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., 51 Franklin Street - Fifth Floor, 18 Boston, MA 02110-1301, 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 #ifndef RUSAGE_SELF 69 #define RUSAGE_SELF 0 70 #endif 71 72 #ifdef _SC_CLK_TCK 73 #define GNU_HZ sysconf(_SC_CLK_TCK) 74 #else 75 #ifdef HZ 76 #define GNU_HZ HZ 77 #else 78 #ifdef CLOCKS_PER_SEC 79 #define GNU_HZ CLOCKS_PER_SEC 80 #endif 81 #endif 82 #endif 83 84 /* 85 86 @deftypefn Replacement long get_run_time (void) 87 88 Returns the time used so far, in microseconds. If possible, this is 89 the time used by this process, else it is the elapsed time since the 90 process started. 91 92 @end deftypefn 93 94 */ 95 96 long 97 get_run_time (void) 98 { 99 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) 100 struct rusage rusage; 101 102 getrusage (RUSAGE_SELF, &rusage); 103 return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec 104 + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec); 105 #else /* ! HAVE_GETRUSAGE */ 106 #ifdef HAVE_TIMES 107 struct tms tms; 108 109 times (&tms); 110 return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ); 111 #else /* ! HAVE_TIMES */ 112 /* Fall back on clock and hope it's correctly implemented. */ 113 const long clocks_per_sec = CLOCKS_PER_SEC; 114 if (clocks_per_sec <= 1000000) 115 return clock () * (1000000 / clocks_per_sec); 116 else 117 return clock () / clocks_per_sec; 118 #endif /* HAVE_TIMES */ 119 #endif /* HAVE_GETRUSAGE */ 120 } 121
