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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)