1 | /* Generic POSIX semaphore type layout |
2 | Copyright (C) 1995-2024 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 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, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #ifndef _SEMAPHORE_H |
20 | # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead." |
21 | #endif |
22 | |
23 | #include <bits/wordsize.h> |
24 | |
25 | #if __WORDSIZE == 64 |
26 | # define __SIZEOF_SEM_T 32 |
27 | #else |
28 | # define __SIZEOF_SEM_T 16 |
29 | #endif |
30 | |
31 | /* Value returned if `sem_open' failed. */ |
32 | #define SEM_FAILED ((sem_t *) 0) |
33 | |
34 | |
35 | typedef union |
36 | { |
37 | char __size[__SIZEOF_SEM_T]; |
38 | long int __align; |
39 | } sem_t; |
40 | |