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/***
This file is part of avahi.
avahi 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.
avahi 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 avahi; 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 <sys/poll.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <pthread.h>
#include <signal.h>
#include "llist.h"
#include "malloc.h"
#include "timeval.h"
#include "simple-watch.h"
#include "thread-watch.h"
struct AvahiThreadedPoll {
AvahiSimplePoll *simple_poll;
pthread_t thread_id;
pthread_mutex_t mutex;
int thread_running;
int retval;
};
static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
pthread_mutex_t *mutex = userdata;
int r;
/* Before entering poll() we unlock the mutex, so that
* avahi_simple_poll_quit() can succeed from another thread. */
pthread_mutex_unlock(mutex);
r = poll(ufds, nfds, timeout);
pthread_mutex_lock(mutex);
return r;
}
static void* thread(void *userdata){
AvahiThreadedPoll *p = userdata;
sigset_t mask;
/* Make sure that signals are delivered to the main thread */
sigfillset(&mask);
pthread_sigmask(SIG_BLOCK, &mask, NULL);
pthread_mutex_lock(&p->mutex);
p->retval = avahi_simple_poll_loop(p->simple_poll);
pthread_mutex_unlock(&p->mutex);
return NULL;
}
AvahiThreadedPoll *avahi_threaded_poll_new(void) {
AvahiThreadedPoll *p;
if (!(p = avahi_new(AvahiThreadedPoll, 1)))
goto fail; /* OOM */
if (!(p->simple_poll = avahi_simple_poll_new()))
goto fail;
pthread_mutex_init(&p->mutex, NULL);
avahi_simple_poll_set_func(p->simple_poll, poll_func, &p->mutex);
p->thread_running = 0;
return p;
fail:
if (p) {
if (p->simple_poll) {
avahi_simple_poll_free(p->simple_poll);
pthread_mutex_destroy(&p->mutex);
}
avahi_free(p);
}
return NULL;
}
void avahi_threaded_poll_free(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
if (p->thread_running)
avahi_threaded_poll_stop(p);
if (p->simple_poll)
avahi_simple_poll_free(p->simple_poll);
pthread_mutex_destroy(&p->mutex);
avahi_free(p);
}
const AvahiPoll* avahi_threaded_poll_get(AvahiThreadedPoll *p) {
assert(p);
return avahi_simple_poll_get(p->simple_poll);
}
int avahi_threaded_poll_start(AvahiThreadedPoll *p) {
assert(p);
assert(!p->thread_running);
if (pthread_create(&p->thread_id, NULL, thread, p) < 0)
return -1;
p->thread_running = 1;
return 0;
}
int avahi_threaded_poll_stop(AvahiThreadedPoll *p) {
assert(p);
if (!p->thread_running)
return -1;
/* Make sure that this function is not called from the helper thread */
assert(!pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_lock(&p->mutex);
avahi_simple_poll_quit(p->simple_poll);
pthread_mutex_unlock(&p->mutex);
pthread_join(p->thread_id, NULL);
p->thread_running = 0;
return p->retval;
}
void avahi_threaded_poll_quit(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is called from the helper thread */
assert(pthread_equal(pthread_self(), p->thread_id));
avahi_simple_poll_quit(p->simple_poll);
}
void avahi_threaded_poll_lock(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_lock(&p->mutex);
}
void avahi_threaded_poll_unlock(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_unlock(&p->mutex);
}
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