1 /* Copyright (C) 2005-2018 Free Software Foundation, Inc.
2    Contributed by Richard Henderson <rth@redhat.com>.
3 
4    This file is part of the GNU Offloading and Multi Processing Library
5    (libgomp).
6 
7    Libgomp is free software; you can redistribute it and/or modify it
8    under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3, or (at your option)
10    any later version.
11 
12    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15    more details.
16 
17    Under Section 7 of GPL version 3, you are granted additional
18    permissions described in the GCC Runtime Library Exception, version
19    3.1, as published by the Free Software Foundation.
20 
21    You should have received a copy of the GNU General Public License and
22    a copy of the GCC Runtime Library Exception along with this program;
23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24    <http://www.gnu.org/licenses/>.  */
25 
26 /* This file contains system specific timer routines.  It is expected that
27    a system may well want to write special versions of each of these.
28 
29    The following implementation uses the most simple POSIX routines.
30    If present, POSIX 4 clocks should be used instead.  */
31 
32 #include "libgomp.h"
33 #include <unistd.h>
34 #if TIME_WITH_SYS_TIME
35 # include <sys/time.h>
36 # include <time.h>
37 #else
38 # if HAVE_SYS_TIME_H
39 #  include <sys/time.h>
40 # else
41 #  include <time.h>
42 # endif
43 #endif
44 
45 
46 double
47 omp_get_wtime (void)
48 {
49 #ifdef HAVE_CLOCK_GETTIME
50   struct timespec ts;
51 # ifdef CLOCK_MONOTONIC
52   if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
53 # endif
54     clock_gettime (CLOCK_REALTIME, &ts);
55   return ts.tv_sec + ts.tv_nsec / 1e9;
56 #else
57   struct timeval tv;
58   gettimeofday (&tv, NULL);
59   return tv.tv_sec + tv.tv_usec / 1e6;
60 #endif
61 }
62 
63 double
64 omp_get_wtick (void)
65 {
66 #ifdef HAVE_CLOCK_GETTIME
67   struct timespec ts;
68 # ifdef CLOCK_MONOTONIC
69   if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
70 # endif
71     clock_getres (CLOCK_REALTIME, &ts);
72   return ts.tv_sec + ts.tv_nsec / 1e9;
73 #else
74   return 1.0 / sysconf(_SC_CLK_TCK);
75 #endif
76 }
77 
78 ialias (omp_get_wtime)
79 ialias (omp_get_wtick)
80