1/* Copyright (C) 2005 Free Software Foundation, Inc.
2   Contributed by Richard Henderson <rth@redhat.com>.
3
4   This file is part of the GNU OpenMP Library (libgomp).
5
6   Libgomp is free software; you can redistribute it and/or modify it
7   under the terms of the GNU Lesser General Public License as published by
8   the Free Software Foundation; either version 2.1 of the License, or
9   (at your option) any later version.
10
11   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14   more details.
15
16   You should have received a copy of the GNU Lesser General Public License
17   along with libgomp; see the file COPYING.LIB.  If not, write to the
18   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19   MA 02110-1301, USA.  */
20
21/* As a special exception, if you link this library with other files, some
22   of which are compiled with GCC, to produce an executable, this library
23   does not by itself cause the resulting executable to be covered by the
24   GNU General Public License.  This exception does not however invalidate
25   any other reasons why the executable file might be covered by the GNU
26   General Public License.  */
27
28/* This file contains system specific timer routines.  It is expected that
29   a system may well want to write special versions of each of these.
30
31   The following implementation uses the most simple POSIX routines.
32   If present, POSIX 4 clocks should be used instead.  */
33
34#include "libgomp.h"
35#include <unistd.h>
36#if TIME_WITH_SYS_TIME
37# include <sys/time.h>
38# include <time.h>
39#else
40# if HAVE_SYS_TIME_H
41#  include <sys/time.h>
42# else
43#  include <time.h>
44# endif
45#endif
46
47
48double
49omp_get_wtime (void)
50{
51#ifdef HAVE_CLOCK_GETTIME
52  struct timespec ts;
53# ifdef CLOCK_MONOTONIC
54  if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
55# endif
56    clock_gettime (CLOCK_REALTIME, &ts);
57  return ts.tv_sec + ts.tv_nsec / 1e9;
58#else
59  struct timeval tv;
60  gettimeofday (&tv, NULL);
61  return tv.tv_sec + tv.tv_usec / 1e6;
62#endif
63}
64
65double
66omp_get_wtick (void)
67{
68#ifdef HAVE_CLOCK_GETTIME
69  struct timespec ts;
70# ifdef CLOCK_MONOTONIC
71  if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
72# endif
73    clock_getres (CLOCK_REALTIME, &ts);
74  return ts.tv_sec + ts.tv_nsec / 1e9;
75#else
76  return 1.0 / sysconf(_SC_CLK_TCK);
77#endif
78}
79
80ialias (omp_get_wtime)
81ialias (omp_get_wtick)
82