The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/callback.h

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    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_ */

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