1/*- 2 * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice(s), this list of conditions and the following disclaimer as 9 * the first lines of this file unmodified other than the possible 10 * addition of one or more copyright notices. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice(s), this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25 * DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30#ifndef _SYS_SEMA_H_ 31#define _SYS_SEMA_H_ 32 33#include <sys/queue.h> 34#include <sys/_lock.h> 35#include <sys/_mutex.h> 36#include <sys/condvar.h> 37 38struct sema { 39 struct mtx sema_mtx; /* General protection lock. */ 40 struct cv sema_cv; /* Waiters. */ 41 int sema_waiters; /* Number of waiters. */ 42 int sema_value; /* Semaphore value. */ 43}; 44 45#ifdef _KERNEL 46void sema_init(struct sema *sema, int value, const char *description); 47void sema_destroy(struct sema *sema); 48void _sema_post(struct sema *sema, const char *file, int line); 49void _sema_wait(struct sema *sema, const char *file, int line); 50int _sema_timedwait(struct sema *sema, int timo, const char *file, int 51 line); 52int _sema_trywait(struct sema *sema, const char *file, int line); 53int sema_value(struct sema *sema); 54 55#define sema_post(sema) _sema_post((sema), LOCK_FILE, LOCK_LINE) 56#define sema_wait(sema) _sema_wait((sema), LOCK_FILE, LOCK_LINE) 57#define sema_timedwait(sema, timo) \ 58 _sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE) 59#define sema_trywait(sema) _sema_trywait((sema), LOCK_FILE, LOCK_LINE) 60 61#endif /* _KERNEL */ 62#endif /* _SYS_SEMA_H_ */ 63