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39 lines
986 B
C
39 lines
986 B
C
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#ifndef CLOCK_GETTIME_H_
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#define CLOCK_GETTIME_H_
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#include <windows.h>
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#define MS_PER_SEC 1000ULL // MS = milliseconds
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#define US_PER_MS 1000ULL // US = microseconds
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#define HNS_PER_US 10ULL // HNS = hundred-nanoseconds (e.g., 1 hns = 100 ns)
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#define NS_PER_US 1000ULL
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#define HNS_PER_SEC (MS_PER_SEC * US_PER_MS * HNS_PER_US)
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#define NS_PER_HNS (100ULL) // NS = nanoseconds
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#define NS_PER_SEC (MS_PER_SEC * US_PER_MS * NS_PER_US)
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int clock_gettime(int X, struct timespec* tv)
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{
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static LARGE_INTEGER ticksPerSec;
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LARGE_INTEGER ticks;
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if (!ticksPerSec.QuadPart)
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{
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QueryPerformanceFrequency(&ticksPerSec);
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if (!ticksPerSec.QuadPart)
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{
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errno = ENOTSUP;
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return -1;
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}
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}
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QueryPerformanceCounter(&ticks);
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tv->tv_sec = (long)(ticks.QuadPart / ticksPerSec.QuadPart);
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tv->tv_nsec = (long)(((ticks.QuadPart % ticksPerSec.QuadPart) * NS_PER_SEC) / ticksPerSec.QuadPart);
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return 0;
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}
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#endif
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