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/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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 <signal.h>
#include <stdio.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#else
#include <pulsecore/poll.h>
#endif
#include <pulse/xmalloc.h>
#include <pulse/mainloop.h>
#include <pulsecore/log.h>
#include <pulsecore/hashmap.h>
#include <pulsecore/thread.h>
#include <pulsecore/mutex.h>
#include <pulsecore/macro.h>
#include "thread-mainloop.h"
struct pa_threaded_mainloop {
pa_mainloop *real_mainloop;
int n_waiting;
pa_thread* thread;
pa_mutex* mutex;
pa_cond* cond, *accept_cond;
};
static inline int in_worker(pa_threaded_mainloop *m) {
return pa_thread_self() == m->thread;
}
static int poll_func(struct pollfd *ufds, unsigned long nfds, int timeout, void *userdata) {
pa_mutex *mutex = userdata;
int r;
pa_assert(mutex);
/* Before entering poll() we unlock the mutex, so that
* avahi_simple_poll_quit() can succeed from another thread. */
pa_mutex_unlock(mutex);
r = poll(ufds, nfds, timeout);
pa_mutex_lock(mutex);
return r;
}
static void thread(void *userdata) {
pa_threaded_mainloop *m = userdata;
#ifndef OS_IS_WIN32
sigset_t mask;
/* Make sure that signals are delivered to the main thread */
sigfillset(&mask);
pthread_sigmask(SIG_BLOCK, &mask, NULL);
#endif
pa_mutex_lock(m->mutex);
pa_mainloop_run(m->real_mainloop, NULL);
pa_mutex_unlock(m->mutex);
}
pa_threaded_mainloop *pa_threaded_mainloop_new(void) {
pa_threaded_mainloop *m;
m = pa_xnew(pa_threaded_mainloop, 1);
if (!(m->real_mainloop = pa_mainloop_new())) {
pa_xfree(m);
return NULL;
}
m->mutex = pa_mutex_new(TRUE, TRUE);
m->cond = pa_cond_new();
m->accept_cond = pa_cond_new();
m->thread = NULL;
pa_mainloop_set_poll_func(m->real_mainloop, poll_func, m->mutex);
m->n_waiting = 0;
return m;
}
void pa_threaded_mainloop_free(pa_threaded_mainloop* m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert((m->thread && !pa_thread_is_running(m->thread)) || !in_worker(m));
pa_threaded_mainloop_stop(m);
if (m->thread)
pa_thread_free(m->thread);
pa_mainloop_free(m->real_mainloop);
pa_mutex_free(m->mutex);
pa_cond_free(m->cond);
pa_cond_free(m->accept_cond);
pa_xfree(m);
}
int pa_threaded_mainloop_start(pa_threaded_mainloop *m) {
pa_assert(m);
pa_assert(!m->thread || !pa_thread_is_running(m->thread));
if (!(m->thread = pa_thread_new(thread, m)))
return -1;
return 0;
}
void pa_threaded_mainloop_stop(pa_threaded_mainloop *m) {
pa_assert(m);
if (!m->thread || !pa_thread_is_running(m->thread))
return;
/* Make sure that this function is not called from the helper thread */
pa_assert(!in_worker(m));
pa_mutex_lock(m->mutex);
pa_mainloop_quit(m->real_mainloop, 0);
pa_mutex_unlock(m->mutex);
pa_thread_join(m->thread);
}
void pa_threaded_mainloop_lock(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_mutex_lock(m->mutex);
}
void pa_threaded_mainloop_unlock(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_mutex_unlock(m->mutex);
}
void pa_threaded_mainloop_signal(pa_threaded_mainloop *m, int wait_for_accept) {
pa_assert(m);
pa_cond_signal(m->cond, 1);
if (wait_for_accept && m->n_waiting > 0)
pa_cond_wait(m->accept_cond, m->mutex);
}
void pa_threaded_mainloop_wait(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
m->n_waiting ++;
pa_cond_wait(m->cond, m->mutex);
pa_assert(m->n_waiting > 0);
m->n_waiting --;
}
void pa_threaded_mainloop_accept(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_cond_signal(m->accept_cond, 0);
}
int pa_threaded_mainloop_get_retval(pa_threaded_mainloop *m) {
pa_assert(m);
return pa_mainloop_get_retval(m->real_mainloop);
}
pa_mainloop_api* pa_threaded_mainloop_get_api(pa_threaded_mainloop*m) {
pa_assert(m);
return pa_mainloop_get_api(m->real_mainloop);
}
int pa_threaded_mainloop_in_thread(pa_threaded_mainloop *m) {
pa_assert(m);
return m->thread && pa_thread_self() == m->thread;
}
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