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/eventhandler.h

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    1 /*-
    2  * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: stable/4/sys/sys/eventhandler.h 56093 2000-01-16 06:11:33Z bde $
   27  */
   28 
   29 #include <sys/queue.h>
   30 
   31 #ifndef SYS_EVENTHANDLER_H
   32 #define SYS_EVENTHANDLER_H
   33 
   34 struct eventhandler_entry 
   35 {
   36     TAILQ_ENTRY(eventhandler_entry)     ee_link;
   37     int                                 ee_priority;
   38     void                                *ee_arg;
   39 };
   40 
   41 struct eventhandler_list 
   42 {
   43     TAILQ_ENTRY(eventhandler_list)      el_link;
   44     char                                *el_name;
   45     int                                 el_flags;
   46 #define EHE_INITTED     (1<<0)
   47     TAILQ_HEAD(,eventhandler_entry)     el_entries;
   48 };
   49 
   50 typedef struct eventhandler_entry       *eventhandler_tag;
   51 
   52 /* 
   53  * Fast handler lists require the eventhandler list be present
   54  * at link time.  They don't allow addition of entries to
   55  * unknown eventhandler lists, ie. each list must have an 
   56  * "owner".
   57  *
   58  * Fast handler lists must be defined once by the owner 
   59  * of the eventhandler list, and the declaration must be in 
   60  * scope at any point the list is manipulated.
   61  */
   62 #define EVENTHANDLER_FAST_DECLARE(name, type)                   \
   63 extern struct eventhandler_list Xeventhandler_list_ ## name ;   \
   64 struct eventhandler_entry_ ## name                              \
   65 {                                                               \
   66     struct eventhandler_entry   ee;                             \
   67     type                eh_func;                                \
   68 };                                                              \
   69 struct __hack
   70 
   71 #define EVENTHANDLER_FAST_DEFINE(name, type)                            \
   72 struct eventhandler_list Xeventhandler_list_ ## name = { #name };       \
   73 struct __hack
   74 
   75 #define EVENTHANDLER_FAST_INVOKE(name, args...)                         \
   76 do {                                                                    \
   77     struct eventhandler_list *_el = &Xeventhandler_list_ ## name ;      \
   78     struct eventhandler_entry *_ep = TAILQ_FIRST(&(_el->el_entries));   \
   79                                                                         \
   80     while (_ep != NULL) {                                               \
   81         ((struct eventhandler_entry_ ## name *)_ep)->eh_func(_ep->ee_arg , ## args); \
   82         _ep = TAILQ_NEXT(_ep, ee_link);                                 \
   83     }                                                                   \
   84 } while (0)
   85 
   86 #define EVENTHANDLER_FAST_REGISTER(name, func, arg, priority) \
   87     eventhandler_register(Xeventhandler_list_ ## name, #name, func, arg, priority)
   88 
   89 #define EVENTHANDLER_FAST_DEREGISTER(name, tag) \
   90     eventhandler_deregister(Xeventhandler_list ## name, tag)
   91 
   92 
   93 /*
   94  * Slow handlerss are entirely dynamic; lists are created
   95  * when entries are added to them, and thus have no concept of "owner",
   96  *
   97  * Slow handlerss need to be declared, but do not need to be defined. The
   98  * declaration must be in scope wherever the handler is to be invoked.
   99  */
  100 #define EVENTHANDLER_DECLARE(name, type)        \
  101 struct eventhandler_entry_ ## name              \
  102 {                                               \
  103     struct eventhandler_entry   ee;             \
  104     type                eh_func;                \
  105 };                                              \
  106 struct __hack
  107 
  108 #define EVENTHANDLER_INVOKE(name, args...)                              \
  109 do {                                                                    \
  110     struct eventhandler_list *_el;                                      \
  111     struct eventhandler_entry *_ep;                                     \
  112                                                                         \
  113     if ((_el = eventhandler_find_list(#name)) != NULL) {                \
  114         for (_ep = TAILQ_FIRST(&(_el->el_entries));                     \
  115              _ep != NULL;                                               \
  116              _ep = TAILQ_NEXT(_ep, ee_link)) {                          \
  117             ((struct eventhandler_entry_ ## name *)_ep)->eh_func(_ep->ee_arg , ## args); \
  118         }                                                               \
  119     }                                                                   \
  120 } while (0)
  121 
  122 #define EVENTHANDLER_REGISTER(name, func, arg, priority) \
  123     eventhandler_register(NULL, #name, func, arg, priority)
  124 
  125 #define EVENTHANDLER_DEREGISTER(name, tag)              \
  126 do {                                                    \
  127     struct eventhandler_list *_el;                      \
  128                                                         \
  129     if ((_el = eventhandler_find_list(#name)) != NULL)  \
  130         eventhandler_deregister(_el, tag);              \
  131 } while(0)
  132         
  133 
  134 extern eventhandler_tag eventhandler_register(struct eventhandler_list *list, 
  135                                               char *name,
  136                                               void *func, 
  137                                               void *arg, 
  138                                               int priority);
  139 extern void             eventhandler_deregister(struct eventhandler_list *list,
  140                                                 eventhandler_tag tag);
  141 extern struct eventhandler_list *eventhandler_find_list(char *name);
  142 
  143 /*
  144  * Standard system event queues.
  145  */
  146 
  147 /* Shutdown events */
  148 typedef void (*shutdown_fn) __P((void *, int));
  149 
  150 #define SHUTDOWN_PRI_FIRST      0
  151 #define SHUTDOWN_PRI_DEFAULT    10000
  152 #define SHUTDOWN_PRI_LAST       20000
  153 
  154 EVENTHANDLER_DECLARE(shutdown_pre_sync, shutdown_fn);   /* before fs sync */
  155 EVENTHANDLER_DECLARE(shutdown_post_sync, shutdown_fn);  /* after fs sync */
  156 EVENTHANDLER_DECLARE(shutdown_final, shutdown_fn);
  157 
  158 #endif /* SYS_EVENTHANDLER_H */

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