/*
 * 	cn_queue.h
 * 
 * 2004 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 * All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __CN_QUEUE_H
#define __CN_QUEUE_H

#include <asm/types.h>

struct cb_id
{
	__u32			idx;
	__u32			val;
};

#ifdef __KERNEL__

#include <asm/atomic.h>

#include <linux/list.h>
#include <linux/workqueue.h>

#define CN_CBQ_NAMELEN		32

struct cn_queue_dev
{
	atomic_t		refcnt;
	unsigned char		name[CN_CBQ_NAMELEN];

	struct workqueue_struct	*cn_queue;
	
	struct list_head 	queue_list;
	spinlock_t 		queue_lock;

	int			netlink_groups;
	struct sock		*nls;
};

struct cn_callback
{
	unsigned char		name[CN_CBQ_NAMELEN];
	
	struct cb_id		id;
	void			(* callback)(void *);
	void			*priv;
	
	atomic_t		refcnt;
};

struct cn_callback_entry
{
	struct list_head	callback_entry;
	struct cn_callback	*cb;
	struct work_struct	work;
	struct cn_queue_dev	*pdev;
	
	void			(* destruct_data)(void *);
	void			*ddata;

	int			seq, group;
	struct sock		*nls;
};

int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb);
void cn_queue_del_callback(struct cn_queue_dev *dev, struct cn_callback *cb);

struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
void cn_queue_free_dev(struct cn_queue_dev *dev);

int cn_cb_equal(struct cb_id *, struct cb_id *);

#endif /* __KERNEL__ */
#endif /* __CN_QUEUE_H */