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5191 | serge | 1 | /* Return time used so far, in microseconds. |
2 | Copyright (C) 1994, 1999, 2002 Free Software Foundation, Inc. |
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3 | |||
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 | |||
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 | |||
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 | |||
20 | #include "config.h" |
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21 | |||
22 | #include "ansidecl.h" |
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23 | #include "libiberty.h" |
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24 | |||
25 | /* On some systems (such as WindISS), you must include |
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26 | to get the definition of "time_t" before you include |
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27 | #include |
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28 | |||
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 | |||
33 | #ifdef TIME_WITH_SYS_TIME |
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34 | # include |
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35 | # include |
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36 | #else |
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37 | # if HAVE_SYS_TIME_H |
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38 | # include |
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39 | # else |
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40 | # ifdef HAVE_TIME_H |
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41 | # include |
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42 | # endif |
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43 | # endif |
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44 | #endif |
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45 | |||
46 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
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47 | #include |
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48 | #endif |
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49 | |||
50 | #ifdef HAVE_TIMES |
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51 | #ifdef HAVE_SYS_PARAM_H |
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52 | #include |
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53 | #endif |
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54 | #include |
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55 | #endif |
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56 | |||
57 | #ifdef HAVE_UNISTD_H |
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58 | #include |
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59 | #endif |
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60 | |||
61 | /* This is a fallback; if wrong, it will likely make obviously wrong |
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62 | results. */ |
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63 | |||
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 | |||
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 | |||
80 | /* |
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81 | |||
82 | @deftypefn Replacement long get_run_time (void) |
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83 | |||
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 | |||
88 | @end deftypefn |
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89 | |||
90 | */ |
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91 | |||
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 | |||
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 | |||
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 | }=> |