1139825Simp/*- 281645Sjasone * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. All rights reserved. 381645Sjasone * 481645Sjasone * Redistribution and use in source and binary forms, with or without 581645Sjasone * modification, are permitted provided that the following conditions 681645Sjasone * are met: 781645Sjasone * 1. Redistributions of source code must retain the above copyright 881645Sjasone * notice(s), this list of conditions and the following disclaimer as 981645Sjasone * the first lines of this file unmodified other than the possible 1081645Sjasone * addition of one or more copyright notices. 1181645Sjasone * 2. Redistributions in binary form must reproduce the above copyright 1281645Sjasone * notice(s), this list of conditions and the following disclaimer in the 1381645Sjasone * documentation and/or other materials provided with the distribution. 1481645Sjasone * 1581645Sjasone * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 1681645Sjasone * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 1781645Sjasone * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 1881645Sjasone * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 1981645Sjasone * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 2081645Sjasone * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 2181645Sjasone * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 2281645Sjasone * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2381645Sjasone * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2481645Sjasone * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 2581645Sjasone * DAMAGE. 2681645Sjasone * 2781645Sjasone * $FreeBSD$ 2881645Sjasone */ 2981645Sjasone 3081645Sjasone#ifndef _SYS_SEMA_H_ 3181645Sjasone#define _SYS_SEMA_H_ 3281645Sjasone 3384753Sbde#include <sys/queue.h> 3484753Sbde#include <sys/_lock.h> 3581645Sjasone#include <sys/_mutex.h> 3681645Sjasone#include <sys/condvar.h> 3781645Sjasone 3881645Sjasonestruct sema { 3981645Sjasone struct mtx sema_mtx; /* General protection lock. */ 4081645Sjasone struct cv sema_cv; /* Waiters. */ 4181645Sjasone int sema_waiters; /* Number of waiters. */ 4281645Sjasone int sema_value; /* Semaphore value. */ 4381645Sjasone}; 4481645Sjasone 4581645Sjasone#ifdef _KERNEL 4681645Sjasonevoid sema_init(struct sema *sema, int value, const char *description); 4781645Sjasonevoid sema_destroy(struct sema *sema); 4881645Sjasonevoid _sema_post(struct sema *sema, const char *file, int line); 4981645Sjasonevoid _sema_wait(struct sema *sema, const char *file, int line); 5081645Sjasoneint _sema_timedwait(struct sema *sema, int timo, const char *file, int 5181645Sjasone line); 5281645Sjasoneint _sema_trywait(struct sema *sema, const char *file, int line); 5381645Sjasoneint sema_value(struct sema *sema); 5481645Sjasone 5583593Sjhb#define sema_post(sema) _sema_post((sema), LOCK_FILE, LOCK_LINE) 5683593Sjhb#define sema_wait(sema) _sema_wait((sema), LOCK_FILE, LOCK_LINE) 5781645Sjasone#define sema_timedwait(sema, timo) \ 5883593Sjhb _sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE) 5983593Sjhb#define sema_trywait(sema) _sema_trywait((sema), LOCK_FILE, LOCK_LINE) 6081645Sjasone 6181645Sjasone#endif /* _KERNEL */ 6281645Sjasone#endif /* _SYS_SEMA_H_ */ 63