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
79 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
82 getrusage (0, &rusage
);
83 return (rusage
.ru_utime
.tv_sec
* 1000000 + rusage
.ru_utime
.tv_usec
84 + rusage
.ru_stime
.tv_sec
* 1000000 + rusage
.ru_stime
.tv_usec
);
85 #else /* ! HAVE_GETRUSAGE */
90 return (tms
.tms_utime
+ tms
.tms_stime
) * (1000000 / GNU_HZ
);
91 #else /* ! HAVE_TIMES */
92 /* Fall back on clock and hope it's correctly implemented. */
93 const long clocks_per_sec
= CLOCKS_PER_SEC
;
94 if (clocks_per_sec
<= 1000000)
95 return clock () * (1000000 / clocks_per_sec
);
97 return clock () / clocks_per_sec
;
98 #endif /* HAVE_TIMES */
99 #endif /* HAVE_GETRUSAGE */
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