1 /* Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
2 
3    The GNU C Library is free software; you can redistribute it and/or
4    modify it under the terms of the GNU Lesser General Public
5    License as published by the Free Software Foundation; either
6    version 2.1 of the License, or (at your option) any later version.
7 
8    The GNU C Library is distributed in the hope that it will be useful,
9    but WITHOUT ANY WARRANTY; without even the implied warranty of
10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11    Lesser General Public License for more details.
12 
13    You should have received a copy of the GNU Lesser General Public
14    License along with the GNU C Library.  If not, see
15    <http://www.gnu.org/licenses/>.  */
16 
17 #ifndef _SEMAPHORE_H
18 # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
19 #endif
20 
21 
22 #define __SIZEOF_SEM_T	(4 * __SIZEOF_POINTER__)
23 
24 
25 /* Value returned if `sem_open' failed.  */
26 #define SEM_FAILED      ((sem_t *) 0)
27 
28 
29 typedef union
30 {
31   char __size[__SIZEOF_SEM_T];
32   long int __align;
33 } sem_t;
34