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1 | /* Return time used so far, in microseconds. | |
2 | Copyright (C) 1994 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 "ansidecl.h" | |
21 | #include "libiberty.h" | |
22 | ||
23 | /* There are several ways to get elapsed execution time; unfortunately no | |
24 | single way is available for all host systems, nor are there reliable | |
25 | ways to find out which way is correct for a given host. */ | |
26 | ||
27 | #include <time.h> | |
28 | ||
29 | /* These should go away when libiberty uses autoconf. */ | |
30 | ||
31 | #if defined(__sun__) && !defined(__svr4__) | |
32 | #define HAVE_GETRUSAGE | |
33 | #endif | |
34 | ||
35 | #ifdef HAVE_SYSCONF | |
36 | #define HAVE_TIMES | |
37 | #endif | |
38 | ||
39 | #ifdef HAVE_GETRUSAGE | |
40 | #include <sys/time.h> | |
41 | #include <sys/resource.h> | |
42 | #endif | |
43 | ||
44 | #ifdef HAVE_TIMES | |
45 | #ifndef NO_SYS_PARAM_H | |
46 | #include <sys/param.h> | |
47 | #endif | |
48 | #include <sys/times.h> | |
49 | #endif | |
50 | ||
51 | /* This is a fallback; if wrong, it will likely make obviously wrong | |
52 | results. */ | |
53 | ||
54 | #ifndef CLOCKS_PER_SEC | |
55 | #define CLOCKS_PER_SEC 1 | |
56 | #endif | |
57 | ||
58 | long | |
59 | get_run_time () | |
60 | { | |
61 | #ifdef HAVE_GETRUSAGE | |
62 | struct rusage rusage; | |
63 | ||
64 | getrusage (0, &rusage); | |
65 | return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec | |
66 | + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec); | |
67 | #else /* ! HAVE_GETRUSAGE */ | |
68 | #ifdef HAVE_TIMES | |
69 | struct tms tms; | |
70 | ||
71 | times (&tms); | |
72 | return (tms.tms_utime + tms.tms_stime) * (1000000 / HZ); | |
73 | #else /* ! HAVE_TIMES */ | |
74 | /* Fall back on clock and hope it's correctly implemented. */ | |
75 | const long clocks_per_sec = CLOCKS_PER_SEC; | |
76 | if (clocks_per_sec <= 1000000) | |
77 | return clock () * (1000000 / clocks_per_sec); | |
78 | else | |
79 | return clock () / clocks_per_sec; | |
80 | #endif /* HAVE_TIMES */ | |
81 | #endif /* HAVE_GETRUSAGE */ | |
82 | } |