1 /*- 2 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 #ifndef __SEMAPHORE_H_ 29 #define __SEMAPHORE_H_ 30 31 typedef intptr_t semid_t; 32 struct timespec; 33 34 #ifndef _KERNEL 35 36 #include <sys/cdefs.h> 37 38 /* 39 * Semaphore definitions. 40 */ 41 struct sem { 42 #define SEM_MAGIC ((u_int32_t) 0x09fa4012) 43 u_int32_t magic; 44 pthread_mutex_t lock; 45 pthread_cond_t gtzero; 46 u_int32_t count; 47 u_int32_t nwaiters; 48 #define SEM_USER (NULL) 49 semid_t semid; /* semaphore id if kernel (shared) semaphore */ 50 int syssem; /* 1 if kernel (shared) semaphore */ 51 LIST_ENTRY(sem) entry; 52 struct sem **backpointer; 53 }; 54 55 __BEGIN_DECLS 56 57 int ksem_close(semid_t id); 58 int ksem_post(semid_t id); 59 int ksem_wait(semid_t id); 60 int ksem_trywait(semid_t id); 61 int ksem_timedwait(semid_t id, const struct timespec *abstime); 62 int ksem_init(semid_t *idp, unsigned int value); 63 int ksem_open(semid_t *idp, const char *name, int oflag, mode_t mode, 64 unsigned int value); 65 int ksem_unlink(const char *name); 66 int ksem_getvalue(semid_t id, int *val); 67 int ksem_destroy(semid_t id); 68 69 __END_DECLS 70 71 #endif /* !_KERNEL */ 72 73 #endif /* __SEMAPHORE_H_ */ 74