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/*
timing.c - Timing routines for computing elapsed wall time
Copyright (C) 1994 Michael D. Black
Copyright (C) 1996, 1997 Uwe Ohse
This program 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 2, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
originally written by Michael D. Black, mblack@csihq.com
*/
#include "zglobal.h"
#include "timing.h"
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if !defined(TIME_WITH_SYS_TIME) && !defined(HAVE_SYS_TIME_H)
/* can't use gettimeofday without struct timeval */
# undef HAVE_GETTIMEOFDAY
#endif
/* Prefer gettimeofday to ftime to times. */
#if defined(HAVE_GETTIMEOFDAY)
# undef HAVE_FTIME
# undef HAVE_TIMES
#else
# if defined(HAVE_FTIME)
# undef HAVE_TIMES
# endif
#endif
#ifdef HAVE_FTIME
# include <sys/timeb.h>
#endif
#ifdef HAVE_TIMES
# if HAVE_SYS_TIMES_H
# include <sys/times.h>
# endif
# ifdef _SC_CLK_TCK
# define HAVE_SC_CLK_TCK 1
# else
# define HAVE_SC_CLK_TCK 0
# endif
/* TIMES_TICK may have been set in policy.h, or we may be able to get
it using sysconf. If neither is the case, try to find a useful
definition from the system header files. */
# if !defined(TIMES_TICK) && (!defined(HAVE_SYSCONF) || !defined(HAVE_SC_CLK_TCK))
# ifdef CLK_TCK
# define TIMES_TICK CLK_TCK
# else /* ! defined (CLK_TCK) */
# ifdef HZ
# define TIMES_TICK HZ
# endif /* defined (HZ) */
# endif /* ! defined (CLK_TCK) */
#else
# endif /* TIMES_TICK == 0 && (! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK) */
# ifndef TIMES_TICK
# define TIMES_TICK 0
# endif
#endif /* HAVE_TIMES */
#ifdef HAVE_GETTIMEOFDAY
/* collides with Solaris 2.5 prototype? */
/* int gettimeofday (struct timeval *tv, struct timezone *tz); */
#endif
double
timing (int reset, time_t *nowp)
{
static double elaptime, starttime, stoptime;
double yet;
#define NEED_TIME
#ifdef HAVE_GETTIMEOFDAY
struct timeval tv;
struct timezone tz;
#ifdef DST_NONE
tz.tz_dsttime = DST_NONE;
#else
tz.tz_dsttime = 0;
#endif
gettimeofday (&tv, &tz);
yet=tv.tv_sec + tv.tv_usec/1000000.0;
#undef NEED_TIME
#endif
#ifdef HAVE_FTIME
static int fbad=0;
if (! fbad)
{
struct timeb stime;
static struct timeb slast;
(void) ftime (&stime);
/* On some systems, such as SCO 3.2.2, ftime can go backwards in
time. If we detect this, we switch to using time. */
if (slast.time != 0
&& (stime.time < slast.time
|| (stime.time == slast.time && stime.millitm < slast.millitm)))
fbad = 1;
else
{
yet = stime.millitm / 1000.0 + stime.time;
slast = stime;
}
}
if (fbad)
yet=(double) time(NULL);
#undef NEED_TIME
#endif
#ifdef HAVE_TIMES
struct tms s;
long i;
static int itick;
if (itick == 0)
{
#if TIMES_TICK == 0
#if HAVE_SYSCONF && HAVE_SC_CLK_TCK
itick = (int) sysconf (_SC_CLK_TCK);
#else /* ! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK */
const char *z;
z = getenv ("HZ");
if (z != NULL)
itick = (int) strtol (z, (char **) NULL, 10);
/* If we really couldn't get anything, just use 60. */
if (itick == 0)
itick = 60;
#endif /* ! HAVE_SYSCONF || ! HAVE_SC_CLK_TCK */
#else /* TIMES_TICK != 0 */
itick = TIMES_TICK;
#endif /* TIMES_TICK == 0 */
}
yet = ((double) times (&s)) / itick;
#undef NEED_TIME
#endif
#ifdef NEED_TIME
yet=(double) time(NULL);
#endif
if (nowp)
*nowp=(time_t) yet;
if (reset) {
starttime = yet;
return starttime;
}
else {
stoptime = yet;
elaptime = stoptime - starttime;
return elaptime;
}
}
/*#define TEST*/
#ifdef TEST
main()
{
int i;
printf("timing %g\n",timing(1));
printf("timing %g\n",timing(0));
for(i=0;i<20;i++){
sleep(1);
printf("timing %g\n",timing(0));
}
}
#endif
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