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time.c revision 1.1.1.2 
      1 /* Copyright (C) 2005-2013 Free Software Foundation, Inc.
      2    Contributed by Richard Henderson <rth (at) 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)
     79