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jeremybenn |
/* Copyright (C) 2005, 2009 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU OpenMP Library (libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file contains system specific timer routines. It is expected that
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a system may well want to write special versions of each of these.
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The following implementation uses the most simple POSIX routines.
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If present, POSIX 4 clocks should be used instead. */
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#include "libgomp.h"
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#include <unistd.h>
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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double
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omp_get_wtime (void)
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{
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec ts;
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# ifdef CLOCK_MONOTONIC
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if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
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# endif
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clock_gettime (CLOCK_REALTIME, &ts);
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return ts.tv_sec + ts.tv_nsec / 1e9;
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#else
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struct timeval tv;
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gettimeofday (&tv, NULL);
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return tv.tv_sec + tv.tv_usec / 1e6;
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#endif
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}
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double
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omp_get_wtick (void)
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{
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec ts;
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# ifdef CLOCK_MONOTONIC
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if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
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# endif
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clock_getres (CLOCK_REALTIME, &ts);
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return ts.tv_sec + ts.tv_nsec / 1e9;
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#else
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return 1.0 / sysconf(_SC_CLK_TCK);
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#endif
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}
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ialias (omp_get_wtime)
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ialias (omp_get_wtick)
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