libf2c/libU77/etime_.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_etime_0 (real tarray[2])
  49 {
  50 #if defined (_WIN32)
  51   static int win32_platform = -1;
  52   double usertime, systime;
  53
  54   if (win32_platform == -1)
  55     {
  56       OSVERSIONINFO osv;
  57       osv.dwOSVersionInfoSize = sizeof (osv);
  58       GetVersionEx (&osv);
  59       win32_platform = osv.dwPlatformId;
  60     }
  61
  62   /* non-NT platforms don't have a clue as to how long a process has
  63      been running, so simply return the uptime. Bad judgement call? */
  64   if (win32_platform != VER_PLATFORM_WIN32_NT)
  65     {
  66       static unsigned long long clock_freq;
  67       static unsigned long long old_count;
  68       unsigned long long count;
  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               if (!QueryPerformanceCounter (&counter_val))
  84                 return -1.0;
  85               old_count = ((unsigned long long) counter_val.HighPart << 32)
  86                 + (unsigned) counter_val.LowPart;
  87             }
  88         }
  89
  90       if (!QueryPerformanceCounter (&counter_val))
  91         return -1.0;
  92
  93       count = ((unsigned long long) counter_val.HighPart << 32)
  94         + (unsigned) counter_val.LowPart;
  95       tarray[0] = usertime = (double) (count - old_count) / clock_freq;
  96       tarray[1] = systime = 0.0;
  97     }
  98   else
  99     {
 100       FILETIME creation_time, exit_time, kernel_time, user_time;
 101       unsigned long long utime, stime;
 102
 103       GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
 104                        &kernel_time, &user_time);
 105       utime = ((unsigned long long) user_time.dwHighDateTime << 32)
 106         + (unsigned) user_time.dwLowDateTime;
 107       stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
 108         + (unsigned) kernel_time.dwLowDateTime;
 109
 110       tarray[0] = usertime = utime / 1.0e7;
 111       tarray[1] = systime = stime / 1.0e7;
 112     }
 113   return usertime + systime;
 114
 115 #elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
 116   /* The getrusage version is only the default for convenience. */
 117 #ifdef HAVE_GETRUSAGE
 118   struct rusage rbuff;
 119
 120   if (getrusage (RUSAGE_SELF, &rbuff) != 0)
 121     abort ();
 122   tarray[0] = ((float) (rbuff.ru_utime).tv_sec +
 123                (float) (rbuff.ru_utime).tv_usec / 1000000.0);
 124   tarray[1] = ((float) (rbuff.ru_stime).tv_sec +
 125                (float) (rbuff.ru_stime).tv_usec / 1000000.0);
 126 #else /* HAVE_GETRUSAGE */
 127   /* For dtime, etime we store the clock tick parameter (clk_tck) the
 128      first time either of them is invoked rather than each time.  This
 129      approach probably speeds up each invocation by avoiding a system
 130      call each time, but means that the overhead of the first call is
 131      different to all others. */
 132   static long clk_tck = 0;
 133   struct tms buffer;
 134
 135 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
 136    fixme: does using _POSIX_VERSION help? */
 137 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
 138   if (!clk_tck)
 139     clk_tck = sysconf (_SC_CLK_TCK);
 140 #  elif defined CLOCKS_PER_SECOND
 141   if (!clk_tck)
 142     clk_tck = CLOCKS_PER_SECOND;
 143 #  elif defined CLK_TCK
 144   if (!clk_tck)
 145     clk_tck = CLK_TCK;
 146 #  elif defined HZ
 147   if (!clk_tck)
 148     clk_tck = HZ;
 149 #  elif defined HAVE_GETRUSAGE
 150 #  else
 151 #error Dont know clock tick length
 152 #  endif
 153   if (times (&buffer) == (clock_t) - 1)
 154     return -1.0;
 155   tarray[0] = (float) buffer.tms_utime / (float) clk_tck;
 156   tarray[1] = (float) buffer.tms_stime / (float) clk_tck;
 157 #endif /* HAVE_GETRUSAGE */
 158   return (tarray[0] + tarray[1]);
 159 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 160   errno = ENOSYS;
 161   return 0.0;
 162 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 163 }