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 /* For dtime, etime we store the clock tick parameter (clk_tck) the
  48    first time either of them is invoked rather than each time.  This
  49    approach probably speeds up each invocation by avoiding a system
  50    call each time, but means that the overhead of the first call is
  51    different to all others. */
  52 static long clk_tck = 0;
  53
  54 #ifdef KR_headers
  55 double G77_dtime_0 (tarray)
  56      real tarray[2];
  57 #else
  58 double G77_dtime_0 (real tarray[2])
  59 #endif
  60 {
  61 #if defined (_WIN32)
  62   static int win32_platform = -1;
  63
  64   if (win32_platform == -1)
  65     {
  66       OSVERSIONINFO osv;
  67       osv.dwOSVersionInfoSize = sizeof (osv);
  68       GetVersionEx (&osv);
  69       win32_platform = osv.dwPlatformId;
  70     }
  71
  72   /* We need to use this hack on non-NT platforms, where the first call
  73      returns 0.0 and subsequent ones return the correct value. */
  74   if (win32_platform != VER_PLATFORM_WIN32_NT)
  75     {
  76       static unsigned long long clock_freq;
  77       static unsigned long long old_count;
  78       unsigned long long count;
  79       double delta;
  80       LARGE_INTEGER counter_val;
  81
  82       if (clock_freq == 0)
  83         {
  84           LARGE_INTEGER freq;
  85           if (! QueryPerformanceFrequency (&freq))
  86             {
  87               errno = ENOSYS;
  88               return 0.0;
  89             }
  90           else
  91             {
  92               clock_freq = ((unsigned long long) freq.HighPart << 32)
  93                            + ((unsigned) freq.LowPart);
  94             }
  95         }
  96
  97       if (! QueryPerformanceCounter (&counter_val))
  98         return -1.0;
  99
 100       count = ((unsigned long long) counter_val.HighPart << 32)
 101               + (unsigned) counter_val.LowPart;
 102       delta = ((double) (count - old_count)) / clock_freq;
 103       tarray[0] = (float) delta;
 104       tarray[1] = 0.0;
 105       old_count = count;
 106     }
 107   else
 108     {
 109       static unsigned long long old_utime, old_stime;
 110       unsigned long long utime, stime;
 111       FILETIME creation_time, exit_time, kernel_time, user_time;
 112
 113       GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
 114                        &kernel_time, &user_time);
 115       utime = ((unsigned long long) user_time.dwHighDateTime << 32)
 116               + (unsigned) user_time.dwLowDateTime;
 117       stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
 118               + (unsigned) kernel_time.dwLowDateTime;
 119
 120       tarray[0] = (utime - old_utime) / 1.0e7;
 121       tarray[1] = (stime - old_stime) / 1.0e7;
 122       old_utime = utime;
 123       old_stime = stime;
 124     }
 125   return tarray[0] + tarray[1];
 126
 127 #elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
 128   /* The getrusage version is only the default for convenience. */
 129 #ifdef HAVE_GETRUSAGE
 130   float utime, stime;
 131   static float old_utime = 0.0, old_stime = 0.0;
 132   struct rusage rbuff;
 133
 134    if (getrusage (RUSAGE_SELF, &rbuff) != 0)
 135      abort ();
 136    utime = (float) (rbuff.ru_utime).tv_sec +
 137            (float) (rbuff.ru_utime).tv_usec/1000000.0;
 138    tarray[0] = utime - (float) old_utime;
 139    stime = (float) (rbuff.ru_stime).tv_sec +
 140            (float) (rbuff.ru_stime).tv_usec/1000000.0;
 141   tarray[1] = stime - old_stime;
 142 #else  /* HAVE_GETRUSAGE */
 143   time_t utime, stime;
 144   static time_t old_utime = 0, old_stime = 0;
 145   struct tms buffer;
 146
 147 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
 148    fixme: does using _POSIX_VERSION help? */
 149 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
 150   if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
 151 #  elif defined CLOCKS_PER_SECOND
 152   if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
 153 #  elif defined CLK_TCK
 154   if (! clk_tck) clk_tck = CLK_TCK;
 155 #  elif defined HZ
 156   if (! clk_tck) clk_tck = HZ;
 157 #  elif defined HAVE_GETRUSAGE
 158 #  else
 159   #error Dont know clock tick length
 160 #  endif
 161   if (times(&buffer) == (clock_t)-1) return -1.0;
 162   utime = buffer.tms_utime; stime = buffer.tms_stime;
 163   tarray[0] = ((float)(utime - old_utime)) / (float)clk_tck;
 164   tarray[1] = ((float)(stime - old_stime)) / (float)clk_tck;
 165 #endif /* HAVE_GETRUSAGE */
 166   old_utime = utime; old_stime = stime;
 167   return (tarray[0]+tarray[1]);
 168 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 169   errno = ENOSYS;
 170   return 0.0;
 171 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 172 }