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