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/*-
* Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/sys/sema.h 139825 2005-01-07 02:29:27Z imp $
*/
#ifndef _SYS_SEMA_H_
#define _SYS_SEMA_H_
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <sys/condvar.h>
struct sema {
struct mtx sema_mtx; /* General protection lock. */
struct cv sema_cv; /* Waiters. */
int sema_waiters; /* Number of waiters. */
int sema_value; /* Semaphore value. */
};
#ifdef _KERNEL
void sema_init(struct sema *sema, int value, const char *description);
void sema_destroy(struct sema *sema);
void _sema_post(struct sema *sema, const char *file, int line);
void _sema_wait(struct sema *sema, const char *file, int line);
int _sema_timedwait(struct sema *sema, int timo, const char *file, int
line);
int _sema_trywait(struct sema *sema, const char *file, int line);
int sema_value(struct sema *sema);
#define sema_post(sema) _sema_post((sema), LOCK_FILE, LOCK_LINE)
#define sema_wait(sema) _sema_wait((sema), LOCK_FILE, LOCK_LINE)
#define sema_timedwait(sema, timo) \
_sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE)
#define sema_trywait(sema) _sema_trywait((sema), LOCK_FILE, LOCK_LINE)
#endif /* _KERNEL */
#endif /* _SYS_SEMA_H_ */