gcc/f/runtime/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/times.h>
  26 #if HAVE_GETRUSAGE
  27 #  include <sys/time.h>
  28 #  include <sys/resource.h>
  29 #endif
  30 #include "f2c.h"
  31
  32 /* For dtime, etime we store the clock tick parameter (clk_tck) the
  33    first time either of them is invoked rather than each time.  This
  34    approach probably speeds up each invocation by avoiding a system
  35    call each time, but means that the overhead of the first call is
  36    different to all others. */
  37 static long clk_tck = 0;
  38
  39 #ifdef KR_headers
  40 doublereal G77_dtime_0 (tarray)
  41      real tarray[2];
  42 #else
  43 doublereal G77_dtime_0 (real tarray[2])
  44 #endif
  45 {
  46   time_t utime, stime;
  47   static time_t old_utime = 0, old_stime = 0;
  48   /* The getrusage version is only the default for convenience. */
  49 #ifdef HAVE_GETRUSAGE
  50   struct rusage rbuff;
  51
  52    if (getrusage (RUSAGE_SELF, &rbuff) != 0)
  53      abort ();
  54    utime = ((float) (rbuff.ru_utime).tv_sec +
  55            (float) (rbuff.ru_utime).tv_usec/1000000.0);
  56    tarray[0] = utime - (float) old_utime;
  57    stime = ((float) (rbuff.ru_stime).tv_sec +
  58            (float) (rbuff.ru_stime).tv_usec/1000000.0);
  59   tarray[1] = stime - old_stime;
  60 #else  /* HAVE_GETRUSAGE */
  61   struct tms buffer;
  62
  63 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
  64    fixme: does using _POSIX_VERSION help? */
  65 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
  66   if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
  67 #  elif defined CLOCKS_PER_SECOND
  68   if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
  69 #  elif defined CLK_TCK
  70   if (! clk_tck) clk_tck = CLK_TCK;
  71 #  elif defined HAVE_GETRUSAGE
  72 #  else
  73   #error Dont know clock tick length
  74 #  endif
  75   if (times(&buffer) < 0) return -1.0;
  76   utime = buffer.tms_utime; stime = buffer.tms_stime;
  77   tarray[0] = ((float)(utime - old_utime)) / (float)clk_tck;
  78   tarray[1] = ((float)(stime - old_stime)) / (float)clk_tck;
  79 #endif /* HAVE_GETRUSAGE */
  80   old_utime = utime; old_stime = stime;
  81   return (tarray[0]+tarray[1]);
  82 }