nptl/sysdeps/unix/sysv/linux/x86_64/bits/semaphore.h

   1 /* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SEMAPHORE_H
  21 # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
  22 #endif
  23
  24 #include <bits/wordsize.h>
  25
  26 #if __WORDSIZE == 64
  27 # define __SIZEOF_SEM_T 32
  28 #else
  29 # define __SIZEOF_SEM_T 16
  30 #endif
  31
  32
  33 /* Value returned if `sem_open' failed.  */
  34 #define SEM_FAILED      ((sem_t *) 0)
  35
  36 /* Maximum value the semaphore can have.  */
  37 #define SEM_VALUE_MAX   (2147483647)
  38
  39
  40 typedef union
  41 {
  42   char __size[__SIZEOF_SEM_T];
  43   long int __align;
  44 } sem_t;