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/* time.c (standard time) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2000-2017 Andrew Makhorin, Department for Applied
* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights
* reserved. E-mail: <address@hidden>.
*
* GLPK is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GLPK is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "env.h"
#include "jd.h"
/***********************************************************************
* NAME
*
* glp_time - determine current universal time
*
* SYNOPSIS
*
* double glp_time(void);
*
* RETURNS
*
* The routine glp_time returns the current universal time (UTC), in
* milliseconds, elapsed since 00:00:00 GMT January 1, 1970. */
#define EPOCH 2440588 /* = jday(1, 1, 1970) */
/* POSIX version ******************************************************/
#if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
#if 0 /* 29/VI-2017 */
#include <sys/time.h>
#include <time.h>
double glp_time(void)
{ struct timeval tv;
struct tm *tm;
int j;
double t;
gettimeofday(&tv, NULL);
#if 0 /* 29/I-2017 */
tm = gmtime(&tv.tv_sec);
#else
tm = xgmtime(&tv.tv_sec);
#endif
j = jday(tm->tm_mday, tm->tm_mon + 1, 1900 + tm->tm_year);
xassert(j >= 0);
t = ((((double)(j - EPOCH) * 24.0 + (double)tm->tm_hour) * 60.0 +
(double)tm->tm_min) * 60.0 + (double)tm->tm_sec) * 1000.0 +
(double)(tv.tv_usec / 1000);
return t;
}
#else
#include <sys/time.h>
double glp_time(void)
{ struct timeval tv;
double t;
gettimeofday(&tv, NULL);
t = (double)tv.tv_sec + (double)(tv.tv_usec) / 1e6;
xassert(0.0 <= t && t < 4294967296.0);
return 1000.0 * t;
}
#endif
/* MS Windows version *************************************************/
#elif defined(__WOE__)
#include <windows.h>
double glp_time(void)
{ SYSTEMTIME st;
int j;
double t;
GetSystemTime(&st);
j = jday(st.wDay, st.wMonth, st.wYear);
xassert(j >= 0);
t = ((((double)(j - EPOCH) * 24.0 + (double)st.wHour) * 60.0 +
(double)st.wMinute) * 60.0 + (double)st.wSecond) * 1000.0 +
(double)st.wMilliseconds;
return t;
}
/* portable ANSI C version ********************************************/
#else
#include <time.h>
double glp_time(void)
{ time_t timer;
struct tm *tm;
int j;
double t;
timer = time(NULL);
#if 0 /* 29/I-2017 */
tm = gmtime(&timer);
#else
tm = xgmtime(&timer);
#endif
j = jday(tm->tm_mday, tm->tm_mon + 1, 1900 + tm->tm_year);
xassert(j >= 0);
t = ((((double)(j - EPOCH) * 24.0 + (double)tm->tm_hour) * 60.0 +
(double)tm->tm_min) * 60.0 + (double)tm->tm_sec) * 1000.0;
return t;
}
#endif
/***********************************************************************
* NAME
*
* glp_difftime - compute difference between two time values
*
* SYNOPSIS
*
* double glp_difftime(double t1, double t0);
*
* RETURNS
*
* The routine glp_difftime returns the difference between two time
* values t1 and t0, expressed in seconds. */
double glp_difftime(double t1, double t0)
{ return
(t1 - t0) / 1000.0;
}
/* eof */
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