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/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <pulsecore/hook-list.h>
void pa_hook_init(pa_hook *hook, void *data) {
assert(hook);
PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
hook->last = NULL;
hook->n_dead = hook->firing = 0;
hook->data = data;
}
static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
assert(hook);
assert(slot);
if (hook->last == slot)
hook->last = slot->prev;
PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
pa_xfree(slot);
}
void pa_hook_free(pa_hook *hook) {
assert(hook);
assert(!hook->firing);
while (hook->slots)
slot_free(hook, hook->slots);
pa_hook_init(hook, NULL);
}
pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_cb_t cb, void *data) {
pa_hook_slot *slot;
assert(cb);
slot = pa_xnew(pa_hook_slot, 1);
slot->hook = hook;
slot->dead = 0;
slot->callback = cb;
slot->data = data;
PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, hook->last, slot);
hook->last = slot;
return slot;
}
void pa_hook_slot_free(pa_hook_slot *slot) {
assert(slot);
assert(!slot->dead);
if (slot->hook->firing > 0) {
slot->dead = 1;
slot->hook->n_dead++;
} else
slot_free(slot->hook, slot);
}
pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
pa_hook_slot *slot, *next;
pa_hook_result_t result = PA_HOOK_OK;
assert(hook);
hook->firing ++;
for (slot = hook->slots; slot; slot = slot->next) {
if (slot->dead)
continue;
if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
break;
}
hook->firing --;
for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
next = slot->next;
if (slot->dead) {
slot_free(hook, slot);
hook->n_dead--;
}
}
return result;
}
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