1 | /* $NetBSD: callback.h,v 1.3 2007/07/09 21:11:32 ad 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/mutex.h> |
34 | #include <sys/condvar.h> |
35 | |
36 | struct callback_entry { |
37 | TAILQ_ENTRY(callback_entry) ce_q; |
38 | int (*ce_func)(struct callback_entry *, void *, void *); |
39 | void *ce_obj; |
40 | }; |
41 | |
42 | struct callback_head { |
43 | kmutex_t ch_lock; |
44 | kcondvar_t ch_cv; |
45 | TAILQ_HEAD(, callback_entry) ch_q; |
46 | struct callback_entry *ch_next; |
47 | int ch_nentries; |
48 | int ch_running; |
49 | int ch_flags; |
50 | }; |
51 | |
52 | /* return values of ce_func */ |
53 | #define CALLBACK_CHAIN_CONTINUE 0 |
54 | #define CALLBACK_CHAIN_ABORT 1 |
55 | |
56 | int callback_run_roundrobin(struct callback_head *, void *); |
57 | void callback_register(struct callback_head *, struct callback_entry *, |
58 | void *, int (*)(struct callback_entry *, void *, void *)); |
59 | void callback_unregister(struct callback_head *, struct callback_entry *); |
60 | void callback_head_init(struct callback_head *, int); |
61 | void callback_head_destroy(struct callback_head *); |
62 | |
63 | #endif /* !_SYS_CALLBACK_H_ */ |
64 | |