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-rw-r--r--src/pulse/thread-mainloop.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/src/pulse/thread-mainloop.c b/src/pulse/thread-mainloop.c
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+++ b/src/pulse/thread-mainloop.c
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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 2.1 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef OS_IS_WIN32
+#include <pthread.h>
+#endif
+
+#include <signal.h>
+#include <stdio.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/mainloop.h>
+
+#include <pulsecore/i18n.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/mutex.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/poll.h>
+
+#include "thread-mainloop.h"
+
+struct pa_threaded_mainloop {
+ pa_mainloop *real_mainloop;
+ volatile int n_waiting, n_waiting_for_accept;
+ pa_atomic_t in_once_unlocked;
+
+ pa_thread* thread;
+ pa_mutex* mutex;
+ pa_cond* cond, *accept_cond;
+
+ char *name;
+};
+
+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 = pa_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;
+ sigset_t prev_mask;
+ struct sigaction sa;
+
+ sigfillset(&mask);
+
+ /* If SIGSYS is currently unblocked and trapped then keep it unblocked. */
+ if (!pthread_sigmask(SIG_SETMASK, NULL, &prev_mask) &&
+ !sigismember(&prev_mask, SIGSYS) &&
+ !sigaction(SIGSYS, NULL, &sa)
+ && sa.sa_handler != SIG_DFL) {
+ sigdelset(&mask, SIGSYS);
+ }
+
+ /* Make sure that signals are delivered to the main thread.
+ * Use SIG_SETMASK because SIG_BLOCK does an union with current set.*/
+ pthread_sigmask(SIG_SETMASK, &mask, NULL);
+#endif
+
+ pa_mutex_lock(m->mutex);
+
+ (void) pa_mainloop_run(m->real_mainloop, NULL);
+
+ pa_mutex_unlock(m->mutex);
+}
+
+pa_threaded_mainloop *pa_threaded_mainloop_new(void) {
+ pa_threaded_mainloop *m;
+
+ pa_init_i18n();
+
+ m = pa_xnew0(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();
+
+ pa_mainloop_set_poll_func(m->real_mainloop, poll_func, m->mutex);
+
+ 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->name);
+ 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(m->name ? m->name : "threaded-ml", 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, unless it is unlocked */
+ pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m) || pa_atomic_load(&m->in_once_unlocked));
+
+ 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, unless it is unlocked */
+ pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m) || pa_atomic_load(&m->in_once_unlocked));
+
+ pa_mutex_unlock(m->mutex);
+}
+
+/* Called with the lock taken */
+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_for_accept ++;
+
+ while (m->n_waiting_for_accept > 0)
+ pa_cond_wait(m->accept_cond, m->mutex);
+ }
+}
+
+/* Called with the lock taken */
+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 --;
+}
+
+/* Called with the lock taken */
+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_assert(m->n_waiting_for_accept > 0);
+ m->n_waiting_for_accept --;
+
+ pa_cond_signal(m->accept_cond, 0);
+}
+
+int pa_threaded_mainloop_get_retval(const 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;
+}
+
+void pa_threaded_mainloop_set_name(pa_threaded_mainloop *m, const char *name) {
+ pa_assert(m);
+ pa_assert(name);
+
+ m->name = pa_xstrdup(name);
+
+ if (m->thread)
+ pa_thread_set_name(m->thread, m->name);
+}
+
+typedef struct {
+ pa_threaded_mainloop *mainloop;
+ void (*callback)(pa_threaded_mainloop *m, void *userdata);
+ void *userdata;
+} once_unlocked_data;
+
+static void once_unlocked_cb(pa_mainloop_api *api, void *userdata) {
+ once_unlocked_data *data = userdata;
+
+ pa_assert(userdata);
+
+ pa_atomic_store(&data->mainloop->in_once_unlocked, 1);
+ pa_mutex_unlock(data->mainloop->mutex);
+
+ data->callback(data->mainloop, data->userdata);
+
+ pa_mutex_lock(data->mainloop->mutex);
+ pa_atomic_store(&data->mainloop->in_once_unlocked, 0);
+}
+
+void pa_threaded_mainloop_once_unlocked(pa_threaded_mainloop *m, void (*callback)(pa_threaded_mainloop *m, void *userdata),
+ void *userdata) {
+ pa_mainloop_api *api;
+ once_unlocked_data *data;
+
+ pa_assert(m);
+ pa_assert(callback);
+ /* 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));
+
+ api = pa_mainloop_get_api(m->real_mainloop);
+ data = pa_xnew0(once_unlocked_data, 1);
+
+ data->mainloop = m;
+ data->callback = callback;
+ data->userdata = userdata;
+
+ pa_mainloop_api_once(api, once_unlocked_cb, data);
+}