libgomp/config/posix/time.c

   1 /* Copyright (C) 2005-2013 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU OpenMP Library (libgomp).
   5
   6    Libgomp is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  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 General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 /* This file contains system specific timer routines.  It is expected that
  26    a system may well want to write special versions of each of these.
  27
  28    The following implementation uses the most simple POSIX routines.
  29    If present, POSIX 4 clocks should be used instead.  */
  30
  31 #include "libgomp.h"
  32 #include <unistd.h>
  33 #if TIME_WITH_SYS_TIME
  34 # include <sys/time.h>
  35 # include <time.h>
  36 #else
  37 # if HAVE_SYS_TIME_H
  38 #  include <sys/time.h>
  39 # else
  40 #  include <time.h>
  41 # endif
  42 #endif
  43
  44
  45 double
  46 omp_get_wtime (void)
  47 {
  48 #ifdef HAVE_CLOCK_GETTIME
  49   struct timespec ts;
  50 # ifdef CLOCK_MONOTONIC
  51   if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
  52 # endif
  53     clock_gettime (CLOCK_REALTIME, &ts);
  54   return ts.tv_sec + ts.tv_nsec / 1e9;
  55 #else
  56   struct timeval tv;
  57   gettimeofday (&tv, NULL);
  58   return tv.tv_sec + tv.tv_usec / 1e6;
  59 #endif
  60 }
  61
  62 double
  63 omp_get_wtick (void)
  64 {
  65 #ifdef HAVE_CLOCK_GETTIME
  66   struct timespec ts;
  67 # ifdef CLOCK_MONOTONIC
  68   if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
  69 # endif
  70     clock_getres (CLOCK_REALTIME, &ts);
  71   return ts.tv_sec + ts.tv_nsec / 1e9;
  72 #else
  73   return 1.0 / sysconf(_SC_CLK_TCK);
  74 #endif
  75 }
  76
  77 ialias (omp_get_wtime)
  78 ialias (omp_get_wtick)