getruntime.c revision 89857 
140682Snsouch/* Return time used so far, in microseconds.
240682Snsouch   Copyright (C) 1994, 1999 Free Software Foundation, Inc.
340682Snsouch
440682SnsouchThis file is part of the libiberty library.
540682SnsouchLibiberty is free software; you can redistribute it and/or
640682Snsouchmodify it under the terms of the GNU Library General Public
740682SnsouchLicense as published by the Free Software Foundation; either
840682Snsouchversion 2 of the License, or (at your option) any later version.
940682Snsouch
1040682SnsouchLibiberty is distributed in the hope that it will be useful,
1140682Snsouchbut WITHOUT ANY WARRANTY; without even the implied warranty of
1240682SnsouchMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
1340682SnsouchLibrary General Public License for more details.
1440682Snsouch
1540682SnsouchYou should have received a copy of the GNU Library General Public
1640682SnsouchLicense along with libiberty; see the file COPYING.LIB.  If
1740682Snsouchnot, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
1840682SnsouchBoston, MA 02111-1307, USA.  */
1940682Snsouch
2040682Snsouch#include "config.h"
2140682Snsouch
2240682Snsouch#include "ansidecl.h"
2340682Snsouch#include "libiberty.h"
2440682Snsouch
2550476Speter/* There are several ways to get elapsed execution time; unfortunately no
2640682Snsouch   single way is available for all host systems, nor are there reliable
27274822Sian   ways to find out which way is correct for a given host. */
2840682Snsouch
2979538Sru#ifdef TIME_WITH_SYS_TIME
3040682Snsouch# include <sys/time.h>
3140682Snsouch# include <time.h>
3275670Sru#else
3340682Snsouch# if HAVE_SYS_TIME_H
3456460Sasmodai#  include <sys/time.h>
3556460Sasmodai# else
3640682Snsouch#  ifdef HAVE_TIME_H
3756460Sasmodai#   include <time.h>
3856460Sasmodai#  endif
3956460Sasmodai# endif
4040682Snsouch#endif
4140682Snsouch
4240682Snsouch#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
4340682Snsouch#include <sys/resource.h>
4440682Snsouch#endif
4540682Snsouch
4640682Snsouch#ifdef HAVE_TIMES
4757676Ssheldonh#ifdef HAVE_SYS_PARAM_H
4857676Ssheldonh#include <sys/param.h>
4957676Ssheldonh#endif
50141851Sru#include <sys/times.h>
5140682Snsouch#endif
5240682Snsouch
5340682Snsouch#ifdef HAVE_UNISTD_H
5457676Ssheldonh#include <unistd.h>
5557676Ssheldonh#endif
5640682Snsouch
5770466Sru/* This is a fallback; if wrong, it will likely make obviously wrong
5840682Snsouch   results. */
5957676Ssheldonh
6057676Ssheldonh#ifndef CLOCKS_PER_SEC
6168881Sben#define CLOCKS_PER_SEC 1
6240682Snsouch#endif
6357676Ssheldonh
6457676Ssheldonh#ifdef _SC_CLK_TCK
6568881Sben#define GNU_HZ  sysconf(_SC_CLK_TCK)
6670466Sru#else
6757676Ssheldonh#ifdef HZ
6857676Ssheldonh#define GNU_HZ  HZ
6940682Snsouch#else
7057676Ssheldonh#ifdef CLOCKS_PER_SEC
7157676Ssheldonh#define GNU_HZ  CLOCKS_PER_SEC
7257676Ssheldonh#endif
7357676Ssheldonh#endif
7440682Snsouch#endif
7540682Snsouch
7640682Snsouch/*
7740682Snsouch
7840682Snsouch@deftypefn Replacement long get_run_time (void)
7940682Snsouch
8040682SnsouchReturns the time used so far, in microseconds.  If possible, this is
8140682Snsouchthe time used by this process, else it is the elapsed time since the
8240682Snsouchprocess started.
8340682Snsouch
8440682Snsouch@end deftypefn
8540682Snsouch
8657676Ssheldonh*/
8757676Ssheldonh
8840682Snsouchlong
8957676Ssheldonhget_run_time ()
9057676Ssheldonh{
9140682Snsouch#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
9270466Sru  struct rusage rusage;
9340682Snsouch
9468881Sben  getrusage (0, &rusage);
9540682Snsouch  return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
9670466Sru	  + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
9740682Snsouch#else /* ! HAVE_GETRUSAGE */
9840682Snsouch#ifdef HAVE_TIMES
9940682Snsouch  struct tms tms;
10040682Snsouch
10140682Snsouch  times (&tms);
10240682Snsouch  return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
10340682Snsouch#else /* ! HAVE_TIMES */
10440682Snsouch  /* Fall back on clock and hope it's correctly implemented. */
10540682Snsouch  const long clocks_per_sec = CLOCKS_PER_SEC;
106274822Sian  if (clocks_per_sec <= 1000000)
107274822Sian    return clock () * (1000000 / clocks_per_sec);
108274822Sian  else
109275991Sbrueffer    return clock () / clocks_per_sec;
110275991Sbrueffer#endif  /* HAVE_TIMES */
111274822Sian#endif  /* HAVE_GETRUSAGE */
112274822Sian}
113275991Sbrueffer