1 /* Semaphore type. Generic version. 2 Copyright (C) 2005-2021 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 _BITS_SEMAPHORE_H 20 #define _BITS_SEMAPHORE_H 1 21 22 #ifndef _SEMAPHORE_H 23 # error Never include <bits/semaphore.h> directly. 24 #endif 25 26 #include <bits/types/__pthread_spinlock_t.h> 27 #include <bits/pthread.h> 28 29 /* User visible part of a semaphore. */ 30 31 #define __SIZEOF_SEM_T 20 32 33 typedef union 34 { 35 char __size[__SIZEOF_SEM_T]; 36 long int __align; 37 } sem_t; 38 39 #define SEM_FAILED ((void *) 0) 40 41 #endif /* bits/semaphore.h */ 42