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 <pulsecore/macro.h>
28 #include "hook-list.h"
30 void pa_hook_init(pa_hook *hook, void *data) {
33 PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
34 hook->n_dead = hook->n_firing = 0;
38 static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
42 PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
47 void pa_hook_done(pa_hook *hook) {
49 pa_assert(hook->n_firing == 0);
52 slot_free(hook, hook->slots);
54 pa_hook_init(hook, NULL);
57 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data) {
58 pa_hook_slot *slot, *where, *prev;
62 slot = pa_xnew(pa_hook_slot, 1);
67 slot->priority = prio;
70 for (where = hook->slots; where; where = where->next) {
71 if (prio < where->priority)
76 PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, prev, slot);
81 void pa_hook_slot_free(pa_hook_slot *slot) {
83 pa_assert(!slot->dead);
85 if (slot->hook->n_firing > 0) {
89 slot_free(slot->hook, slot);
92 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
93 pa_hook_slot *slot, *next;
94 pa_hook_result_t result = PA_HOOK_OK;
100 PA_LLIST_FOREACH(slot, hook->slots) {
104 if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
109 pa_assert(hook->n_firing >= 0);
111 for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
115 slot_free(hook, slot);
120 pa_assert(hook->n_dead == 0);
125 pa_bool_t pa_hook_is_firing(pa_hook *hook) {
128 return hook->n_firing > 0;