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252b5132 RH |
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 | ||
62df2065 JL |
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 | |
252b5132 | 41 | |
33fbbfbc | 42 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
252b5132 RH |
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 | ||
ba19b94f DD |
76 | /* |
77 | ||
5d852400 | 78 | @deftypefn Replacement long get_run_time (void) |
ba19b94f DD |
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 | ||
252b5132 RH |
88 | long |
89 | get_run_time () | |
90 | { | |
33fbbfbc | 91 | #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
252b5132 RH |
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 | } |