libgomp/config/posix/time.c

   1 /* Copyright (C) 2005 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 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.
  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 Lesser General Public License for
  14    more details.
  15
  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.  */
  20
  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.  */
  27
  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.
  30
  31    The following implementation uses the most simple POSIX routines.
  32    If present, POSIX 4 clocks should be used instead.  */
  33
  34 #include "libgomp.h"
  35 #include <unistd.h>
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47
  48 double
  49 omp_get_wtime (void)
  50 {
  51 #ifdef HAVE_CLOCK_GETTIME
  52   struct timespec ts;
  53 # ifdef CLOCK_MONOTONIC
  54   if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
  55 # endif
  56     clock_gettime (CLOCK_REALTIME, &ts);
  57   return ts.tv_sec + ts.tv_nsec / 1e9;
  58 #else
  59   struct timeval tv;
  60   gettimeofday (&tv, NULL);
  61   return tv.tv_sec + tv.tv_usec / 1e6;
  62 #endif
  63 }
  64
  65 double
  66 omp_get_wtick (void)
  67 {
  68 #ifdef HAVE_CLOCK_GETTIME
  69   struct timespec ts;
  70 # ifdef CLOCK_MONOTONIC
  71   if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
  72 # endif
  73     clock_getres (CLOCK_REALTIME, &ts);
  74   return ts.tv_sec + ts.tv_nsec / 1e9;
  75 #else
  76   return 1.0 / sysconf(_SC_CLK_TCK);
  77 #endif
  78 }
  79
  80 ialias (omp_get_wtime)
  81 ialias (omp_get_wtick)