1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2010 David Xu <davidxu@freebsd.org> 5 * 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* semaphore.h: POSIX 1003.1b semaphores */ 33 34 #ifndef _SEMAPHORE_H_ 35 #define _SEMAPHORE_H_ 36 37 #include <sys/cdefs.h> 38 #include <sys/_types.h> 39 #include <sys/_umtx.h> 40 41 #include <machine/_limits.h> 42 43 struct _sem { 44 __uint32_t _magic; 45 struct _usem2 _kern; 46 __uint32_t _padding; /* Preserve structure size */ 47 }; 48 49 typedef struct _sem sem_t; 50 51 #define SEM_FAILED ((sem_t *)0) 52 #define SEM_VALUE_MAX __INT_MAX 53 54 struct timespec; 55 56 __BEGIN_DECLS 57 #if __BSD_VISIBLE 58 int sem_clockwait_np(sem_t * __restrict, __clockid_t, int, 59 const struct timespec *, struct timespec *); 60 #endif 61 int sem_close(sem_t *); 62 int sem_destroy(sem_t *); 63 int sem_getvalue(sem_t * __restrict, int * __restrict); 64 int sem_init(sem_t *, int, unsigned int); 65 sem_t *sem_open(const char *, int, ...); 66 int sem_post(sem_t *); 67 int sem_timedwait(sem_t * __restrict, const struct timespec * __restrict); 68 int sem_trywait(sem_t *); 69 int sem_unlink(const char *); 70 int sem_wait(sem_t *); 71 __END_DECLS 72 73 #endif /* !_SEMAPHORE_H_ */ 74