2 This file is part of PulseAudio.
4 Copyright 2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <pulse/xmalloc.h>
28 #include <pulsecore/macro.h>
30 #include "hook-list.h"
32 void pa_hook_init(pa_hook *hook, void *data) {
35 PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
36 hook->n_dead = hook->n_firing = 0;
40 static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
44 PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
49 void pa_hook_done(pa_hook *hook) {
51 pa_assert(hook->n_firing == 0);
54 slot_free(hook, hook->slots);
56 pa_hook_init(hook, NULL);
59 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data) {
60 pa_hook_slot *slot, *where, *prev;
64 slot = pa_xnew(pa_hook_slot, 1);
69 slot->priority = prio;
72 for (where = hook->slots; where; where = where->next) {
73 if (prio < where->priority)
78 PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, prev, slot);
83 void pa_hook_slot_free(pa_hook_slot *slot) {
85 pa_assert(!slot->dead);
87 if (slot->hook->n_firing > 0) {
91 slot_free(slot->hook, slot);
94 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
95 pa_hook_slot *slot, *next;
96 pa_hook_result_t result = PA_HOOK_OK;
102 PA_LLIST_FOREACH(slot, hook->slots) {
106 if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
111 pa_assert(hook->n_firing >= 0);
113 for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
117 slot_free(hook, slot);
122 pa_assert(hook->n_dead == 0);
127 pa_bool_t pa_hook_is_firing(pa_hook *hook) {
130 return hook->n_firing > 0;