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/*-
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 * Copyright (c) 2005-2008, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#ifndef _SYNC_H
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#define _SYNC_H
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#include <types.h>
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#include <sys/cdefs.h>
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#include <sys/list.h>
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#include <event.h>
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struct sem {
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        struct sem        *next;                /* linkage on semaphore list in system */
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        struct list        task_link;        /* linkage on semaphore list in task */
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        task_t                owner;                /* owner task */
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        struct event        event;                /* event */
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        u_int                value;                /* current value */
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        int                refcnt;                /* reference count */
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};
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struct mutex {
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        struct list        task_link;        /* linkage on mutex list in task */
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        task_t                owner;                /* owner task */
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        struct event        event;                /* event */
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        struct list        link;                /* linkage on locked mutex list */
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        thread_t        holder;                /* thread that holds the mutex */
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        int                priority;        /* highest priority in waiting threads */
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        int                locks;                /* counter for recursive lock */
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};
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struct cond {
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        struct list        task_link;        /* linkage on cv list in task */
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        task_t                owner;                /* owner task */
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        struct event        event;                /* event */
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};
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/* maximum value for semaphore. */
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#define MAXSEMVAL                ((u_int)((~0u) >> 1))
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/* max mutex count to inherit priority */
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#define MAXINHERIT                10
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#define MUTEX_INITIALIZER        (mutex_t)0x4d496e69        /* 'MIni' */
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#define COND_INITIALIZER        (cond_t)0x43496e69        /* 'CIni' */
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__BEGIN_DECLS
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int         sem_init(sem_t *, u_int);
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int         sem_destroy(sem_t *);
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int         sem_wait(sem_t *, u_long);
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int         sem_trywait(sem_t *);
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int         sem_post(sem_t *);
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int         sem_getvalue(sem_t *, u_int *);
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void         sem_cleanup(task_t);
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int         mutex_init(mutex_t *);
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int         mutex_destroy(mutex_t *);
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int         mutex_lock(mutex_t *);
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int         mutex_trylock(mutex_t *);
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int         mutex_unlock(mutex_t *);
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void         mutex_cancel(thread_t);
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void         mutex_setpri(thread_t, int);
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void         mutex_cleanup(task_t);
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int         cond_init(cond_t *);
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int         cond_destroy(cond_t *);
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int         cond_wait(cond_t *, mutex_t *);
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int         cond_signal(cond_t *);
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int         cond_broadcast(cond_t *);
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void         cond_cleanup(task_t);
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__END_DECLS
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#endif /* !_SYNC_H */