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76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
#if defined _WIN32
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// The function 'clock_gettime' is not available on Windows.
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// Our replacement implementation was taken from Stack overflow:
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// https://stackoverflow.com/questions/5404277/porting-clock-gettime-to-windows
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#include <windows.h>
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#define CLOCK_REALTIME 0
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LARGE_INTEGER getFILETIMEoffset() {
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SYSTEMTIME s;
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FILETIME f;
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LARGE_INTEGER t;
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s.wYear = 1970;
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s.wMonth = 1;
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s.wDay = 1;
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s.wHour = 0;
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s.wMinute = 0;
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s.wSecond = 0;
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s.wMilliseconds = 0;
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SystemTimeToFileTime(&s, &f);
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t.QuadPart = f.dwHighDateTime;
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t.QuadPart <<= 32;
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t.QuadPart |= f.dwLowDateTime;
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return (t);
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}
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int clock_gettime(int X, struct timeval *tv) {
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LARGE_INTEGER t;
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FILETIME f;
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double microseconds;
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static LARGE_INTEGER offset;
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static double frequencyToMicroseconds;
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static int initialized = 0;
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static BOOL usePerformanceCounter = 0;
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if (!initialized) {
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LARGE_INTEGER performanceFrequency;
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initialized = 1;
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usePerformanceCounter =
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QueryPerformanceFrequency(&performanceFrequency);
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if (usePerformanceCounter) {
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QueryPerformanceCounter(&offset);
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frequencyToMicroseconds =
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(double)performanceFrequency.QuadPart / 1000000.;
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} else {
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offset = getFILETIMEoffset();
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frequencyToMicroseconds = 10.;
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}
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}
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if (usePerformanceCounter)
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QueryPerformanceCounter(&t);
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else {
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GetSystemTimeAsFileTime(&f);
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t.QuadPart = f.dwHighDateTime;
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t.QuadPart <<= 32;
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t.QuadPart |= f.dwLowDateTime;
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}
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t.QuadPart -= offset.QuadPart;
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microseconds = (double)t.QuadPart / frequencyToMicroseconds;
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t.QuadPart = microseconds;
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tv->tv_sec = t.QuadPart / 1000000;
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tv->tv_usec = t.QuadPart % 1000000;
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return (0);
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}
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#endif
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double get_time_elapsed() {
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struct timespec tv;
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clock_gettime(CLOCK_REALTIME, &tv);
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return 1000000000 * tv.tv_sec + tv.tv_nsec;
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}
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