WiseAlex
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Pupsik
тестовая прога
Код:
int _tmain(int argc, _TCHAR* argv[])
{
LARGE_INTEGER Freq;
QueryPerformanceFrequency(&Freq);
LARGE_INTEGER PrevCounter,CurCounter;
for(int i=0;i<50;++i)
{
QueryPerformanceCounter(&PrevCounter);
Sleep(i);
QueryPerformanceCounter(&CurCounter);
double time=double(CurCounter.QuadPart-PrevCounter.QuadPart)/Freq.QuadPart*1000;
cout<<"Sleep time: "<<i<<"ms, Real sleep time:"<<time<<"ms\n";
} // for(int i=0;i<50;++i)
return 0;
}
|
результат:
Sleep time: 0ms, Real sleep time:0.00307302ms
Sleep time: 1ms, Real sleep time:10.2133ms
Sleep time: 2ms, Real sleep time:15.5517ms
Sleep time: 3ms, Real sleep time:15.5749ms
Sleep time: 4ms, Real sleep time:15.5995ms
Sleep time: 5ms, Real sleep time:15.6417ms
Sleep time: 6ms, Real sleep time:15.5897ms
Sleep time: 7ms, Real sleep time:15.5827ms
Sleep time: 8ms, Real sleep time:15.6011ms
Sleep time: 9ms, Real sleep time:15.6274ms
Sleep time: 10ms, Real sleep time:15.5176ms
Sleep time: 11ms, Real sleep time:15.6193ms
Sleep time: 12ms, Real sleep time:15.581ms
Sleep time: 13ms, Real sleep time:15.6056ms
Sleep time: 14ms, Real sleep time:15.7283ms
Sleep time: 15ms, Real sleep time:15.457ms
Sleep time: 16ms, Real sleep time:31.2361ms
...
1 мс неустойчива - система не ждет, а возвращает управление когда сочтет нужным у меня для 1 мс разброс от 0,3мс до 15 |
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