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gettimeofday.c
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/*
* gettimeofday function for Windows
*
* http://www.cpp-programming.net/c-tidbits/gettimeofday-function-for-windows/
*
*/
#include "gettimeofday.h"
#include <time.h>
#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
#define DELTA_EPOCH_IN_MICROSECS 116444736000000000Ui64
#else
#define DELTA_EPOCH_IN_MICROSECS 116444736000000000ULL
#endif
int gettimeofday(struct timeval *tv, struct timezone *tz)
{
FILETIME ft;
unsigned __int64 tmpres = 0;
static int tzflag;
if (NULL != tv)
{
GetSystemTimeAsFileTime(&ft);
tmpres |= ft.dwHighDateTime;
tmpres <<= 32;
tmpres |= ft.dwLowDateTime;
/*converting file time to unix epoch*/
tmpres /= 10; /*convert into microseconds*/
tmpres -= DELTA_EPOCH_IN_MICROSECS;
tv->tv_sec = (long)(tmpres / 1000000UL);
tv->tv_usec = (long)(tmpres % 1000000UL);
}
if (NULL != tz)
{
if (!tzflag)
{
_tzset();
tzflag++;
}
tz->tz_minuteswest = _timezone / 60;
tz->tz_dsttime = _daylight;
}
return 0;
}
void sleep(int seconds)
{
Sleep (1000 * seconds);
}
static double Freq;
void usleep(int useconds)
{
static int init = 1;
LARGE_INTEGER start, now;
int counter = 0;
if (init)
{
LARGE_INTEGER perfFreq;
QueryPerformanceFrequency(&perfFreq);
Freq = perfFreq.QuadPart;
init = 0;
}
QueryPerformanceCounter(&start);
do
{
if (0 == (++counter & 31)) _mm_pause ();
QueryPerformanceCounter((LARGE_INTEGER*) &now);
} while ((now.QuadPart - start.QuadPart) * 1000.0 * 1000.0 / Freq < useconds);
}