QueryPerformanceCounter实现Windows微秒级延时

windows的Sleep函数,睡眠线程指定毫秒数,可以用来做毫秒延时。

对于微秒延时,没有一个现成的函数,但是可以通过

QueryPerformanceFrequency

QueryPerformanceCounter

来间接实现。原理就是用循环查询的方式不断调用QueryPerformanceCounter(在Winbase.h中)

LARGE_INTEGER freq;
LARGE_INTEGER start, end;
QueryPerformanceFrequency(&freq);
unsigned int us = 100000;
LONGLONG count = (us * freq.QuadPart) / (1000 * 1000);
QueryPerformanceCounter(&start);
count = count + startQuadPart ;
do
{
   QueryPerformanceCounter(&end);
}while(end.QuadPart< count);
printf("us %u, elaps %u ms\r\n", us, tpend-tpstart);

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