1 /* Copyright (C) 2010-2022 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library.  If not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #ifndef _SEMAPHORE_H
19 # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
20 #endif
21 
22 
23 #define __SIZEOF_SEM_T	16
24 
25 
26 /* Value returned if `sem_open' failed.  */
27 #define SEM_FAILED      ((sem_t *) 0)
28 
29 
30 typedef union
31 {
32   char __size[__SIZEOF_SEM_T];
33   long int __align __attribute__ ((__aligned__ (4)));
34 } sem_t;
35