1  /* Copyright (C) 2005-2023 Free Software Foundation, Inc.
       2     Contributed by Richard Henderson <rth@redhat.com>.
       3  
       4     This file is part of the GNU Offloading and Multi Processing Library
       5     (libgomp).
       6  
       7     Libgomp is free software; you can redistribute it and/or modify it
       8     under the terms of the GNU General Public License as published by
       9     the Free Software Foundation; either version 3, or (at your option)
      10     any later version.
      11  
      12     Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
      13     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      14     FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
      15     more details.
      16  
      17     Under Section 7 of GPL version 3, you are granted additional
      18     permissions described in the GCC Runtime Library Exception, version
      19     3.1, as published by the Free Software Foundation.
      20  
      21     You should have received a copy of the GNU General Public License and
      22     a copy of the GCC Runtime Library Exception along with this program;
      23     see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24     <http://www.gnu.org/licenses/>.  */
      25  
      26  /* This file contains system specific timer routines.  It is expected that
      27     a system may well want to write special versions of each of these.
      28  
      29     The following implementation uses the most simple POSIX routines.
      30     If present, POSIX 4 clocks should be used instead.  */
      31  
      32  #include "libgomp.h"
      33  #include <unistd.h>
      34  #if TIME_WITH_SYS_TIME
      35  # include <sys/time.h>
      36  # include <time.h>
      37  #else
      38  # if HAVE_SYS_TIME_H
      39  #  include <sys/time.h>
      40  # else
      41  #  include <time.h>
      42  # endif
      43  #endif
      44  
      45  
      46  double
      47  omp_get_wtime (void)
      48  {
      49  #ifdef HAVE_CLOCK_GETTIME
      50    struct timespec ts;
      51  # ifdef CLOCK_MONOTONIC
      52    if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0)
      53  # endif
      54      clock_gettime (CLOCK_REALTIME, &ts);
      55    return ts.tv_sec + ts.tv_nsec / 1e9;
      56  #else
      57    struct timeval tv;
      58    gettimeofday (&tv, NULL);
      59    return tv.tv_sec + tv.tv_usec / 1e6;
      60  #endif
      61  }
      62  
      63  double
      64  omp_get_wtick (void)
      65  {
      66  #ifdef HAVE_CLOCK_GETTIME
      67    struct timespec ts;
      68  # ifdef CLOCK_MONOTONIC
      69    if (clock_getres (CLOCK_MONOTONIC, &ts) < 0)
      70  # endif
      71      clock_getres (CLOCK_REALTIME, &ts);
      72    return ts.tv_sec + ts.tv_nsec / 1e9;
      73  #else
      74    return 1.0 / sysconf(_SC_CLK_TCK);
      75  #endif
      76  }
      77  
      78  ialias (omp_get_wtime)
      79  ialias (omp_get_wtick)