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