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/*-

 * Copyright (c) 2005-2008, Kohsuke Ohtani

 * 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, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.

 */

#ifndef _SYNC_H

#define _SYNC_H

#include <types.h>

#include <sys/cdefs.h>

#include <sys/list.h>

#include <event.h>

struct sem {

        struct sem        *next;                /* linkage on semaphore list in system */

        struct list        task_link;        /* linkage on semaphore list in task */

        task_t                owner;                /* owner task */

        struct event        event;                /* event */

        u_int                value;                /* current value */

        int                refcnt;                /* reference count */

};

struct mutex {

        struct list        task_link;        /* linkage on mutex list in task */

        task_t                owner;                /* owner task */

        struct event        event;                /* event */

        struct list        link;                /* linkage on locked mutex list */

        thread_t        holder;                /* thread that holds the mutex */

        int                priority;        /* highest priority in waiting threads */

        int                locks;                /* counter for recursive lock */

};

struct cond {

        struct list        task_link;        /* linkage on cv list in task */

        task_t                owner;                /* owner task */

        struct event        event;                /* event */

};

/* maximum value for semaphore. */

#define MAXSEMVAL                ((u_int)((~0u) >> 1))

/* max mutex count to inherit priority */

#define MAXINHERIT                10

#define MUTEX_INITIALIZER        (mutex_t)0x4d496e69        /* 'MIni' */

#define COND_INITIALIZER        (cond_t)0x43496e69        /* 'CIni' */

__BEGIN_DECLS

int         sem_init(sem_t *, u_int);

int         sem_destroy(sem_t *);

int         sem_wait(sem_t *, u_long);

int         sem_trywait(sem_t *);

int         sem_post(sem_t *);

int         sem_getvalue(sem_t *, u_int *);

void         sem_cleanup(task_t);

int         mutex_init(mutex_t *);

int         mutex_destroy(mutex_t *);

int         mutex_lock(mutex_t *);

int         mutex_trylock(mutex_t *);

int         mutex_unlock(mutex_t *);

void         mutex_cancel(thread_t);

void         mutex_setpri(thread_t, int);

void         mutex_cleanup(task_t);

int         cond_init(cond_t *);

int         cond_destroy(cond_t *);

int         cond_wait(cond_t *, mutex_t *);

int         cond_signal(cond_t *);

int         cond_broadcast(cond_t *);

void         cond_cleanup(task_t);

__END_DECLS

#endif /* !_SYNC_H */