线程延时

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在进行多线程编程时，经常需要进行一些线程的延时，而对于Sleep 是不准确的，所以需要获取震片时间钟进行延时。代码如下:

ULONG GetTimeDis(struct tm first, struct tm second)

{    return abs((first.tm_hour * 3600 + first.tm_min * 60 + first.tm_sec)        - (second.tm_hour * 3600 + second.tm_min * 60 + second.tm_sec));}//延时 微妙级别void Delay(ULONG ulMicroSeconds){    LARGE_INTEGER  timeStop;     LARGE_INTEGER  timeStart;     LARGE_INTEGER  Freq;     ULONG  ulTimeToWait;    __try { if (!QueryPerformanceFrequency( &Freq ))return;ulTimeToWait = Freq.QuadPart * ulMicroSeconds / 1000 / 1000; QueryPerformanceCounter ( &timeStart ); timeStop = timeStart; while( timeStop.QuadPart - timeStart.QuadPart < ulTimeToWait ) { QueryPerformanceCounter( &timeStop ); }} __except( EXCEPTION_EXECUTE_HANDLER ) { AfxMessageBox( "延迟错误") ; }}