libgfortran/intrinsics/etime.c

   1 /* Implementation of the ETIME intrinsic.
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3    Contributed by Steven G. Kargl <kargls@comcast.net>.
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  29 Boston, MA 02111-1307, USA.  */
  30
  31 #include "config.h"
  32 #include <sys/types.h>
  33 #include "libgfortran.h"
  34
  35 #include <stdio.h>
  36
  37 #if defined (HAVE_SYS_TIME_H) && defined (HAVE_SYS_RESOURCE_H)
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40 #endif
  41
  42 extern void etime_sub (gfc_array_r4 *t, GFC_REAL_4 *result);
  43 iexport_proto(etime_sub);
  44
  45 void
  46 etime_sub (gfc_array_r4 *t, GFC_REAL_4 *result)
  47 {
  48   GFC_REAL_4 tu, ts, tt, *tp;
  49   index_type dim;
  50
  51 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_SYS_RESOURCE_H)
  52   struct rusage rt;
  53
  54   if (getrusage(RUSAGE_SELF, &rt) == 0)
  55     {
  56       tu = (GFC_REAL_4)(rt.ru_utime.tv_sec + 1.e-6 * rt.ru_utime.tv_usec);
  57       ts = (GFC_REAL_4)(rt.ru_stime.tv_sec + 1.e-6 * rt.ru_stime.tv_usec);
  58       tt = tu + ts;
  59     }
  60   else
  61     {
  62       tu = -1.;
  63       ts = -1.;
  64       tt = -1.;
  65     }
  66 #else
  67   tu = -1.;
  68   ts = -1.;
  69   tt = -1.;
  70 #endif
  71
  72   if (((t->dim[0].ubound + 1 - t->dim[0].lbound)) < 2)
  73     runtime_error ("Insufficient number of elements in TARRAY.");
  74
  75   if (t->dim[0].stride == 0)
  76     t->dim[0].stride = 1;
  77
  78   tp = t->data;
  79
  80   *tp = tu;
  81   tp += t->dim[0].stride;
  82   *tp = ts;
  83   *result = tt;
  84 }
  85 iexport(etime_sub);
  86
  87 extern GFC_REAL_4 etime (gfc_array_r4 *t);
  88 export_proto(etime);
  89
  90 GFC_REAL_4
  91 etime (gfc_array_r4 *t)
  92 {
  93   GFC_REAL_4 val;
  94   etime_sub (t, &val);
  95   return val;
  96 }
  97
  98 /* LAPACK's test programs declares ETIME external, therefore we
  99    need this.  */
 100
 101 extern GFC_REAL_4 etime_ (GFC_REAL_4 *t);
 102 export_proto_np(etime_);
 103
 104 GFC_REAL_4
 105 etime_ (GFC_REAL_4 *t)
 106 {
 107   gfc_array_r4 desc;
 108   GFC_REAL_4 val;
 109
 110   /* We only fill in the fields that are used in etime_sub.  */
 111   desc.dim[0].lbound = 0;
 112   desc.dim[0].ubound = 1;
 113   desc.dim[0].stride = 1;
 114   desc.data = t;
 115
 116   etime_sub (&desc, &val);
 117   return val;
 118 }