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