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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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.
polypaudio 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 polypaudio; 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 <stdio.h>
#include <assert.h>
#include "queue.h"
#include "subscribe.h"
#include "xmalloc.h"
#include "log.h"
/* The subscription subsystem may be used to be notified whenever an
* entity (sink, source, ...) is created or deleted. Modules may
* register a callback function that is called whenever an event
* matching a subscription mask happens. The execution of the callback
* function is postponed to the next main loop iteration, i.e. is not
* called from within the stack frame the entity was created in. */
struct pa_subscription {
struct pa_core *core;
int dead;
void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata);
void *userdata;
enum pa_subscription_mask mask;
struct pa_subscription *prev, *next;
};
struct pa_subscription_event {
enum pa_subscription_event_type type;
uint32_t index;
};
static void sched_event(struct pa_core *c);
/* Allocate a new subscription object for the given subscription mask. Use the specified callback function and user data */
struct pa_subscription* pa_subscription_new(struct pa_core *c, enum pa_subscription_mask m, void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata), void *userdata) {
struct pa_subscription *s;
assert(c);
s = pa_xmalloc(sizeof(struct pa_subscription));
s->core = c;
s->dead = 0;
s->callback = callback;
s->userdata = userdata;
s->mask = m;
if ((s->next = c->subscriptions))
s->next->prev = s;
s->prev = NULL;
c->subscriptions = s;
return s;
}
/* Free a subscription object, effectively marking it for deletion */
void pa_subscription_free(struct pa_subscription*s) {
assert(s && !s->dead);
s->dead = 1;
sched_event(s->core);
}
static void free_item(struct pa_subscription *s) {
assert(s && s->core);
if (s->prev)
s->prev->next = s->next;
else
s->core->subscriptions = s->next;
if (s->next)
s->next->prev = s->prev;
pa_xfree(s);
}
/* Free all subscription objects */
void pa_subscription_free_all(struct pa_core *c) {
struct pa_subscription_event *e;
assert(c);
while (c->subscriptions)
free_item(c->subscriptions);
if (c->subscription_event_queue) {
while ((e = pa_queue_pop(c->subscription_event_queue)))
pa_xfree(e);
pa_queue_free(c->subscription_event_queue, NULL, NULL);
c->subscription_event_queue = NULL;
}
if (c->subscription_defer_event) {
c->mainloop->defer_free(c->subscription_defer_event);
c->subscription_defer_event = NULL;
}
}
/*static void dump_event(struct pa_subscription_event*e) {
switch (e->type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
case PA_SUBSCRIPTION_EVENT_SINK:
pa_log(__FILE__": SINK_EVENT");
break;
case PA_SUBSCRIPTION_EVENT_SOURCE:
pa_log(__FILE__": SOURCE_EVENT");
break;
case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
pa_log(__FILE__": SINK_INPUT_EVENT");
break;
case PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT:
pa_log(__FILE__": SOURCE_OUTPUT_EVENT");
break;
case PA_SUBSCRIPTION_EVENT_MODULE:
pa_log(__FILE__": MODULE_EVENT");
break;
case PA_SUBSCRIPTION_EVENT_CLIENT:
pa_log(__FILE__": CLIENT_EVENT");
break;
default:
pa_log(__FILE__": OTHER");
break;
}
switch (e->type & PA_SUBSCRIPTION_EVENT_TYPE_MASK) {
case PA_SUBSCRIPTION_EVENT_NEW:
pa_log(__FILE__": NEW");
break;
case PA_SUBSCRIPTION_EVENT_CHANGE:
pa_log(__FILE__": CHANGE");
break;
case PA_SUBSCRIPTION_EVENT_REMOVE:
pa_log(__FILE__": REMOVE");
break;
default:
pa_log(__FILE__": OTHER");
break;
}
pa_log(__FILE__": %u\n", e->index);
}*/
/* Deferred callback for dispatching subscirption events */
static void defer_cb(struct pa_mainloop_api *m, struct pa_defer_event *e, void *userdata) {
struct pa_core *c = userdata;
struct pa_subscription *s;
assert(c && c->subscription_defer_event == e && c->mainloop == m);
c->mainloop->defer_enable(c->subscription_defer_event, 0);
/* Dispatch queued events */
if (c->subscription_event_queue) {
struct pa_subscription_event *e;
while ((e = pa_queue_pop(c->subscription_event_queue))) {
struct pa_subscription *s;
for (s = c->subscriptions; s; s = s->next) {
if (!s->dead && pa_subscription_match_flags(s->mask, e->type))
s->callback(c, e->type, e->index, s->userdata);
}
pa_xfree(e);
}
}
/* Remove dead subscriptions */
s = c->subscriptions;
while (s) {
struct pa_subscription *n = s->next;
if (s->dead)
free_item(s);
s = n;
}
}
/* Schedule an mainloop event so that a pending subscription event is dispatched */
static void sched_event(struct pa_core *c) {
assert(c);
if (!c->subscription_defer_event) {
c->subscription_defer_event = c->mainloop->defer_new(c->mainloop, defer_cb, c);
assert(c->subscription_defer_event);
}
c->mainloop->defer_enable(c->subscription_defer_event, 1);
}
/* Append a new subscription event to the subscription event queue and schedule a main loop event */
void pa_subscription_post(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index) {
struct pa_subscription_event *e;
assert(c);
e = pa_xmalloc(sizeof(struct pa_subscription_event));
e->type = t;
e->index = index;
if (!c->subscription_event_queue) {
c->subscription_event_queue = pa_queue_new();
assert(c->subscription_event_queue);
}
pa_queue_push(c->subscription_event_queue, e);
sched_event(c);
}
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