Adding upstream version 14.2.upstream/14.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 301 insertions, 0 deletions

diff --git a/src/pulse/thread-mainloop.c b/src/pulse/thread-mainloop.c
new file mode 100644
index 0000000..495cc1e
--- /dev/null
+++ b/src/pulse/thread-mainloop.c
@@ -0,0 +1,301 @@
+/***
+  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);
+}