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callback.h
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callback.h
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/* $NetBSD: callback.h,v 1.1 2006/05/25 14:27:28 yamt 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_
struct callback_entry {
TAILQ_ENTRY(callback_entry) ce_q;
int (*ce_func)(struct callback_entry *, void *, void *);
void *ce_obj;
};
struct callback_head {
struct simplelock ch_lock;
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 *);
#endif /* !_SYS_CALLBACK_H_ */