1 /* Return time used so far, in microseconds.
2 Copyright (C) 1994, 1999, 2002 Free Software Foundation, Inc.
4 This file is part of the libiberty library.
5 Libiberty is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
10 Libiberty is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with libiberty; see the file COPYING.LIB. If
17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
23 #include "libiberty.h"
25 /* On some systems (such as WindISS), you must include <sys/types.h>
26 to get the definition of "time_t" before you include <time.h>. */
27 #include <sys/types.h>
29 /* There are several ways to get elapsed execution time; unfortunately no
30 single way is available for all host systems, nor are there reliable
31 ways to find out which way is correct for a given host. */
33 #ifdef TIME_WITH_SYS_TIME
34 # include <sys/time.h>
38 # include <sys/time.h>
46 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
47 #include <sys/resource.h>
51 #ifdef HAVE_SYS_PARAM_H
52 #include <sys/param.h>
54 #include <sys/times.h>
61 /* This is a fallback; if wrong, it will likely make obviously wrong
64 #ifndef CLOCKS_PER_SEC
65 #define CLOCKS_PER_SEC 1
69 #define GNU_HZ sysconf(_SC_CLK_TCK)
75 #define GNU_HZ CLOCKS_PER_SEC
82 @deftypefn Replacement long get_run_time (void)
84 Returns the time used so far, in microseconds. If possible, this is
85 the time used by this process, else it is the elapsed time since the
95 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
98 getrusage (0, &rusage
);
99 return (rusage
.ru_utime
.tv_sec
* 1000000 + rusage
.ru_utime
.tv_usec
100 + rusage
.ru_stime
.tv_sec
* 1000000 + rusage
.ru_stime
.tv_usec
);
101 #else /* ! HAVE_GETRUSAGE */
106 return (tms
.tms_utime
+ tms
.tms_stime
) * (1000000 / GNU_HZ
);
107 #else /* ! HAVE_TIMES */
108 /* Fall back on clock and hope it's correctly implemented. */
109 const long clocks_per_sec
= CLOCKS_PER_SEC
;
110 if (clocks_per_sec
<= 1000000)
111 return clock () * (1000000 / clocks_per_sec
);
113 return clock () / clocks_per_sec
;
114 #endif /* HAVE_TIMES */
115 #endif /* HAVE_GETRUSAGE */
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