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 #include <errno.h>              /* for ENOSYS */
  37 #include "f2c.h"
  38
  39 /* For dtime, etime we store the clock tick parameter (clk_tck) the
  40    first time either of them is invoked rather than each time.  This
  41    approach probably speeds up each invocation by avoiding a system
  42    call each time, but means that the overhead of the first call is
  43    different to all others. */
  44 static long clk_tck = 0;
  45
  46 #ifdef KR_headers
  47 double G77_etime_0 (tarray)
  48      real tarray[2];
  49 #else
  50 double G77_etime_0 (real tarray[2])
  51 #endif
  52 {
  53 #if defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
  54   /* The getrusage version is only the default for convenience. */
  55 #ifdef HAVE_GETRUSAGE
  56   struct rusage rbuff;
  57
  58    if (getrusage (RUSAGE_SELF, &rbuff) != 0)
  59      abort ();
  60    tarray[0] = ((float) (rbuff.ru_utime).tv_sec +
  61                (float) (rbuff.ru_utime).tv_usec/1000000.0);
  62    tarray[1] = ((float) (rbuff.ru_stime).tv_sec +
  63                (float) (rbuff.ru_stime).tv_usec/1000000.0);
  64 #else  /* HAVE_GETRUSAGE */
  65   struct tms buffer;
  66
  67 /* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
  68    fixme: does using _POSIX_VERSION help? */
  69 #  if defined _SC_CLK_TCK && defined _POSIX_VERSION
  70   if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
  71 #  elif defined CLOCKS_PER_SECOND
  72   if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
  73 #  elif defined CLK_TCK
  74   if (! clk_tck) clk_tck = CLK_TCK;
  75 #  elif defined HZ
  76   if (! clk_tck) clk_tck = HZ;
  77 #  elif defined HAVE_GETRUSAGE
  78 #  else
  79   #error Dont know clock tick length
  80 #  endif
  81   if (times(&buffer) < 0) return -1.0;
  82   tarray[0] = (float) buffer.tms_utime / (float)clk_tck;
  83   tarray[1] = (float) buffer.tms_stime / (float)clk_tck;
  84 #endif /* HAVE_GETRUSAGE */
  85   return (tarray[0]+tarray[1]);
  86 #else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
  87   errno = ENOSYS;
  88   return 0.0;
  89 #endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
  90 }