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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 2.1 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
Lesser 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 <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <pulse/xmalloc.h>
#include "anotify.h"
#define EVENTS_MAX 16
struct pa_anotify {
pa_mainloop_api *api;
pa_anotify_cb_t callback;
void *userdata;
int fds[2];
pa_io_event *io_event;
pa_defer_event *defer_event;
uint8_t queued_events[EVENTS_MAX];
unsigned n_queued_events, queue_index;
};
static void dispatch_event(pa_anotify *a) {
assert(a);
assert(a->queue_index < a->n_queued_events);
a->callback(a->queued_events[a->queue_index++], a->userdata);
if (a->queue_index >= a->n_queued_events) {
a->n_queued_events = 0;
a->queue_index = 0;
a->api->io_enable(a->io_event, PA_IO_EVENT_INPUT);
a->api->defer_enable(a->defer_event, 0);
} else {
a->api->io_enable(a->io_event, 0);
a->api->defer_enable(a->defer_event, 1);
}
}
static void io_callback(
pa_mainloop_api *api,
pa_io_event *e,
int fd,
pa_io_event_flags_t events,
void *userdata) {
pa_anotify *a = userdata;
ssize_t r;
assert(a);
assert(events == PA_IO_EVENT_INPUT);
assert(a->n_queued_events == 0);
r = read(fd, a->queued_events, sizeof(a->queued_events));
assert(r > 0);
a->n_queued_events = (unsigned) r;
a->queue_index = 0;
/* Only dispatch a single event */
dispatch_event(a);
}
static void defer_callback(pa_mainloop_api *api, pa_defer_event *e, void *userdata) {
pa_anotify *a = userdata;
assert(a);
dispatch_event(a);
}
pa_anotify *pa_anotify_new(pa_mainloop_api*api, pa_anotify_cb_t cb, void *userdata) {
pa_anotify *a;
assert(api);
assert(cb);
a = pa_xnew(pa_anotify, 1);
if (pipe(a->fds) < 0) {
pa_xfree(a);
return NULL;
}
a->api = api;
a->callback = cb;
a->userdata = userdata;
a->io_event = api->io_new(api, a->fds[0], PA_IO_EVENT_INPUT, io_callback, a);
a->defer_event = api->defer_new(api, defer_callback, a);
a->api->defer_enable(a->defer_event, 0);
a->n_queued_events = 0;
return a;
}
void pa_anotify_free(pa_anotify *a) {
assert(a);
a->api->io_free(a->io_event);
a->api->defer_free(a->defer_event);
if (a->fds[0] >= 0)
close(a->fds[0]);
if (a->fds[1] >= 0)
close(a->fds[1]);
pa_xfree(a);
}
int pa_anotify_signal(pa_anotify *a, uint8_t event) {
ssize_t r;
assert(a);
r = write(a->fds[1], &event, 1);
return r != 1 ? -1 : 0;
}
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