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1 /* Return time used so far, in microseconds.
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2 Copyright (C) 1994, 1999, 2002 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., 51 Franklin Street - Fifth Floor,
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18 Boston, MA 02110-1301, 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 /* On some systems (such as WindISS), you must include <sys/types.h>
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26 to get the definition of "time_t" before you include <time.h>. */
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27 #include <sys/types.h>
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28
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29 /* There are several ways to get elapsed execution time; unfortunately no
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30 single way is available for all host systems, nor are there reliable
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31 ways to find out which way is correct for a given host. */
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32
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33 #ifdef TIME_WITH_SYS_TIME
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34 # include <sys/time.h>
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35 # include <time.h>
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36 #else
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37 # if HAVE_SYS_TIME_H
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38 # include <sys/time.h>
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39 # else
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40 # ifdef HAVE_TIME_H
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41 # include <time.h>
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42 # endif
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43 # endif
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44 #endif
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45
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46 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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47 #include <sys/resource.h>
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48 #endif
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49
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50 #ifdef HAVE_TIMES
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51 #ifdef HAVE_SYS_PARAM_H
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52 #include <sys/param.h>
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53 #endif
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54 #include <sys/times.h>
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55 #endif
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56
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57 #ifdef HAVE_UNISTD_H
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58 #include <unistd.h>
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59 #endif
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60
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61 /* This is a fallback; if wrong, it will likely make obviously wrong
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62 results. */
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63
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64 #ifndef CLOCKS_PER_SEC
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65 #define CLOCKS_PER_SEC 1
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66 #endif
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67
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68 #ifdef _SC_CLK_TCK
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69 #define GNU_HZ sysconf(_SC_CLK_TCK)
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70 #else
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71 #ifdef HZ
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72 #define GNU_HZ HZ
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73 #else
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74 #ifdef CLOCKS_PER_SEC
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75 #define GNU_HZ CLOCKS_PER_SEC
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76 #endif
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77 #endif
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78 #endif
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79
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80 /*
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81
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82 @deftypefn Replacement long get_run_time (void)
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83
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84 Returns the time used so far, in microseconds. If possible, this is
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85 the time used by this process, else it is the elapsed time since the
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86 process started.
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87
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88 @end deftypefn
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89
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90 */
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91
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92 long
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93 get_run_time (void)
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94 {
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95 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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96 struct rusage rusage;
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97
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98 getrusage (0, &rusage);
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99 return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
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100 + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
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101 #else /* ! HAVE_GETRUSAGE */
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102 #ifdef HAVE_TIMES
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103 struct tms tms;
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104
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105 times (&tms);
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106 return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
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107 #else /* ! HAVE_TIMES */
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108 /* Fall back on clock and hope it's correctly implemented. */
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109 const long clocks_per_sec = CLOCKS_PER_SEC;
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110 if (clocks_per_sec <= 1000000)
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111 return clock () * (1000000 / clocks_per_sec);
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112 else
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113 return clock () / clocks_per_sec;
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114 #endif /* HAVE_TIMES */
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115 #endif /* HAVE_GETRUSAGE */
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116 }
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