xref: /openbsd-src/gnu/gcc/libgomp/config/posix/time.c (revision 404b540a9034ac75a6199ad1a32d1bbc7a0d4210)
1*404b540aSrobert /* Copyright (C) 2005 Free Software Foundation, Inc.
2*404b540aSrobert    Contributed by Richard Henderson <rth@redhat.com>.
3*404b540aSrobert 
4*404b540aSrobert    This file is part of the GNU OpenMP Library (libgomp).
5*404b540aSrobert 
6*404b540aSrobert    Libgomp is free software; you can redistribute it and/or modify it
7*404b540aSrobert    under the terms of the GNU Lesser General Public License as published by
8*404b540aSrobert    the Free Software Foundation; either version 2.1 of the License, or
9*404b540aSrobert    (at your option) any later version.
10*404b540aSrobert 
11*404b540aSrobert    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12*404b540aSrobert    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13*404b540aSrobert    FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14*404b540aSrobert    more details.
15*404b540aSrobert 
16*404b540aSrobert    You should have received a copy of the GNU Lesser General Public License
17*404b540aSrobert    along with libgomp; see the file COPYING.LIB.  If not, write to the
18*404b540aSrobert    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19*404b540aSrobert    MA 02110-1301, USA.  */
20*404b540aSrobert 
21*404b540aSrobert /* As a special exception, if you link this library with other files, some
22*404b540aSrobert    of which are compiled with GCC, to produce an executable, this library
23*404b540aSrobert    does not by itself cause the resulting executable to be covered by the
24*404b540aSrobert    GNU General Public License.  This exception does not however invalidate
25*404b540aSrobert    any other reasons why the executable file might be covered by the GNU
26*404b540aSrobert    General Public License.  */
27*404b540aSrobert 
28*404b540aSrobert /* This file contains system specific timer routines.  It is expected that
29*404b540aSrobert    a system may well want to write special versions of each of these.
30*404b540aSrobert 
31*404b540aSrobert    The following implementation uses the most simple POSIX routines.
32*404b540aSrobert    If present, POSIX 4 clocks should be used instead.  */
33*404b540aSrobert 
34*404b540aSrobert #include "libgomp.h"
35*404b540aSrobert #include <unistd.h>
36*404b540aSrobert #if TIME_WITH_SYS_TIME
37*404b540aSrobert # include <sys/time.h>
38*404b540aSrobert # include <time.h>
39*404b540aSrobert #else
40*404b540aSrobert # if HAVE_SYS_TIME_H
41*404b540aSrobert #  include <sys/time.h>
42*404b540aSrobert # else
43*404b540aSrobert #  include <time.h>
44*404b540aSrobert # endif
45*404b540aSrobert #endif
46*404b540aSrobert 
47*404b540aSrobert 
48*404b540aSrobert double
omp_get_wtime(void)49*404b540aSrobert omp_get_wtime (void)
50*404b540aSrobert {
51*404b540aSrobert #ifdef HAVE_CLOCK_GETTIME
52*404b540aSrobert   struct timespec ts;
53*404b540aSrobert # ifdef CLOCK_MONOTONIC
54*404b540aSrobert   if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
55*404b540aSrobert # endif
56*404b540aSrobert     clock_gettime (CLOCK_REALTIME, &ts);
57*404b540aSrobert   return ts.tv_sec + ts.tv_nsec / 1e9;
58*404b540aSrobert #else
59*404b540aSrobert   struct timeval tv;
60*404b540aSrobert   gettimeofday (&tv, NULL);
61*404b540aSrobert   return tv.tv_sec + tv.tv_usec / 1e6;
62*404b540aSrobert #endif
63*404b540aSrobert }
64*404b540aSrobert 
65*404b540aSrobert double
omp_get_wtick(void)66*404b540aSrobert omp_get_wtick (void)
67*404b540aSrobert {
68*404b540aSrobert #ifdef HAVE_CLOCK_GETTIME
69*404b540aSrobert   struct timespec ts;
70*404b540aSrobert # ifdef CLOCK_MONOTONIC
71*404b540aSrobert   if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
72*404b540aSrobert # endif
73*404b540aSrobert     clock_getres (CLOCK_REALTIME, &ts);
74*404b540aSrobert   return ts.tv_sec + ts.tv_nsec / 1e9;
75*404b540aSrobert #else
76*404b540aSrobert   return 1.0 / sysconf(_SC_CLK_TCK);
77*404b540aSrobert #endif
78*404b540aSrobert }
79*404b540aSrobert 
80*404b540aSrobert ialias (omp_get_wtime)
81*404b540aSrobert ialias (omp_get_wtick)
82