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: releng/8.1/sys/sys/eventhandler.h 208487 2010-05-24 10:09:36Z pjd $
   27  */
   28 
   29 #ifndef SYS_EVENTHANDLER_H
   30 #define SYS_EVENTHANDLER_H
   31 
   32 #include <sys/lock.h>
   33 #include <sys/ktr.h>
   34 #include <sys/mutex.h>
   35 #include <sys/queue.h>
   36 
   37 struct eventhandler_entry {
   38         TAILQ_ENTRY(eventhandler_entry) ee_link;
   39         int                             ee_priority;
   40 #define EHE_DEAD_PRIORITY       (-1)
   41         void                            *ee_arg;
   42 };
   43 
   44 #ifdef VIMAGE
   45 struct eventhandler_entry_vimage {
   46         void    (* func)(void);         /* Original function registered. */
   47         void    *ee_arg;                /* Original argument registered. */
   48         void    *sparep[2];
   49 };
   50 #endif
   51 
   52 struct eventhandler_list {
   53         char                            *el_name;
   54         int                             el_flags;
   55 #define EHL_INITTED     (1<<0)
   56         u_int                           el_runcount;
   57         struct mtx                      el_lock;
   58         TAILQ_ENTRY(eventhandler_list)  el_link;
   59         TAILQ_HEAD(,eventhandler_entry) el_entries;
   60 };
   61 
   62 typedef struct eventhandler_entry       *eventhandler_tag;
   63 
   64 #define EHL_LOCK(p)             mtx_lock(&(p)->el_lock)
   65 #define EHL_UNLOCK(p)           mtx_unlock(&(p)->el_lock)
   66 #define EHL_LOCK_ASSERT(p, x)   mtx_assert(&(p)->el_lock, x)
   67 
   68 /*
   69  * Macro to invoke the handlers for a given event.
   70  */
   71 #define _EVENTHANDLER_INVOKE(name, list, ...) do {                      \
   72         struct eventhandler_entry *_ep;                                 \
   73         struct eventhandler_entry_ ## name *_t;                         \
   74                                                                         \
   75         KASSERT((list)->el_flags & EHL_INITTED,                         \
   76            ("eventhandler_invoke: running non-inited list"));           \
   77         EHL_LOCK_ASSERT((list), MA_OWNED);                              \
   78         (list)->el_runcount++;                                          \
   79         KASSERT((list)->el_runcount > 0,                                \
   80             ("eventhandler_invoke: runcount overflow"));                \
   81         CTR0(KTR_EVH, "eventhandler_invoke(\"" __STRING(name) "\")");   \
   82         TAILQ_FOREACH(_ep, &((list)->el_entries), ee_link) {            \
   83                 if (_ep->ee_priority != EHE_DEAD_PRIORITY) {            \
   84                         EHL_UNLOCK((list));                             \
   85                         _t = (struct eventhandler_entry_ ## name *)_ep; \
   86                         CTR1(KTR_EVH, "eventhandler_invoke: executing %p", \
   87                             (void *)_t->eh_func);                       \
   88                         _t->eh_func(_ep->ee_arg , ## __VA_ARGS__);      \
   89                         EHL_LOCK((list));                               \
   90                 }                                                       \
   91         }                                                               \
   92         KASSERT((list)->el_runcount > 0,                                \
   93             ("eventhandler_invoke: runcount underflow"));               \
   94         (list)->el_runcount--;                                          \
   95         if ((list)->el_runcount == 0)                                   \
   96                 eventhandler_prune_list(list);                          \
   97         EHL_UNLOCK((list));                                             \
   98 } while (0)
   99 
  100 /*
  101  * Slow handlers are entirely dynamic; lists are created
  102  * when entries are added to them, and thus have no concept of "owner",
  103  *
  104  * Slow handlers need to be declared, but do not need to be defined. The
  105  * declaration must be in scope wherever the handler is to be invoked.
  106  */
  107 #define EVENTHANDLER_DECLARE(name, type)                                \
  108 struct eventhandler_entry_ ## name                                      \
  109 {                                                                       \
  110         struct eventhandler_entry       ee;                             \
  111         type                            eh_func;                        \
  112 };                                                                      \
  113 struct __hack
  114 
  115 #define EVENTHANDLER_DEFINE(name, func, arg, priority)                  \
  116         static eventhandler_tag name ## _tag;                           \
  117         static void name ## _evh_init(void *ctx)                        \
  118         {                                                               \
  119                 name ## _tag = EVENTHANDLER_REGISTER(name, func, ctx,   \
  120                     priority);                                          \
  121         }                                                               \
  122         SYSINIT(name ## _evh_init, SI_SUB_CONFIGURE, SI_ORDER_ANY,      \
  123             name ## _evh_init, arg);                                    \
  124         struct __hack
  125 
  126 #define EVENTHANDLER_INVOKE(name, ...)                                  \
  127 do {                                                                    \
  128         struct eventhandler_list *_el;                                  \
  129                                                                         \
  130         if ((_el = eventhandler_find_list(#name)) != NULL)              \
  131                 _EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__);       \
  132 } while (0)
  133 
  134 #define EVENTHANDLER_REGISTER(name, func, arg, priority)                \
  135         eventhandler_register(NULL, #name, func, arg, priority)
  136 
  137 #define EVENTHANDLER_DEREGISTER(name, tag)                              \
  138 do {                                                                    \
  139         struct eventhandler_list *_el;                                  \
  140                                                                         \
  141         if ((_el = eventhandler_find_list(#name)) != NULL)              \
  142                 eventhandler_deregister(_el, tag);                      \
  143 } while(0)
  144         
  145 
  146 eventhandler_tag eventhandler_register(struct eventhandler_list *list, 
  147             const char *name, void *func, void *arg, int priority);
  148 void    eventhandler_deregister(struct eventhandler_list *list,
  149             eventhandler_tag tag);
  150 struct eventhandler_list *eventhandler_find_list(const char *name);
  151 void    eventhandler_prune_list(struct eventhandler_list *list);
  152 
  153 #ifdef VIMAGE
  154 typedef void (*vimage_iterator_func_t)(void *, ...);
  155 
  156 eventhandler_tag vimage_eventhandler_register(struct eventhandler_list *list,
  157             const char *name, void *func, void *arg, int priority,
  158             vimage_iterator_func_t);
  159 #endif
  160 
  161 /*
  162  * Standard system event queues.
  163  */
  164 
  165 /* Generic priority levels */
  166 #define EVENTHANDLER_PRI_FIRST  0
  167 #define EVENTHANDLER_PRI_ANY    10000
  168 #define EVENTHANDLER_PRI_LAST   20000
  169 
  170 /* Shutdown events */
  171 typedef void (*shutdown_fn)(void *, int);
  172 
  173 #define SHUTDOWN_PRI_FIRST      EVENTHANDLER_PRI_FIRST
  174 #define SHUTDOWN_PRI_DEFAULT    EVENTHANDLER_PRI_ANY
  175 #define SHUTDOWN_PRI_LAST       EVENTHANDLER_PRI_LAST
  176 
  177 EVENTHANDLER_DECLARE(shutdown_pre_sync, shutdown_fn);   /* before fs sync */
  178 EVENTHANDLER_DECLARE(shutdown_post_sync, shutdown_fn);  /* after fs sync */
  179 EVENTHANDLER_DECLARE(shutdown_final, shutdown_fn);
  180 
  181 /* Low memory event */
  182 typedef void (*vm_lowmem_handler_t)(void *, int);
  183 #define LOWMEM_PRI_DEFAULT      EVENTHANDLER_PRI_FIRST
  184 EVENTHANDLER_DECLARE(vm_lowmem, vm_lowmem_handler_t);
  185 
  186 /* Root mounted event */
  187 typedef void (*mountroot_handler_t)(void *);
  188 EVENTHANDLER_DECLARE(mountroot, mountroot_handler_t);
  189 
  190 /* VLAN state change events */
  191 struct ifnet;
  192 typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
  193 typedef void (*vlan_unconfig_fn)(void *, struct ifnet *, uint16_t);
  194 EVENTHANDLER_DECLARE(vlan_config, vlan_config_fn);
  195 EVENTHANDLER_DECLARE(vlan_unconfig, vlan_unconfig_fn);
  196 
  197 /* BPF attach/detach events */
  198 struct ifnet;
  199 typedef void (*bpf_track_fn)(void *, struct ifnet *, int /* dlt */,
  200     int /* 1 =>'s attach */);
  201 EVENTHANDLER_DECLARE(bpf_track, bpf_track_fn);
  202 
  203 /*
  204  * Process events
  205  * process_fork and exit handlers are called without Giant.
  206  * exec handlers are called with Giant, but that is by accident.
  207  */
  208 struct proc;
  209 struct image_params;
  210 
  211 typedef void (*exitlist_fn)(void *, struct proc *);
  212 typedef void (*forklist_fn)(void *, struct proc *, struct proc *, int);
  213 typedef void (*execlist_fn)(void *, struct proc *, struct image_params *);
  214 typedef void (*proc_ctor_fn)(void *, struct proc *);
  215 typedef void (*proc_dtor_fn)(void *, struct proc *);
  216 typedef void (*proc_init_fn)(void *, struct proc *);
  217 typedef void (*proc_fini_fn)(void *, struct proc *);
  218 EVENTHANDLER_DECLARE(process_ctor, proc_ctor_fn);
  219 EVENTHANDLER_DECLARE(process_dtor, proc_dtor_fn);
  220 EVENTHANDLER_DECLARE(process_init, proc_init_fn);
  221 EVENTHANDLER_DECLARE(process_fini, proc_fini_fn);
  222 EVENTHANDLER_DECLARE(process_exit, exitlist_fn);
  223 EVENTHANDLER_DECLARE(process_fork, forklist_fn);
  224 EVENTHANDLER_DECLARE(process_exec, execlist_fn);
  225 
  226 struct thread;
  227 typedef void (*thread_ctor_fn)(void *, struct thread *);
  228 typedef void (*thread_dtor_fn)(void *, struct thread *);
  229 typedef void (*thread_fini_fn)(void *, struct thread *);
  230 typedef void (*thread_init_fn)(void *, struct thread *);
  231 EVENTHANDLER_DECLARE(thread_ctor, thread_ctor_fn);
  232 EVENTHANDLER_DECLARE(thread_dtor, thread_dtor_fn);
  233 EVENTHANDLER_DECLARE(thread_init, thread_init_fn);
  234 EVENTHANDLER_DECLARE(thread_fini, thread_fini_fn);
  235 
  236 typedef void (*uma_zone_chfn)(void *);
  237 EVENTHANDLER_DECLARE(nmbclusters_change, uma_zone_chfn);
  238 EVENTHANDLER_DECLARE(maxsockets_change, uma_zone_chfn);
  239 
  240 typedef void(*schedtail_fn)(void *, struct proc *);
  241 EVENTHANDLER_DECLARE(schedtail, schedtail_fn);
  242 #endif /* SYS_EVENTHANDLER_H */

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