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/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
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.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulsecore/macro.h>
#include "hook-list.h"
void pa_hook_init(pa_hook *hook, void *data) {
pa_assert(hook);
PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
hook->n_dead = hook->n_firing = 0;
hook->data = data;
}
static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
pa_assert(hook);
pa_assert(slot);
PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
pa_xfree(slot);
}
void pa_hook_free(pa_hook *hook) {
pa_assert(hook);
pa_assert(hook->n_firing == 0);
while (hook->slots)
slot_free(hook, hook->slots);
pa_hook_init(hook, NULL);
}
pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data) {
pa_hook_slot *slot, *where, *prev;
pa_assert(cb);
slot = pa_xnew(pa_hook_slot, 1);
slot->hook = hook;
slot->dead = FALSE;
slot->callback = cb;
slot->data = data;
slot->priority = prio;
prev = NULL;
for (where = hook->slots; where; where = where->next) {
if (prio < where->priority)
break;
prev = where;
}
PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, prev, slot);
return slot;
}
void pa_hook_slot_free(pa_hook_slot *slot) {
pa_assert(slot);
pa_assert(!slot->dead);
if (slot->hook->n_firing > 0) {
slot->dead = TRUE;
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;
pa_assert(hook);
hook->n_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->n_firing --;
pa_assert(hook->n_firing >= 0);
for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
next = slot->next;
if (slot->dead) {
slot_free(hook, slot);
hook->n_dead--;
}
}
pa_assert(hook->n_dead == 0);
return result;
}
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