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time.c revision 1.6 
      1  1.6  mrg /* Copyright (C) 2005-2016 Free Software Foundation, Inc.
      2  1.1  mrg    Contributed by Richard Henderson <rth (at) redhat.com>.
      3  1.1  mrg 
      4  1.5  mrg    This file is part of the GNU Offloading and Multi Processing Library
      5  1.5  mrg    (libgomp).
      6  1.1  mrg 
      7  1.1  mrg    Libgomp is free software; you can redistribute it and/or modify it
      8  1.1  mrg    under the terms of the GNU General Public License as published by
      9  1.1  mrg    the Free Software Foundation; either version 3, or (at your option)
     10  1.1  mrg    any later version.
     11  1.1  mrg 
     12  1.1  mrg    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
     13  1.1  mrg    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     14  1.1  mrg    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
     15  1.1  mrg    more details.
     16  1.1  mrg 
     17  1.1  mrg    Under Section 7 of GPL version 3, you are granted additional
     18  1.1  mrg    permissions described in the GCC Runtime Library Exception, version
     19  1.1  mrg    3.1, as published by the Free Software Foundation.
     20  1.1  mrg 
     21  1.1  mrg    You should have received a copy of the GNU General Public License and
     22  1.1  mrg    a copy of the GCC Runtime Library Exception along with this program;
     23  1.1  mrg    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24  1.1  mrg    <http://www.gnu.org/licenses/>.  */
     25  1.1  mrg 
     26  1.1  mrg /* This file contains system specific timer routines.  It is expected that
     27  1.1  mrg    a system may well want to write special versions of each of these.
     28  1.1  mrg 
     29  1.1  mrg    The following implementation uses the most simple POSIX routines.
     30  1.1  mrg    If present, POSIX 4 clocks should be used instead.  */
     31  1.1  mrg 
     32  1.1  mrg #include "libgomp.h"
     33  1.1  mrg #include <unistd.h>
     34  1.1  mrg #if TIME_WITH_SYS_TIME
     35  1.1  mrg # include <sys/time.h>
     36  1.1  mrg # include <time.h>
     37  1.1  mrg #else
     38  1.1  mrg # if HAVE_SYS_TIME_H
     39  1.1  mrg #  include <sys/time.h>
     40  1.1  mrg # else
     41  1.1  mrg #  include <time.h>
     42  1.1  mrg # endif
     43  1.1  mrg #endif
     44  1.1  mrg 
     45  1.1  mrg 
     46  1.1  mrg double
     47  1.1  mrg omp_get_wtime (void)
     48  1.1  mrg {
     49  1.1  mrg #ifdef HAVE_CLOCK_GETTIME
     50  1.1  mrg   struct timespec ts;
     51  1.1  mrg # ifdef CLOCK_MONOTONIC
     52  1.1  mrg   if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
     53  1.1  mrg # endif
     54  1.1  mrg     clock_gettime (CLOCK_REALTIME, &ts);
     55  1.1  mrg   return ts.tv_sec + ts.tv_nsec / 1e9;
     56  1.1  mrg #else
     57  1.1  mrg   struct timeval tv;
     58  1.1  mrg   gettimeofday (&tv, NULL);
     59  1.1  mrg   return tv.tv_sec + tv.tv_usec / 1e6;
     60  1.1  mrg #endif
     61  1.1  mrg }
     62  1.1  mrg 
     63  1.1  mrg double
     64  1.1  mrg omp_get_wtick (void)
     65  1.1  mrg {
     66  1.1  mrg #ifdef HAVE_CLOCK_GETTIME
     67  1.1  mrg   struct timespec ts;
     68  1.1  mrg # ifdef CLOCK_MONOTONIC
     69  1.1  mrg   if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
     70  1.1  mrg # endif
     71  1.1  mrg     clock_getres (CLOCK_REALTIME, &ts);
     72  1.1  mrg   return ts.tv_sec + ts.tv_nsec / 1e9;
     73  1.1  mrg #else
     74  1.1  mrg   return 1.0 / sysconf(_SC_CLK_TCK);
     75  1.1  mrg #endif
     76  1.1  mrg }
     77  1.1  mrg 
     78  1.1  mrg ialias (omp_get_wtime)
     79  1.1  mrg ialias (omp_get_wtick)
     80