| 1 | /* Return time used so far, in microseconds. |
| 2 | Copyright (C) 1994, 1999, 2002 Free Software Foundation, Inc. |
| 3 | |
| 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. |
| 9 | |
| 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. |
| 14 | |
| 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. */ |
| 19 | |
| 20 | #include "config.h" |
| 21 | |
| 22 | #include "ansidecl.h" |
| 23 | #include "libiberty.h" |
| 24 | |
| 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> |
| 28 | |
| 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. */ |
| 32 | |
| 33 | #ifdef TIME_WITH_SYS_TIME |
| 34 | # include <sys/time.h> |
| 35 | # include <time.h> |
| 36 | #else |
| 37 | # if HAVE_SYS_TIME_H |
| 38 | # include <sys/time.h> |
| 39 | # else |
| 40 | # ifdef HAVE_TIME_H |
| 41 | # include <time.h> |
| 42 | # endif |
| 43 | # endif |
| 44 | #endif |
| 45 | |
| 46 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
| 47 | #include <sys/resource.h> |
| 48 | #endif |
| 49 | |
| 50 | #ifdef HAVE_TIMES |
| 51 | #ifdef HAVE_SYS_PARAM_H |
| 52 | #include <sys/param.h> |
| 53 | #endif |
| 54 | #include <sys/times.h> |
| 55 | #endif |
| 56 | |
| 57 | #ifdef HAVE_UNISTD_H |
| 58 | #include <unistd.h> |
| 59 | #endif |
| 60 | |
| 61 | /* This is a fallback; if wrong, it will likely make obviously wrong |
| 62 | results. */ |
| 63 | |
| 64 | #ifndef CLOCKS_PER_SEC |
| 65 | #define CLOCKS_PER_SEC 1 |
| 66 | #endif |
| 67 | |
| 68 | #ifdef _SC_CLK_TCK |
| 69 | #define GNU_HZ sysconf(_SC_CLK_TCK) |
| 70 | #else |
| 71 | #ifdef HZ |
| 72 | #define GNU_HZ HZ |
| 73 | #else |
| 74 | #ifdef CLOCKS_PER_SEC |
| 75 | #define GNU_HZ CLOCKS_PER_SEC |
| 76 | #endif |
| 77 | #endif |
| 78 | #endif |
| 79 | |
| 80 | /* |
| 81 | |
| 82 | @deftypefn Replacement long get_run_time (void) |
| 83 | |
| 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 |
| 86 | process started. |
| 87 | |
| 88 | @end deftypefn |
| 89 | |
| 90 | */ |
| 91 | |
| 92 | long |
| 93 | get_run_time () |
| 94 | { |
| 95 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
| 96 | struct rusage rusage; |
| 97 | |
| 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 */ |
| 102 | #ifdef HAVE_TIMES |
| 103 | struct tms tms; |
| 104 | |
| 105 | times (&tms); |
| 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); |
| 112 | else |
| 113 | return clock () / clocks_per_sec; |
| 114 | #endif /* HAVE_TIMES */ |
| 115 | #endif /* HAVE_GETRUSAGE */ |
| 116 | } |