sys/kern/subr_eventhandler.c

11  *    notice, this list of conditions and the following disclaimer.
13  *    notice, this list of conditions and the following disclaimer in the
55  * Initialize the eventhandler mutex and list.
70 	struct eventhandler_list *list, *new_list;
72 	/* look for a matching, existing list */
73 	list = _eventhandler_find_list(name);
75 	/* Do we need to create the list? */
76 	if (list == NULL) {
84 	    list = _eventhandler_find_list(name);
85 	    if (list != NULL) {
88 		CTR2(KTR_EVH, "%s: creating list \"%s\"", __func__, name);
89 		list = new_list;
90 		TAILQ_INIT(&list->el_entries);
91 		list->el_name = (char *)(list + 1);
92 		strcpy(list->el_name, name);
93 		mtx_init(&list->el_lock, list->el_name, "eventhandler list",
95 		TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link);
98 	return (list);
106 eventhandler_register_internal(struct eventhandler_list *list,
114     /* Do we need to find/create the list? */
115     if (list == NULL) {
117 	    list = eventhandler_find_or_create_list(name);
124     /* sort it into the list */
127     EHL_LOCK(list);
128     TAILQ_FOREACH(ep, &list->el_entries, ee_link) {
136 	TAILQ_INSERT_TAIL(&list->el_entries, epn, ee_link);
137     EHL_UNLOCK(list);
142 eventhandler_register(struct eventhandler_list *list, const char *name,
154     return (eventhandler_register_internal(list, name, &eg->ee));
166 vimage_eventhandler_register(struct eventhandler_list *list, const char *name,
180     return (eventhandler_register_internal(list, name, &eg->ee));
185 _eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag,
190     EHL_LOCK_ASSERT(list, MA_OWNED);
193 	if (list->el_runcount == 0) {
195 		list->el_name);
196 	    TAILQ_REMOVE(&list->el_entries, ep, ee_link);
200 		ep, list->el_name);
204 	/* remove entire list */
205 	if (list->el_runcount == 0) {
207 		list->el_name);
208 	    while (!TAILQ_EMPTY(&list->el_entries)) {
209 		ep = TAILQ_FIRST(&list->el_entries);
210 		TAILQ_REMOVE(&list->el_entries, ep, ee_link);
215 		__func__, list->el_name);
216 	    TAILQ_FOREACH(ep, &list->el_entries, ee_link)
220     while (wait && list->el_runcount > 0)
221 	    mtx_sleep(list, &list->el_lock, 0, "evhrm", 0);
222     EHL_UNLOCK(list);
226 eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag)
229 	_eventhandler_deregister(list, tag, true);
233 eventhandler_deregister_nowait(struct eventhandler_list *list,
237 	_eventhandler_deregister(list, tag, false);
241  * Internal version for use when eventhandler list is already locked.
246     struct eventhandler_list	*list;
249     TAILQ_FOREACH(list, &eventhandler_lists, el_link) {
250 	if (!strcmp(name, list->el_name))
253     return (list);
257  * Lookup a "slow" list by name.  Returns with the list locked.
262     struct eventhandler_list	*list;
267     /* scan looking for the requested list */
269     list = _eventhandler_find_list(name);
270     if (list != NULL)
271 	EHL_LOCK(list);
274     return(list);
278  * Prune "dead" entries from an eventhandler list.
281 eventhandler_prune_list(struct eventhandler_list *list)
286     CTR2(KTR_EVH, "%s: pruning list \"%s\"", __func__, list->el_name);
287     EHL_LOCK_ASSERT(list, MA_OWNED);
288     TAILQ_FOREACH_SAFE(ep, &list->el_entries, ee_link, en) {
290 	    TAILQ_REMOVE(&list->el_entries, ep, ee_link);
296 	    wakeup(list);
300  * Create (or get the existing) list so the pointer can be stored by
306 	struct eventhandler_list *list;
309 	    ("eventhandler list created too early"));
312 	list = eventhandler_find_or_create_list(name);
315 	return (list);