117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/* Return time used so far, in microseconds.
|
|
Copyright (C) 1994, 1999, 2002 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"
|
|
|
|
/* On some systems (such as WindISS), you must include <sys/types.h>
|
|
to get the definition of "time_t" before you include <time.h>. */
|
|
#include <sys/types.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. */
|
|
|
|
#ifdef TIME_WITH_SYS_TIME
|
|
# include <sys/time.h>
|
|
# include <time.h>
|
|
#else
|
|
# if HAVE_SYS_TIME_H
|
|
# include <sys/time.h>
|
|
# else
|
|
# ifdef HAVE_TIME_H
|
|
# include <time.h>
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_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
|
|
|
|
/*
|
|
|
|
@deftypefn Replacement long get_run_time (void)
|
|
|
|
Returns the time used so far, in microseconds. If possible, this is
|
|
the time used by this process, else it is the elapsed time since the
|
|
process started.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
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 */
|
|
}
|