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/* Return time used so far, in microseconds.
   Copyright (C) 1994, 1999 Free Software Foundation, Inc.
 
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
 
Libiberty 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
Library General Public License for more details.
 
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
 
#include "config.h"
 
#include "ansidecl.h"
#include "libiberty.h"
 
/* There are several ways to get elapsed execution time; unfortunately no
   single way is available for all host systems, nor are there reliable
   ways to find out which way is correct for a given host. */
 
#include <time.h>
 
#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
#include <sys/time.h>
#include <sys/resource.h>
#endif
 
#ifdef HAVE_TIMES
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/times.h>
#endif
 
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
 
/* This is a fallback; if wrong, it will likely make obviously wrong
   results. */
 
#ifndef CLOCKS_PER_SEC
#define CLOCKS_PER_SEC 1
#endif
 
#ifdef _SC_CLK_TCK
#define GNU_HZ  sysconf(_SC_CLK_TCK)
#else
#ifdef HZ
#define GNU_HZ  HZ
#else
#ifdef CLOCKS_PER_SEC
#define GNU_HZ  CLOCKS_PER_SEC
#endif
#endif
#endif
 
long
get_run_time ()
{
#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
  struct rusage rusage;
 
  getrusage (0, &rusage);
  return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
	  + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
#else /* ! HAVE_GETRUSAGE */
#ifdef HAVE_TIMES
  struct tms tms;
 
  times (&tms);
  return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
#else /* ! HAVE_TIMES */
  /* Fall back on clock and hope it's correctly implemented. */
  const long clocks_per_sec = CLOCKS_PER_SEC;
  if (clocks_per_sec <= 1000000)
    return clock () * (1000000 / clocks_per_sec);
  else
    return clock () / clocks_per_sec;
#endif  /* HAVE_TIMES */
#endif  /* HAVE_GETRUSAGE */
}