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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; |