1 /* Return time used so far, in microseconds. 2 Copyright (C) 1994, 1999 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 /* 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. */ 28 29 #ifdef TIME_WITH_SYS_TIME 30 # include <sys/time.h> 31 # include <time.h> 32 #else 33 # if HAVE_SYS_TIME_H 34 # include <sys/time.h> 35 # else 36 # ifdef HAVE_TIME_H 37 # include <time.h> 38 # endif 39 # endif 40 #endif 41 42 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) 43 #include <sys/resource.h> 44 #endif 45 46 #ifdef HAVE_TIMES 47 #ifdef HAVE_SYS_PARAM_H 48 #include <sys/param.h> 49 #endif 50 #include <sys/times.h> 51 #endif 52 53 #ifdef HAVE_UNISTD_H 54 #include <unistd.h> 55 #endif 56 57 /* This is a fallback; if wrong, it will likely make obviously wrong 58 results. */ 59 60 #ifndef CLOCKS_PER_SEC 61 #define CLOCKS_PER_SEC 1 62 #endif 63 64 #ifdef _SC_CLK_TCK 65 #define GNU_HZ sysconf(_SC_CLK_TCK) 66 #else 67 #ifdef HZ 68 #define GNU_HZ HZ 69 #else 70 #ifdef CLOCKS_PER_SEC 71 #define GNU_HZ CLOCKS_PER_SEC 72 #endif 73 #endif 74 #endif 75 76 /* 77 78 @deftypefn Replacement long get_run_time (void) 79 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 82 process started. 83 84 @end deftypefn 85 86 */ 87 88 long 89 get_run_time () 90 { 91 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) 92 struct rusage rusage; 93 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 */ 98 #ifdef HAVE_TIMES 99 struct tms tms; 100 101 times (&tms); 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); 108 else 109 return clock () / clocks_per_sec; 110 #endif /* HAVE_TIMES */ 111 #endif /* HAVE_GETRUSAGE */ 112 } 113