FreeBSD/Linux Kernel Cross Reference
sys/sys/callback.h
1 /* $NetBSD: callback.h,v 1.2 2006/08/28 13:40:44 yamt Exp $ */
2
3 /*-
4 * Copyright (c)2006 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _SYS_CALLBACK_H_
30 #define _SYS_CALLBACK_H_
31
32 #include <sys/queue.h>
33 #include <sys/lock.h>
34
35 struct callback_entry {
36 TAILQ_ENTRY(callback_entry) ce_q;
37 int (*ce_func)(struct callback_entry *, void *, void *);
38 void *ce_obj;
39 };
40
41 struct callback_head {
42 struct simplelock ch_lock;
43 TAILQ_HEAD(, callback_entry) ch_q;
44 struct callback_entry *ch_next;
45 int ch_nentries;
46 int ch_running;
47 int ch_flags;
48 };
49
50 /* return values of ce_func */
51 #define CALLBACK_CHAIN_CONTINUE 0
52 #define CALLBACK_CHAIN_ABORT 1
53
54 int callback_run_roundrobin(struct callback_head *, void *);
55 void callback_register(struct callback_head *, struct callback_entry *,
56 void *, int (*)(struct callback_entry *, void *, void *));
57 void callback_unregister(struct callback_head *, struct callback_entry *);
58 void callback_head_init(struct callback_head *);
59
60 #endif /* !_SYS_CALLBACK_H_ */
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