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glibc  2.9
semaphore.h
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00001 /* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #ifndef _SEMAPHORE_H
00021 # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
00022 #endif
00023 
00024 #include <bits/wordsize.h>
00025 
00026 #if __WORDSIZE == 64
00027 # define __SIZEOF_SEM_T     32
00028 #else
00029 # define __SIZEOF_SEM_T     16
00030 #endif
00031 
00032 
00033 /* Value returned if `sem_open' failed.  */
00034 #define SEM_FAILED      ((sem_t *) 0)
00035 
00036 
00037 typedef union
00038 {
00039   char __size[__SIZEOF_SEM_T];
00040   long int __align;
00041 } sem_t;