sysdeps/unix/sysv/linux/i386/bits/time.h

   1 /* System-dependent timing definitions.  Linux/x86 version.
   2    Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C 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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /*
  21  * Never include this file directly; use <time.h> instead.
  22  */
  23
  24 #ifndef __need_timeval
  25 # ifndef _BITS_TIME_H
  26 #  define _BITS_TIME_H  1
  27
  28 /* ISO/IEC 9899:1990 7.12.1: <time.h>
  29    The macro `CLOCKS_PER_SEC' is the number per second of the value
  30    returned by the `clock' function. */
  31 /* CAE XSH, Issue 4, Version 2: <time.h>
  32    The value of CLOCKS_PER_SEC is required to be 1 million on all
  33    XSI-conformant systems. */
  34 #  define CLOCKS_PER_SEC  1000000l
  35
  36 #  ifndef __STRICT_ANSI__
  37 /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
  38    presents the real value for clock ticks per second for the system.  */
  39 #   define CLK_TCK 100
  40 #  endif
  41
  42 #  ifdef __USE_POSIX199309
  43 /* Identifier for system-wide realtime clock.  */
  44 #   define CLOCK_REALTIME               0
  45 /* High-resolution timer from the CPU.  */
  46 #   define CLOCK_PROCESS_CPUTIME_ID     2
  47 /* Thread-specific CPU-time clock.  */
  48 #   define CLOCK_THREAD_CPUTIME_ID      3
  49
  50 /* Flag to indicate time is absolute.  */
  51 #   define TIMER_ABSTIME                1
  52 #  endif
  53
  54 # endif /* bits/time.h */
  55 #endif
  56
  57 #ifdef __need_timeval
  58 # undef __need_timeval
  59 # ifndef _STRUCT_TIMEVAL
  60 #  define _STRUCT_TIMEVAL       1
  61 #  include <bits/types.h>
  62
  63 /* A time value that is accurate to the nearest
  64    microsecond but also has a range of years.  */
  65 struct timeval
  66   {
  67     __time_t tv_sec;            /* Seconds.  */
  68     __suseconds_t tv_usec;      /* Microseconds.  */
  69   };
  70 # endif /* struct timeval */
  71 #endif  /* need timeval */