diff --git a/sd/Library_sd.mk b/sd/Library_sd.mk index 807926fa6994..848442355fbd 100644 --- a/sd/Library_sd.mk +++ b/sd/Library_sd.mk @@ -553,6 +553,14 @@ ifeq ($(ENABLE_AVAHI),TRUE) $(eval $(call gb_Library_add_exception_objects,sd,\ sd/source/ui/remotecontrol/AvahiNetworkService \ )) + +$(eval $(call gb_Library_add_cobjects,sd,\ + sd/source/ui/remotecontrol/avahi-common/thread-watch \ +)) + +$(eval $(call gb_Library_add_libs,sd,\ + -lpthread \ +)) endif $(eval $(call gb_Library_add_exception_objects,sd,\ diff --git a/sd/source/ui/remotecontrol/AvahiNetworkService.cxx b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx index 5cb52de68749..6043d49b2fbb 100644 --- a/sd/source/ui/remotecontrol/AvahiNetworkService.cxx +++ b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx @@ -10,7 +10,7 @@ #include #include #include -#include +#include "avahi-common/thread-watch.h" #include "AvahiNetworkService.hxx" #include "ZeroconfService.hxx" diff --git a/sd/source/ui/remotecontrol/avahi-common/thread-watch.c b/sd/source/ui/remotecontrol/avahi-common/thread-watch.c new file mode 100644 index 000000000000..4bb277f53ee0 --- /dev/null +++ b/sd/source/ui/remotecontrol/avahi-common/thread-watch.c @@ -0,0 +1,191 @@ +/* $Id$ */ + +/*** + 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 +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +// Only introduced in 0.6.13. Place it here as advised by avahi maintainer +#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); +} \ No newline at end of file diff --git a/sd/source/ui/remotecontrol/avahi-common/thread-watch.h b/sd/source/ui/remotecontrol/avahi-common/thread-watch.h new file mode 100644 index 000000000000..0f0a12d490bc --- /dev/null +++ b/sd/source/ui/remotecontrol/avahi-common/thread-watch.h @@ -0,0 +1,82 @@ +#ifndef foothreadedwatchhfoo +#define foothreadedwatchhfoo + +/* $Id$ */ + +/*** + 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. +***/ + +/** \file thread-watch.h Threaded poll() based main loop implementation */ + +#include +#include +#include + +AVAHI_C_DECL_BEGIN + +/** A main loop object that runs an AvahiSimplePoll in its own thread. \since 0.6.4 */ +typedef struct AvahiThreadedPoll AvahiThreadedPoll; + +/** Create a new event loop object. This will allocate the internal + * AvahiSimplePoll, but will not start the helper thread. \since 0.6.4 */ +AvahiThreadedPoll *avahi_threaded_poll_new(void); + +/** Free an event loop object. This will stop the associated event loop + * thread (if it is running). \since 0.6.4 */ +void avahi_threaded_poll_free(AvahiThreadedPoll *p); + +/** Return the abstracted poll API object for this event loop + * object. The will return the same pointer each time it is + * called. \since 0.6.4 */ +const AvahiPoll* avahi_threaded_poll_get(AvahiThreadedPoll *p); + +/** Start the event loop helper thread. After the thread has started + * you must make sure to access the event loop object + * (AvahiThreadedPoll, AvahiPoll and all its associated objects) + * synchronized, i.e. with proper locking. You may want to use + * avahi_threaded_poll_lock()/avahi_threaded_poll_unlock() for this, + * which will lock the the entire event loop. Please note that event + * loop callback functions are called from the event loop helper thread + * with that lock held, i.e. avahi_threaded_poll_lock() calls are not + * required from event callbacks. \since 0.6.4 */ +int avahi_threaded_poll_start(AvahiThreadedPoll *p); + +/** Request that the event loop quits and the associated thread + stops. Call this from outside the helper thread if you want to shut + it down. \since 0.6.4 */ +int avahi_threaded_poll_stop(AvahiThreadedPoll *p); + +/** Request that the event loop quits and the associated thread + stops. Call this from inside the helper thread if you want to shut it + down. \since 0.6.4 */ +void avahi_threaded_poll_quit(AvahiThreadedPoll *p); + +/** Lock the main loop object. Use this if you want to access the event + * loop objects (such as creating a new event source) from anything + * else but the event loop helper thread, i.e. from anything else but event + * loop callbacks \since 0.6.4 */ +void avahi_threaded_poll_lock(AvahiThreadedPoll *p); + +/** Unlock the event loop object, use this as counterpart to + * avahi_threaded_poll_lock() \since 0.6.4 */ +void avahi_threaded_poll_unlock(AvahiThreadedPoll *p); + +AVAHI_C_DECL_END + +#endif \ No newline at end of file