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_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_etime_0 (tarray)
  53      real tarray[2];
  54 #else
  55 double G77_etime_0 (real tarray[2])
  56 #endif
  57 {
  58 #if defined (_WIN32)
  59   static int win32_platform = -1;
  60   double usertime, systime;
  61
  62   if (win32_platform == -1)
  63     {
  64       OSVERSIONINFO osv;
  65       osv.dwOSVersionInfoSize = sizeof (osv);
  66       GetVersionEx (&osv);
  67       win32_platform = osv.dwPlatformId;
  68     }
  69
  70   /* non-NT platforms don't have a clue as to how long a process has
  71      been running, so simply return the uptime. Bad judgement call? */
  72   if (win32_platform != VER_PLATFORM_WIN32_NT)
  73     {
  74       static unsigned long long clock_freq;
  75       static unsigned long long old_count;
  76       unsigned long long count;
  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               if (! QueryPerformanceCounter (&counter_val))
  92                 return -1.0;
  93               old_count = ((unsigned long long) counter_val.HighPart << 32)
  94                           + (unsigned) counter_val.LowPart;
  95             }
  96         }
  97
  98       if (! QueryPerformanceCounter (&counter_val))
  99         return -1.0;
 100
 101       count = ((unsigned long long) counter_val.HighPart << 32)
 102               + (unsigned) counter_val.LowPart;
 103       tarray[0] = usertime = (double) (count - old_count) / clock_freq;
 104       tarray[1] = systime = 0.0;
 105     }
 106   else
 107     {
 108       FILETIME creation_time, exit_time, kernel_time, user_time;
 109       unsigned long long utime, stime;
 110
 111       GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time,
 112                        &kernel_time, &user_time);
 113       utime = ((unsigned long long) user_time.dwHighDateTime << 32)
 114               + (unsigned) user_time.dwLowDateTime;
 115       stime = ((unsigned long long) kernel_time.dwHighDateTime << 32)
 116               + (unsigned) kernel_time.dwLowDateTime;
 117
 118       tarray[0] = usertime = utime / 1.0e7;
 119       tarray[1] = systime = stime / 1.0e7;
 120   }
 121   return usertime + systime;
 122
 123 #elif defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
 124   /* The getrusage version is only the default for convenience. */
 125 #ifdef HAVE_GETRUSAGE
 126   struct rusage rbuff;
 127
 128    if (getrusage (RUSAGE_SELF, &rbuff) != 0)
 129      abort ();
 130    tarray[0] = ((float) (rbuff.ru_utime).tv_sec +
 131                (float) (rbuff.ru_utime).tv_usec/1000000.0);
 132    tarray[1] = ((float) (rbuff.ru_stime).tv_sec +
 133                (float) (rbuff.ru_stime).tv_usec/1000000.0);
 134 #else  /* HAVE_GETRUSAGE */
 135   struct tms buffer;
 136
 137 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
 138    fixme: does using _POSIX_VERSION help? */
 139 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
 140   if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
 141 #  elif defined CLOCKS_PER_SECOND
 142   if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
 143 #  elif defined CLK_TCK
 144   if (! clk_tck) clk_tck = CLK_TCK;
 145 #  elif defined HZ
 146   if (! clk_tck) clk_tck = HZ;
 147 #  elif defined HAVE_GETRUSAGE
 148 #  else
 149   #error Dont know clock tick length
 150 #  endif
 151   if (times(&buffer) == (clock_t)-1) return -1.0;
 152   tarray[0] = (float) buffer.tms_utime / (float)clk_tck;
 153   tarray[1] = (float) buffer.tms_stime / (float)clk_tck;
 154 #endif /* HAVE_GETRUSAGE */
 155   return (tarray[0]+tarray[1]);
 156 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 157   errno = ENOSYS;
 158   return 0.0;
 159 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
 160 }