LCOM1920-T02G10

/*        $NetBSD: callback.h,v 1.3 2007/07/09 21:11:32 ad Exp $        */

/*-

 * Copyright (c)2006 YAMAMOTO Takashi,

 * 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.

 *

 * 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 _SYS_CALLBACK_H_

#define        _SYS_CALLBACK_H_

#include <sys/queue.h>

#include <sys/mutex.h>

#include <sys/condvar.h>

struct callback_entry {

        TAILQ_ENTRY(callback_entry) ce_q;

        int (*ce_func)(struct callback_entry *, void *, void *);

        void *ce_obj;

};

struct callback_head {

        kmutex_t ch_lock;

        kcondvar_t ch_cv;

        TAILQ_HEAD(, callback_entry) ch_q;

        struct callback_entry *ch_next;

        int ch_nentries;

        int ch_running;

        int ch_flags;

};

/* return values of ce_func */

#define        CALLBACK_CHAIN_CONTINUE        0

#define        CALLBACK_CHAIN_ABORT        1

int callback_run_roundrobin(struct callback_head *, void *);

void callback_register(struct callback_head *, struct callback_entry *,

    void *, int (*)(struct callback_entry *, void *, void *));

void callback_unregister(struct callback_head *, struct callback_entry *);

void callback_head_init(struct callback_head *, int);

void callback_head_destroy(struct callback_head *);

#endif /* !_SYS_CALLBACK_H_ */