#ifndef __seconds_h__ #define __seconds_h__ 1 #ifdef _WIN32 #include #include #include #include #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64 #else #define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL #endif struct timezone { int tz_minuteswest; /* minutes W of Greenwich */ int tz_dsttime; /* type of dst correction */ }; // Definition of a gettimeofday function inline int gettimeofday(struct timeval *tv, struct timezone *tz) { // Define a structure to receive the current Windows filetime FILETIME ft; // Initialize the present time to 0 and the timezone to UTC unsigned __int64 tmpres = 0; static int tzflag = 0; if (NULL != tv) { GetSystemTimeAsFileTime(&ft); // The GetSystemTimeAsFileTime returns the number of 100 nanosecond // intervals since Jan 1, 1601 in a structure. Copy the high bits to // the 64 bit tmpres, shift it left by 32 then or in the low 32 bits. tmpres |= ft.dwHighDateTime; tmpres <<= 32; tmpres |= ft.dwLowDateTime; // Convert to microseconds by dividing by 10 tmpres /= 10; // The Unix epoch starts on Jan 1 1970. Need to subtract the difference // in seconds from Jan 1 1601. tmpres -= DELTA_EPOCH_IN_MICROSECS; // Finally change microseconds to seconds and place in the seconds value. // The modulus picks up the microseconds. tv->tv_sec = (long)(tmpres / 1000000UL); tv->tv_usec = (long)(tmpres % 1000000UL); } if (NULL != tz) { if (!tzflag) { _tzset(); tzflag++; } // Adjust for the timezone west of Greenwich tz->tz_minuteswest = _timezone / 60; tz->tz_dsttime = _daylight; } return 0; } #else #include #endif namespace utils { inline double totalseconds() { timeval tv; gettimeofday(&tv,NULL); return tv.tv_sec+tv.tv_usec/1000000.0; } inline double seconds() { static double lastseconds=totalseconds(); double t=totalseconds(); double seconds=t-lastseconds; lastseconds=t; return seconds; } } #endif