sys/kern/subr_eventhandler.c

9  *    notice, this list of conditions and the following disclaimer.
11  *    notice, this list of conditions and the following disclaimer in the
55  * Initialize the eventhandler mutex and list.
72 eventhandler_register_internal(struct eventhandler_list *list,
84     /* Do we need to find/create the (slow) list? */
85     if (list == NULL) {
86 	/* look for a matching, existing list */
87 	list = _eventhandler_find_list(name);
89 	/* Do we need to create the list? */
90 	if (list == NULL) {
98 	    list = _eventhandler_find_list(name);
99 	    if (list != NULL) {
102 		CTR2(KTR_EVH, "%s: creating list \"%s\"", __func__, name);
103 		list = new_list;
104 		list->el_flags = 0;
105 		list->el_runcount = 0;
106 		bzero(&list->el_lock, sizeof(list->el_lock));
107 		list->el_name = (char *)list + sizeof(struct eventhandler_list);
108 		strcpy(list->el_name, name);
109 		TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link);
113     if (!(list->el_flags & EHL_INITTED)) {
114 	TAILQ_INIT(&list->el_entries);
115 	mtx_init(&list->el_lock, name, "eventhandler list", MTX_DEF);
116 	atomic_store_rel_int(&list->el_flags, EHL_INITTED);
123     /* sort it into the list */
126     EHL_LOCK(list);
127     TAILQ_FOREACH(ep, &list->el_entries, ee_link) {
135 	TAILQ_INSERT_TAIL(&list->el_entries, epn, ee_link);
136     EHL_UNLOCK(list);
141 eventhandler_register(struct eventhandler_list *list, const char *name,
153     return (eventhandler_register_internal(list, name, &eg->ee));
165 vimage_eventhandler_register(struct eventhandler_list *list, const char *name,
179     return (eventhandler_register_internal(list, name, &eg->ee));
184 eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag)
188     EHL_LOCK_ASSERT(list, MA_OWNED);
191 	if (list->el_runcount == 0) {
193 		list->el_name);
194 	    TAILQ_REMOVE(&list->el_entries, ep, ee_link);
198 		ep, list->el_name);
202 	/* remove entire list */
203 	if (list->el_runcount == 0) {
205 		list->el_name);
206 	    while (!TAILQ_EMPTY(&list->el_entries)) {
207 		ep = TAILQ_FIRST(&list->el_entries);
208 		TAILQ_REMOVE(&list->el_entries, ep, ee_link);
213 		__func__, list->el_name);
214 	    TAILQ_FOREACH(ep, &list->el_entries, ee_link)
218     while (list->el_runcount > 0)
219 	    mtx_sleep(list, &list->el_lock, 0, "evhrm", 0);
220     EHL_UNLOCK(list);
224  * Internal version for use when eventhandler list is already locked.
229     struct eventhandler_list	*list;
232     TAILQ_FOREACH(list, &eventhandler_lists, el_link) {
233 	if (!strcmp(name, list->el_name))
236     return (list);
240  * Lookup a "slow" list by name.  Returns with the list locked.
245     struct eventhandler_list	*list;
250     /* scan looking for the requested list */
252     list = _eventhandler_find_list(name);
253     if (list != NULL)
254 	EHL_LOCK(list);
257     return(list);
261  * Prune "dead" entries from an eventhandler list.
264 eventhandler_prune_list(struct eventhandler_list *list)
269     CTR2(KTR_EVH, "%s: pruning list \"%s\"", __func__, list->el_name);
270     EHL_LOCK_ASSERT(list, MA_OWNED);
271     TAILQ_FOREACH_SAFE(ep, &list->el_entries, ee_link, en) {
273 	    TAILQ_REMOVE(&list->el_entries, ep, ee_link);
279 	    wakeup(list);