libf2c/libU77/dtime_.c

   1 /* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of GNU Fortran libU77 library.
   3
   4 This library is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU Library General Public License as published
   6 by the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 GNU Fortran is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with GNU Fortran; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22 #if HAVE_STDLIB_H
  23 #  include <stdlib.h>
  24 #endif
  25 #if HAVE_UNISTD_H
  26 #  include <unistd.h>
  27 #endif
  28 #include <sys/types.h>
  29 #if HAVE_SYS_TIMES_H
  30 #  include <sys/times.h>
  31 #endif
  32 #if HAVE_SYS_PARAM_H
  33 #  include <sys/param.h>
  34 #endif
  35 #if HAVE_GETRUSAGE
  36 #  include <sys/time.h>
  37 #  include <sys/resource.h>
  38 #endif
  39 #if defined (_WIN32)
  40 #  include <windows.h>
  41 #  undef min
  42 #  undef max
  43 #endif
  44 #include <errno.h>              /* for ENOSYS */
  45 #include "f2c.h"
  46
  47 double
  48 G77_dtime_0 (real tarray[2])
  49 {
  50 #if defined (_WIN32)
  51   static int win32_platform = -1;
  52
  53   if (win32_platform == -1)
  54     {
  55       OSVERSIONINFO osv;
  56       osv.dwOSVersionInfoSize = sizeof (osv);
  57       GetVersionEx (&osv);
  58       win32_platform = osv.dwPlatformId;
  59     }
  60
  61   /* We need to use this hack on non-NT platforms, where the first call
  62      returns 0.0 and subsequent ones return the correct value. */
  63   if (win32_platform != VER_PLATFORM_WIN32_NT)
  64     {
  65       static unsigned long long clock_freq;
  66       static unsigned long long old_count;
  67       unsigned long long count;
  68       double delta;
  69       LARGE_INTEGER counter_val;
  70
  71       if (clock_freq == 0)
  72         {
  73           LARGE_INTEGER freq;
  74           if (!QueryPerformanceFrequency (&freq))
  75             {
  76               errno = ENOSYS;
  77               return 0.0;
  78             }
  79           else
  80             {
  81               clock_freq = ((unsigned long long) freq.HighPart << 32)
  82                 + ((unsigned) freq.LowPart);
  83             }
  84         }
  85
  86       if (!QueryPerformanceCounter (&counter_val))
  87         return -1.0;
  88
  89       count = ((unsigned long long) counter_val.HighPart << 32)
  90         + (unsigned) counter_val.LowPart;
  91       delta = ((double) (count - old_count)) / clock_freq;
  92       tarray[0] = (float) delta;
  93       tarray[1] = 0.0;
  94       old_count = count;
  95     }
  96   else
  97     {
  98       static unsigned long long old_utime, old_stime;
  99       unsigned long long utime, stime;
 100       FILETIME creation_time, exit_time, kernel_time, user_time;
 101
 102       GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
 103                        &kernel_time, &user_time);
 104       utime = ((unsigned long long) user_time.dwHighDateTime << 32)
 105         + (unsigned) user_time.dwLowDateTime;
 106       stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
 107         + (unsigned) kernel_time.dwLowDateTime;
 108
 109       tarray[0] = (utime - old_utime) / 1.0e7;
 110       tarray[1] = (stime - old_stime) / 1.0e7;
 111       old_utime = utime;
 112       old_stime = stime;
 113     }
 114   return tarray[0] + tarray[1];
 115
 116 #elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
 117   /* The getrusage version is only the default for convenience. */
 118 #ifdef HAVE_GETRUSAGE
 119   float utime, stime;
 120   static float old_utime = 0.0, old_stime = 0.0;
 121   struct rusage rbuff;
 122
 123   if (getrusage (RUSAGE_SELF, &rbuff) != 0)
 124     abort ();
 125   utime = (float) (rbuff.ru_utime).tv_sec +
 126     (float) (rbuff.ru_utime).tv_usec / 1000000.0;
 127   tarray[0] = utime - (float) old_utime;
 128   stime = (float) (rbuff.ru_stime).tv_sec +
 129     (float) (rbuff.ru_stime).tv_usec / 1000000.0;
 130   tarray[1] = stime - old_stime;
 131 #else /* HAVE_GETRUSAGE */
 132   /* For dtime, etime we store the clock tick parameter (clk_tck) the
 133      first time either of them is invoked rather than each time.  This
 134      approach probably speeds up each invocation by avoiding a system
 135      call each time, but means that the overhead of the first call is
 136      different to all others. */
 137   static long clk_tck = 0;
 138   time_t utime, stime;
 139   static time_t old_utime = 0, old_stime = 0;
 140   struct tms buffer;
 141
 142 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
 143    fixme: does using _POSIX_VERSION help? */
 144 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
 145   if (!clk_tck)
 146     clk_tck = sysconf (_SC_CLK_TCK);
 147 #  elif defined CLOCKS_PER_SECOND
 148   if (!clk_tck)
 149     clk_tck = CLOCKS_PER_SECOND;
 150 #  elif defined CLK_TCK
 151   if (!clk_tck)
 152     clk_tck = CLK_TCK;
 153 #  elif defined HZ
 154   if (!clk_tck)
 155     clk_tck = HZ;
 156 #  elif defined HAVE_GETRUSAGE
 157 #  else
 158 #error Dont know clock tick length
 159 #  endif
 160   if (times (&buffer) == (clock_t) - 1)
 161     return -1.0;
 162   utime = buffer.tms_utime;
 163   stime = buffer.tms_stime;
 164   tarray[0] = ((float) (utime - old_utime)) / (float) clk_tck;
 165   tarray[1] = ((float) (stime - old_stime)) / (float) clk_tck;
 166 #endif /* HAVE_GETRUSAGE */
 167   old_utime = utime;
 168   old_stime = stime;
 169   return (tarray[0] + tarray[1]);
 170 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 171   errno = ENOSYS;
 172   return 0.0;
 173 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 174 }