1/* Copyright (C) 2005-2020 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
46double
47omp_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
63double
64omp_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
78ialias (omp_get_wtime)
79ialias (omp_get_wtick)
80