libgfortran/intrinsics/system_clock.c

   1 /* Implementation of the SYSTEM_CLOCK intrinsic.
   2    Copyright (C) 2004, 2005, 2007, 2009 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
  27 #include <limits.h>
  28
  29 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
  30 #  include <sys/time.h>
  31 #elif defined(HAVE_TIME_H)
  32 #  include <time.h>
  33 #  define TCK 1
  34 #else
  35 #define TCK 0
  36 #endif
  37
  38
  39 extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *);
  40 export_proto(system_clock_4);
  41
  42 extern void system_clock_8 (GFC_INTEGER_8 *, GFC_INTEGER_8 *, GFC_INTEGER_8 *);
  43 export_proto(system_clock_8);
  44
  45
  46 /* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK
  47    intrinsic subroutine.  It returns the number of clock ticks for the current
  48    system time, the number of ticks per second, and the maximum possible value
  49    for COUNT.  On the first call to SYSTEM_CLOCK, COUNT is set to zero. */
  50
  51 void
  52 system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
  53                GFC_INTEGER_4 *count_max)
  54 {
  55   GFC_INTEGER_4 cnt;
  56   GFC_INTEGER_4 mx;
  57
  58 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
  59 #undef TCK
  60 #define TCK 1000
  61   struct timeval tp1;
  62
  63   if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
  64     internal_error (NULL, "tv_sec too small");
  65
  66   if (gettimeofday(&tp1, NULL) == 0)
  67     {
  68       GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
  69       ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
  70       if (ucnt > GFC_INTEGER_4_HUGE)
  71         cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
  72       else
  73         cnt = ucnt;
  74       mx = GFC_INTEGER_4_HUGE;
  75     }
  76   else
  77     {
  78       if (count != NULL)
  79         *count = - GFC_INTEGER_4_HUGE;
  80       if (count_rate != NULL)
  81         *count_rate = 0;
  82       if (count_max != NULL)
  83         *count_max = 0;
  84       return;
  85     }
  86 #elif defined(HAVE_TIME_H)
  87   GFC_UINTEGER_4 ucnt;
  88
  89   if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
  90     internal_error (NULL, "time_t too small");
  91
  92   ucnt = time (NULL);
  93   if (ucnt > GFC_INTEGER_4_HUGE)
  94     cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
  95   else
  96     cnt = ucnt;
  97   mx = GFC_INTEGER_4_HUGE;
  98 #else
  99   cnt = - GFC_INTEGER_4_HUGE;
 100   mx = 0;
 101 #endif
 102   if (count != NULL)
 103     *count = cnt;
 104   if (count_rate != NULL)
 105     *count_rate = TCK;
 106   if (count_max != NULL)
 107     *count_max = mx;
 108 }
 109
 110
 111 /* INTEGER(8) version of the above routine.  */
 112
 113 void
 114 system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
 115                 GFC_INTEGER_8 *count_max)
 116 {
 117   GFC_INTEGER_8 cnt;
 118   GFC_INTEGER_8 mx;
 119
 120 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
 121 #undef TCK
 122 #define TCK 1000000
 123   struct timeval tp1;
 124
 125   if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
 126     internal_error (NULL, "tv_sec too small");
 127
 128   if (gettimeofday(&tp1, NULL) == 0)
 129     {
 130       if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
 131         {
 132           GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
 133           ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
 134           if (ucnt > GFC_INTEGER_4_HUGE)
 135             cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
 136           else
 137             cnt = ucnt;
 138           mx = GFC_INTEGER_4_HUGE;
 139         }
 140       else
 141         {
 142           GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
 143           ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
 144           if (ucnt > GFC_INTEGER_8_HUGE)
 145             cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
 146           else
 147             cnt = ucnt;
 148           mx = GFC_INTEGER_8_HUGE;
 149         }
 150     }
 151   else
 152     {
 153       if (count != NULL)
 154         *count = - GFC_INTEGER_8_HUGE;
 155       if (count_rate != NULL)
 156         *count_rate = 0;
 157       if (count_max != NULL)
 158         *count_max = 0;
 159
 160       return;
 161     }
 162 #elif defined(HAVE_TIME_H)
 163   if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
 164     internal_error (NULL, "time_t too small");
 165   else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
 166     {
 167       GFC_UINTEGER_4 ucnt = time (NULL);
 168       if (ucnt > GFC_INTEGER_4_HUGE)
 169         cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
 170       else
 171         cnt = ucnt;
 172       mx = GFC_INTEGER_4_HUGE;
 173     }
 174   else
 175     {
 176       GFC_UINTEGER_8 ucnt = time (NULL);
 177       if (ucnt > GFC_INTEGER_8_HUGE)
 178         cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
 179       else
 180         cnt = ucnt;
 181       mx = GFC_INTEGER_8_HUGE;
 182     }
 183 #else
 184   cnt = - GFC_INTEGER_8_HUGE;
 185   mx = 0;
 186 #endif
 187   if (count != NULL)
 188     *count = cnt;
 189   if (count_rate != NULL)
 190     *count_rate = TCK;
 191   if (count_max != NULL)
 192     *count_max = mx;
 193 }