1 /* Return time used so far, in microseconds.
2 Copyright (C) 1994, 1999 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 /* There are several ways to get elapsed execution time; unfortunately no
26 single way is available for all host systems, nor are there reliable
27 ways to find out which way is correct for a given host. */
29 #ifdef TIME_WITH_SYS_TIME
30 # include <sys/time.h>
34 # include <sys/time.h>
42 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
43 #include <sys/resource.h>
47 #ifdef HAVE_SYS_PARAM_H
48 #include <sys/param.h>
50 #include <sys/times.h>
57 /* This is a fallback; if wrong, it will likely make obviously wrong
60 #ifndef CLOCKS_PER_SEC
61 #define CLOCKS_PER_SEC 1
65 #define GNU_HZ sysconf(_SC_CLK_TCK)
71 #define GNU_HZ CLOCKS_PER_SEC
78 @deftypefn Replacement long get_run_time (void)
80 Returns the time used so far, in microseconds. If possible, this is
81 the time used by this process, else it is the elapsed time since the
91 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
94 getrusage (0, &rusage
);
95 return (rusage
.ru_utime
.tv_sec
* 1000000 + rusage
.ru_utime
.tv_usec
96 + rusage
.ru_stime
.tv_sec
* 1000000 + rusage
.ru_stime
.tv_usec
);
97 #else /* ! HAVE_GETRUSAGE */
102 return (tms
.tms_utime
+ tms
.tms_stime
) * (1000000 / GNU_HZ
);
103 #else /* ! HAVE_TIMES */
104 /* Fall back on clock and hope it's correctly implemented. */
105 const long clocks_per_sec
= CLOCKS_PER_SEC
;
106 if (clocks_per_sec
<= 1000000)
107 return clock () * (1000000 / clocks_per_sec
);
109 return clock () / clocks_per_sec
;
110 #endif /* HAVE_TIMES */
111 #endif /* HAVE_GETRUSAGE */
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