_eventhandler.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
    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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SYS__EVENTHANDLER_H_
   32 #define _SYS__EVENTHANDLER_H_
   33 
   34 #include <sys/queue.h>
   35 
   36 struct eventhandler_entry {
   37         TAILQ_ENTRY(eventhandler_entry) ee_link;
   38         int                             ee_priority;
   39 #define EHE_DEAD_PRIORITY       (-1)
   40         void                            *ee_arg;
   41 };
   42 
   43 typedef struct eventhandler_entry       *eventhandler_tag;
   44 
   45 /*
   46  * You can optionally use the EVENTHANDLER_LIST and EVENTHANDLER_DIRECT macros
   47  * to pre-define a symbol for the eventhandler list. This symbol can be used by
   48  * EVENTHANDLER_DIRECT_INVOKE, which has the advantage of not needing to do a
   49  * locked search of the global list of eventhandler lists. At least
   50  * EVENTHANDLER_LIST_DEFINE must be used for EVENTHANDLER_DIRECT_INVOKE to
   51  * work. EVENTHANDLER_LIST_DECLARE is only needed if the call to
   52  * EVENTHANDLER_DIRECT_INVOKE is in a different compilation unit from
   53  * EVENTHANDLER_LIST_DEFINE. If the events are even relatively high frequency
   54  * it is suggested that you directly define a list for them.
   55  */
   56 struct eventhandler_list;
   57 #define EVENTHANDLER_LIST_DECLARE(name)                                 \
   58 extern struct eventhandler_list *_eventhandler_list_ ## name            \
   59 
   60 /*
   61  * Event handlers need to be declared, but do not need to be defined. The
   62  * declaration must be in scope wherever the handler is to be invoked.
   63  */
   64 #define EVENTHANDLER_DECLARE(name, type)                                \
   65 struct eventhandler_entry_ ## name                                      \
   66 {                                                                       \
   67         struct eventhandler_entry       ee;                             \
   68         type                            eh_func;                        \
   69 };                                                                      \
   70 struct __hack
   71 
   72 #endif

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

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sys/sys/_eventhandler.h