141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/*-
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* Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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MALLOC_DEFINE(M_EVENTHANDLER, "eventhandler", "Event handler records");
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/* List of 'slow' lists */
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static TAILQ_HEAD(, eventhandler_list) eventhandler_lists;
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static int eventhandler_lists_initted = 0;
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struct eventhandler_entry_generic
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{
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struct eventhandler_entry ee;
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void (* func)(void);
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};
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/*
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* Insertion is O(n) due to the priority scan, but optimises to O(1)
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* if all priorities are identical.
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*/
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eventhandler_tag
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eventhandler_register(struct eventhandler_list *list, char *name,
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void *func, void *arg, int priority)
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{
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struct eventhandler_entry_generic *eg;
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struct eventhandler_entry *ep;
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/* avoid the need for a SYSINIT just to init the list */
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if (!eventhandler_lists_initted) {
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TAILQ_INIT(&eventhandler_lists);
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eventhandler_lists_initted = 1;
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}
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/* Do we need to find/create the (slow) list? */
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if (list == NULL) {
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/* look for a matching, existing list */
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list = eventhandler_find_list(name);
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/* Do we need to create the list? */
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if (list == NULL) {
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if ((list = malloc(sizeof(struct eventhandler_list) + strlen(name) + 1,
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M_EVENTHANDLER, M_NOWAIT)) == NULL)
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return(NULL);
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list->el_flags = 0;
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list->el_name = (char *)list + sizeof(struct eventhandler_list);
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strcpy(list->el_name, name);
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TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link);
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}
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}
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if (!(list->el_flags & EHE_INITTED)) {
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TAILQ_INIT(&list->el_entries);
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list->el_flags = EHE_INITTED;
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}
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/* allocate an entry for this handler, populate it */
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if ((eg = malloc(sizeof(struct eventhandler_entry_generic),
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M_EVENTHANDLER, M_NOWAIT)) == NULL)
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return(NULL);
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eg->func = func;
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eg->ee.ee_arg = arg;
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eg->ee.ee_priority = priority;
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/* sort it into the list */
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for (ep = TAILQ_FIRST(&list->el_entries);
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ep != NULL;
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ep = TAILQ_NEXT(ep, ee_link)) {
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if (eg->ee.ee_priority < ep->ee_priority) {
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TAILQ_INSERT_BEFORE(ep, &eg->ee, ee_link);
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break;
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}
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}
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if (ep == NULL)
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TAILQ_INSERT_TAIL(&list->el_entries, &eg->ee, ee_link);
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return(&eg->ee);
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}
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void
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eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag)
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{
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struct eventhandler_entry *ep = tag;
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/* XXX insert diagnostic check here? */
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if (ep != NULL) {
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/* remove just this entry */
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TAILQ_REMOVE(&list->el_entries, ep, ee_link);
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free(ep, M_EVENTHANDLER);
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} else {
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/* remove entire list */
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while (!TAILQ_EMPTY(&list->el_entries)) {
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ep = TAILQ_FIRST(&list->el_entries);
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TAILQ_REMOVE(&list->el_entries, list->el_entries.tqh_first, ee_link);
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free(ep, M_EVENTHANDLER);
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}
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}
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}
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struct eventhandler_list *
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eventhandler_find_list(char *name)
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{
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struct eventhandler_list *list;
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/* scan looking for the requested list */
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for (list = TAILQ_FIRST(&eventhandler_lists);
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list != NULL;
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list = TAILQ_NEXT(list, el_link)) {
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if (!strcmp(name, list->el_name))
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break;
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}
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return(list);
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}
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