printf("WaitForSingleObject failed (%d)\n", GetLastError());
else printf("Timer was signaled.\n");

return 0;
}

例子是10秒，自己改改

[顶顶通-FreeSWITCH二次开发接口]

up

[zhoujiamurong]

这个和sleep()一样,10毫秒还可以,1毫秒就误差太大

[nkwesley]

使用sleep函数的不利只处在于期间不能处理其他的消息，如果时间太长，就好象死机一样，利用ColeDateTime类和ColeDateTimeSpan类实现延时：
ColeDateTime start_time = ColeDateTime::GetCurrentTime();
ColeDateTimeSpan end_time = ColeDateTime::GetCurrentTime()-start_time;
While(end_time.GetTotalSeconds() <= 2)
{
MSG msg;
GetMessage(&msg,NULL,0,0);
PreTranslateMessage(&msg);
End_time = ColeDateTime::GetCurrentTime-start_time;
}
这样在延时的时候我们也能够处理其他的消息。

[FengYuanMSFT]

There is no way to achieve accurate delay in Windows, because it's not a real time operating system.

Try use a dual core CPU.

[一条晚起的虫]

要求太高，做不到

[bomdy]

可以用Multimedia Timer

timeBeginPeriod(1); //设精度为1ms
timeSetEvent(1, 1, TimeCallBack, (DWORD)m_hWnd, TIME_PERIODIC); //设置timer

在TimeCallBack中向窗口送WM_TIMER消息即可