| 1 | /* Return time used so far, in microseconds.
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| 2 | Copyright (C) 1994, 1999 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of the libiberty library.
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| 5 | Libiberty is free software; you can redistribute it and/or
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| 6 | modify it under the terms of the GNU Library General Public
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| 7 | License as published by the Free Software Foundation; either
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| 8 | version 2 of the License, or (at your option) any later version.
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| 9 |
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| 10 | Libiberty is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Library General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Library General Public
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| 16 | License along with libiberty; see the file COPYING.LIB. If
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| 17 | not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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| 18 | Boston, MA 02111-1307, USA. */
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| 19 |
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| 20 | #include "config.h"
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| 21 |
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| 22 | #include "ansidecl.h"
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| 23 | #include "libiberty.h"
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| 24 |
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| 25 | /* There are several ways to get elapsed execution time; unfortunately no
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| 26 | single way is available for all host systems, nor are there reliable
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| 27 | ways to find out which way is correct for a given host. */
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| 28 |
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| 29 | #ifdef TIME_WITH_SYS_TIME
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| 30 | # include <sys/time.h>
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| 31 | # include <time.h>
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| 32 | #else
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| 33 | # if HAVE_SYS_TIME_H
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| 34 | # include <sys/time.h>
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| 35 | # else
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| 36 | # ifdef HAVE_TIME_H
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| 37 | # include <time.h>
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| 38 | # endif
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| 39 | # endif
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| 40 | #endif
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| 41 |
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| 42 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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| 43 | #include <sys/resource.h>
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| 44 | #endif
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| 45 |
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| 46 | #ifdef HAVE_TIMES
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| 47 | #ifdef HAVE_SYS_PARAM_H
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| 48 | #include <sys/param.h>
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| 49 | #endif
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| 50 | #include <sys/times.h>
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| 51 | #endif
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| 52 |
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| 53 | #ifdef HAVE_UNISTD_H
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| 54 | #include <unistd.h>
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| 55 | #endif
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| 56 |
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| 57 | /* This is a fallback; if wrong, it will likely make obviously wrong
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| 58 | results. */
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| 59 |
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| 60 | #ifndef CLOCKS_PER_SEC
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| 61 | #define CLOCKS_PER_SEC 1
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| 62 | #endif
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| 63 |
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| 64 | #ifdef _SC_CLK_TCK
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| 65 | #define GNU_HZ sysconf(_SC_CLK_TCK)
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| 66 | #else
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| 67 | #ifdef HZ
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| 68 | #define GNU_HZ HZ
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| 69 | #else
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| 70 | #ifdef CLOCKS_PER_SEC
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| 71 | #define GNU_HZ CLOCKS_PER_SEC
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| 72 | #endif
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| 73 | #endif
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| 74 | #endif
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| 75 |
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| 76 | long
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| 77 | get_run_time ()
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| 78 | {
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| 79 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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| 80 | struct rusage rusage;
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| 81 |
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| 82 | getrusage (0, &rusage);
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| 83 | return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
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| 84 | + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
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| 85 | #else /* ! HAVE_GETRUSAGE */
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| 86 | #ifdef HAVE_TIMES
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| 87 | struct tms tms;
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| 88 |
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| 89 | times (&tms);
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| 90 | return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
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| 91 | #else /* ! HAVE_TIMES */
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| 92 | /* Fall back on clock and hope it's correctly implemented. */
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| 93 | const long clocks_per_sec = CLOCKS_PER_SEC;
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| 94 | if (clocks_per_sec <= 1000000)
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| 95 | return clock () * (1000000 / clocks_per_sec);
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| 96 | else
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| 97 | return clock () / clocks_per_sec;
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| 98 | #endif /* HAVE_TIMES */
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| 99 | #endif /* HAVE_GETRUSAGE */
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| 100 | }
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