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_UNISTD_H
  23 #  include <unistd.h>
  24 #endif
  25 #include <sys/types.h>
  26 #if HAVE_SYS_TIMES_H
  27 #  include <sys/times.h>
  28 #endif
  29 #if HAVE_SYS_PARAM_H
  30 #  include <sys/param.h>
  31 #endif
  32 #if HAVE_GETRUSAGE
  33 #  include <sys/time.h>
  34 #  include <sys/resource.h>
  35 #endif
  36 #if defined (_WIN32)
  37 #  include <windows.h>
  38 #  undef min
  39 #  undef max
  40 #endif
  41 #include <errno.h>              /* for ENOSYS */
  42 #include "f2c.h"
  43
  44 /* For dtime, etime we store the clock tick parameter (clk_tck) the
  45    first time either of them is invoked rather than each time.  This
  46    approach probably speeds up each invocation by avoiding a system
  47    call each time, but means that the overhead of the first call is
  48    different to all others. */
  49 static long clk_tck = 0;
  50
  51 #ifdef KR_headers
  52 double G77_dtime_0 (tarray)
  53      real tarray[2];
  54 #else
  55 double G77_dtime_0 (real tarray[2])
  56 #endif
  57 {
  58 #if defined (_WIN32)
  59   static int win32_platform = -1;
  60
  61   if (win32_platform == -1)
  62     {
  63       OSVERSIONINFO osv;
  64       osv.dwOSVersionInfoSize = sizeof (osv);
  65       GetVersionEx (&osv);
  66       win32_platform = osv.dwPlatformId;
  67     }
  68
  69   /* We need to use this hack on non-NT platforms, where the first call
  70      returns 0.0 and subsequent ones return the correct value. */
  71   if (win32_platform != VER_PLATFORM_WIN32_NT)
  72     {
  73       static unsigned long long clock_freq;
  74       static unsigned long long old_count;
  75       unsigned long long count;
  76       double delta;
  77       LARGE_INTEGER counter_val;
  78
  79       if (clock_freq == 0)
  80         {
  81           LARGE_INTEGER freq;
  82           if (! QueryPerformanceFrequency (&freq))
  83             {
  84               errno = ENOSYS;
  85               return 0.0;
  86             }
  87           else
  88             {
  89               clock_freq = ((unsigned long long) freq.HighPart << 32)
  90                            + ((unsigned) freq.LowPart);
  91             }
  92         }
  93
  94       if (! QueryPerformanceCounter (&counter_val))
  95         return -1.0;
  96
  97       count = ((unsigned long long) counter_val.HighPart << 32)
  98               + (unsigned) counter_val.LowPart;
  99       delta = ((double) (count - old_count)) / clock_freq;
 100       tarray[0] = (float) delta;
 101       tarray[1] = 0.0;
 102       old_count = count;
 103     }
 104   else
 105     {
 106       static unsigned long long old_utime, old_stime;
 107       unsigned long long utime, stime;
 108       FILETIME creation_time, exit_time, kernel_time, user_time;
 109
 110       GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
 111                        &kernel_time, &user_time);
 112       utime = ((unsigned long long) user_time.dwHighDateTime << 32)
 113               + (unsigned) user_time.dwLowDateTime;
 114       stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
 115               + (unsigned) kernel_time.dwLowDateTime;
 116
 117       tarray[0] = (utime - old_utime) / 1.0e7;
 118       tarray[1] = (stime - old_stime) / 1.0e7;
 119       old_utime = utime;
 120       old_stime = stime;
 121     }
 122   return tarray[0] + tarray[1];
 123
 124 #elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
 125   /* The getrusage version is only the default for convenience. */
 126 #ifdef HAVE_GETRUSAGE
 127   float utime, stime;
 128   static float old_utime = 0.0, old_stime = 0.0;
 129   struct rusage rbuff;
 130
 131    if (getrusage (RUSAGE_SELF, &rbuff) != 0)
 132      abort ();
 133    utime = (float) (rbuff.ru_utime).tv_sec +
 134            (float) (rbuff.ru_utime).tv_usec/1000000.0;
 135    tarray[0] = utime - (float) old_utime;
 136    stime = (float) (rbuff.ru_stime).tv_sec +
 137            (float) (rbuff.ru_stime).tv_usec/1000000.0;
 138   tarray[1] = stime - old_stime;
 139 #else  /* HAVE_GETRUSAGE */
 140   time_t utime, stime;
 141   static time_t old_utime = 0, old_stime = 0;
 142   struct tms buffer;
 143
 144 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
 145    fixme: does using _POSIX_VERSION help? */
 146 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
 147   if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
 148 #  elif defined CLOCKS_PER_SECOND
 149   if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
 150 #  elif defined CLK_TCK
 151   if (! clk_tck) clk_tck = CLK_TCK;
 152 #  elif defined HZ
 153   if (! clk_tck) clk_tck = HZ;
 154 #  elif defined HAVE_GETRUSAGE
 155 #  else
 156   #error Dont know clock tick length
 157 #  endif
 158   if (times(&buffer) == (clock_t)-1) return -1.0;
 159   utime = buffer.tms_utime; stime = buffer.tms_stime;
 160   tarray[0] = ((float)(utime - old_utime)) / (float)clk_tck;
 161   tarray[1] = ((float)(stime - old_stime)) / (float)clk_tck;
 162 #endif /* HAVE_GETRUSAGE */
 163   old_utime = utime; old_stime = stime;
 164   return (tarray[0]+tarray[1]);
 165 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 166   errno = ENOSYS;
 167   return 0.0;
 168 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 169 }