libgfortran/intrinsics/dtime.c

   1 /* Implementation of the dtime intrinsic.
   2    Copyright (C) 2004-2015 Free Software Foundation, Inc.
   3
   4 This file is part of the GNU Fortran runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public
   8 License as published by the Free Software Foundation; either
   9 version 3 of the License, or (at your option) any later version.
  10
  11 Libgfortran is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for 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 #include "libgfortran.h"
  26 #include "time_1.h"
  27 #include <gthr.h>
  28
  29 #ifdef __GTHREAD_MUTEX_INIT
  30 static __gthread_mutex_t dtime_update_lock = __GTHREAD_MUTEX_INIT;
  31 #else
  32 static __gthread_mutex_t dtime_update_lock;
  33 #endif
  34
  35 extern void dtime_sub (gfc_array_r4 *t, GFC_REAL_4 *result);
  36 iexport_proto(dtime_sub);
  37
  38 void
  39 dtime_sub (gfc_array_r4 *t, GFC_REAL_4 *result)
  40 {
  41   GFC_REAL_4 *tp;
  42   long user_sec, user_usec, system_sec, system_usec;
  43   static long us = 0, uu = 0, ss = 0 , su = 0;
  44   GFC_REAL_4 tu, ts, tt;
  45
  46   if (((GFC_DESCRIPTOR_EXTENT(t,0))) < 2)
  47     runtime_error ("Insufficient number of elements in TARRAY.");
  48
  49   __gthread_mutex_lock (&dtime_update_lock);
  50   if (gf_cputime (&user_sec, &user_usec, &system_sec, &system_usec) == 0)
  51     {
  52       tu = (GFC_REAL_4) ((user_sec - us) + 1.e-6 * (user_usec - uu));
  53       ts = (GFC_REAL_4) ((system_sec - ss) + 1.e-6 * (system_usec - su));
  54       tt = tu + ts;
  55       us = user_sec;
  56       uu = user_usec;
  57       ss = system_sec;
  58       su = system_usec;
  59     }
  60   else
  61     {
  62       tu = -1;
  63       ts = -1;
  64       tt = -1;
  65     }
  66
  67   tp = t->base_addr;
  68
  69   *tp = tu;
  70   tp += GFC_DESCRIPTOR_STRIDE(t,0);
  71   *tp = ts;
  72   *result = tt;
  73   __gthread_mutex_unlock (&dtime_update_lock);
  74 }
  75 iexport(dtime_sub);
  76
  77 extern GFC_REAL_4 dtime (gfc_array_r4 *t);
  78 export_proto(dtime);
  79
  80 GFC_REAL_4
  81 dtime (gfc_array_r4 *t)
  82 {
  83   GFC_REAL_4 val;
  84   dtime_sub (t, &val);
  85   return val;
  86 }