1 /* Copyright (C) 2005 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
4 This file is part of the GNU OpenMP Library (libgomp).
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.
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
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. */
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. */
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.
31 The following implementation uses the most simple POSIX routines.
32 If present, POSIX 4 clocks should be used instead. */
36 #if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
51 #ifdef HAVE_CLOCK_GETTIME
53 # ifdef CLOCK_MONOTONIC
54 if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
56 clock_gettime (CLOCK_REALTIME, &ts);
57 return ts.tv_sec + ts.tv_nsec / 1e9;
60 gettimeofday (&tv, NULL);
61 return tv.tv_sec + tv.tv_usec / 1e6;
68 #ifdef HAVE_CLOCK_GETTIME
70 # ifdef CLOCK_MONOTONIC
71 if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
73 clock_getres (CLOCK_REALTIME, &ts);
74 return ts.tv_sec + ts.tv_nsec / 1e9;
76 return 1.0 / sysconf(_SC_CLK_TCK);
80 ialias (omp_get_wtime)
81 ialias (omp_get_wtick)