libiberty/clock.c

   1 /* ANSI-compatible clock function.
   2    Copyright (C) 1994, 1995, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of the libiberty library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU CC; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25 #include "config.h"
  26
  27 #ifdef HAVE_GETRUSAGE
  28 #include <sys/time.h>
  29 #include <sys/resource.h>
  30 #endif
  31
  32 #ifdef HAVE_TIMES
  33 #ifdef HAVE_SYS_PARAM_H
  34 #include <sys/param.h>
  35 #endif
  36 #include <sys/times.h>
  37 #endif
  38
  39 #ifdef HAVE_UNISTD_H
  40 #include <unistd.h>
  41 #endif
  42
  43 #ifdef _SC_CLK_TCK
  44 #define GNU_HZ  sysconf(_SC_CLK_TCK)
  45 #else
  46 #ifdef HZ
  47 #define GNU_HZ  HZ
  48 #else
  49 #ifdef CLOCKS_PER_SEC
  50 #define GNU_HZ  CLOCKS_PER_SEC
  51 #endif
  52 #endif
  53 #endif
  54
  55 /* FIXME: should be able to declare as clock_t. */
  56
  57 long
  58 clock ()
  59 {
  60 #ifdef HAVE_GETRUSAGE
  61   struct rusage rusage;
  62
  63   getrusage (0, &rusage);
  64   return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
  65           + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
  66 #else
  67 #ifdef HAVE_TIMES
  68   struct tms tms;
  69
  70   times (&tms);
  71   return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
  72 #else
  73 #ifdef VMS
  74   struct
  75     {
  76       int proc_user_time;
  77       int proc_system_time;
  78       int child_user_time;
  79       int child_system_time;
  80     } vms_times;
  81
  82   times (&vms_times);
  83   return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
  84 #else
  85   /* A fallback, if nothing else available. */
  86   return 0;
  87 #endif /* VMS */
  88 #endif /* HAVE_TIMES */
  89 #endif /* HAVE_GETRUSAGE */
  90 }
  91