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84 lines
2.2 KiB
84 lines
2.2 KiB
11 years ago
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#include < time.h >
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#include <windows.h> //I've ommited this line.
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#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
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#else
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
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#endif
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struct timezone
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{
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int tz_minuteswest; /* minutes W of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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int gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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FILETIME ft;
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unsigned __int64 tmpres = 0;
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static int tzflag;
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if (NULL != tv)
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{
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GetSystemTimeAsFileTime(&ft);
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tmpres |= ft.dwHighDateTime;
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tmpres <<= 32;
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tmpres |= ft.dwLowDateTime;
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/*converting file time to unix epoch*/
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tmpres /= 10; /*convert into microseconds*/
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tmpres -= DELTA_EPOCH_IN_MICROSECS;
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tv->tv_sec = (long)(tmpres / 1000000UL);
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tv->tv_usec = (long)(tmpres % 1000000UL);
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}
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if (NULL != tz)
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{
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if (!tzflag)
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{
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_tzset();
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tzflag++;
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}
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tz->tz_minuteswest = _timezone / 60;
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tz->tz_dsttime = _daylight;
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}
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return 0;
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}
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void usleep(__int64 waitTime)
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{
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if (waitTime > 0)
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{
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if (waitTime > 100)
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{
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// use a waitable timer for larger intervals > 0.1ms
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HANDLE timer;
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LARGE_INTEGER ft;
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ft.QuadPart = -(10*waitTime); // Convert to 100 nanosecond interval, negative value indicates relative time
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timer = CreateWaitableTimer(NULL, TRUE, NULL);
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SetWaitableTimer(timer, &ft, 0, NULL, NULL, 0);
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WaitForSingleObject(timer, INFINITE);
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CloseHandle(timer);
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}
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else
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{
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// use a polling loop for short intervals <= 100ms
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LARGE_INTEGER perfCnt, start, now;
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__int64 elapsed;
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QueryPerformanceFrequency(&perfCnt);
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QueryPerformanceCounter(&start);
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do {
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QueryPerformanceCounter((LARGE_INTEGER*) &now);
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elapsed = (__int64)((now.QuadPart - start.QuadPart) / (float)perfCnt.QuadPart * 1000 * 1000);
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} while ( elapsed < waitTime );
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}
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}
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}
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