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bus: make the bus almost lockfree
Use new GstPoll functionality to wakeup the mainloop. Use an atomic queue on the writer side to post the messages. The reader side it protected with the lock still because we don't want multiple concurrent readers.
This commit is contained in:
Wim Taymans
parent
401d73df7f
commit
14d7db1b52
2 changed files with 48 additions and 99 deletions
144
gst/gstbus.c
144
gst/gstbus.c
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@ -75,6 +75,7 @@
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#include <sys/types.h>
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#include "gstinfo.h"
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#include "gstpoll.h"
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#include "gstbus.h"
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@ -90,8 +91,6 @@ enum
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static void gst_bus_dispose (GObject * object);
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static void gst_bus_set_main_context (GstBus * bus, GMainContext * ctx);
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static GstObjectClass *parent_class = NULL;
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static guint gst_bus_signals[LAST_SIGNAL] = { 0 };
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@ -100,7 +99,9 @@ struct _GstBusPrivate
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guint num_sync_message_emitters;
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GCond *queue_cond;
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GSource *watch_id;
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GMainContext *main_context;
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GstPoll *poll;
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GPollFD pollfd;
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};
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G_DEFINE_TYPE (GstBus, gst_bus, GST_TYPE_OBJECT);
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@ -184,12 +185,15 @@ gst_bus_class_init (GstBusClass * klass)
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static void
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gst_bus_init (GstBus * bus)
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{
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bus->queue = g_queue_new ();
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bus->queue = gst_atomic_queue_new (32);
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bus->queue_lock = g_mutex_new ();
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bus->priv = G_TYPE_INSTANCE_GET_PRIVATE (bus, GST_TYPE_BUS, GstBusPrivate);
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bus->priv->queue_cond = g_cond_new ();
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bus->priv->poll = gst_poll_new_timer ();
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gst_poll_get_read_gpollfd (bus->priv->poll, &bus->priv->pollfd);
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GST_DEBUG_OBJECT (bus, "created");
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}
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@ -203,63 +207,24 @@ gst_bus_dispose (GObject * object)
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g_mutex_lock (bus->queue_lock);
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do {
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message = g_queue_pop_head (bus->queue);
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message = gst_atomic_queue_pop (bus->queue);
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if (message)
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gst_message_unref (message);
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} while (message != NULL);
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g_queue_free (bus->queue);
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gst_atomic_queue_unref (bus->queue);
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bus->queue = NULL;
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g_mutex_unlock (bus->queue_lock);
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g_mutex_free (bus->queue_lock);
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bus->queue_lock = NULL;
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g_cond_free (bus->priv->queue_cond);
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bus->priv->queue_cond = NULL;
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}
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if (bus->priv->main_context) {
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g_main_context_unref (bus->priv->main_context);
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bus->priv->main_context = NULL;
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gst_poll_free (bus->priv->poll);
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}
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_bus_wakeup_main_context (GstBus * bus)
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{
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GMainContext *ctx;
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GST_OBJECT_LOCK (bus);
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if ((ctx = bus->priv->main_context))
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g_main_context_ref (ctx);
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GST_OBJECT_UNLOCK (bus);
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g_main_context_wakeup (ctx);
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if (ctx)
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g_main_context_unref (ctx);
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}
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static void
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gst_bus_set_main_context (GstBus * bus, GMainContext * ctx)
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{
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GST_OBJECT_LOCK (bus);
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if (bus->priv->main_context != NULL) {
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g_main_context_unref (bus->priv->main_context);
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bus->priv->main_context = NULL;
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}
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if (ctx != NULL) {
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bus->priv->main_context = g_main_context_ref (ctx);
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}
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GST_DEBUG_OBJECT (bus, "setting main context to %p, GLib default context: %p",
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ctx, g_main_context_default ());
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GST_OBJECT_UNLOCK (bus);
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}
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/**
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* gst_bus_new:
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*
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@ -335,14 +300,10 @@ gst_bus_post (GstBus * bus, GstMessage * message)
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case GST_BUS_PASS:
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/* pass the message to the async queue, refcount passed in the queue */
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GST_DEBUG_OBJECT (bus, "[msg %p] pushing on async queue", message);
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g_mutex_lock (bus->queue_lock);
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g_queue_push_tail (bus->queue, message);
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g_cond_broadcast (bus->priv->queue_cond);
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g_mutex_unlock (bus->queue_lock);
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gst_atomic_queue_push (bus->queue, message);
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gst_poll_write_control (bus->priv->poll);
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GST_DEBUG_OBJECT (bus, "[msg %p] pushed on async queue", message);
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gst_bus_wakeup_main_context (bus);
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break;
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case GST_BUS_ASYNC:
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{
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@ -360,12 +321,9 @@ gst_bus_post (GstBus * bus, GstMessage * message)
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* queue. When the message is handled by the app and destroyed,
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* the cond will be signalled and we can continue */
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g_mutex_lock (lock);
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g_mutex_lock (bus->queue_lock);
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g_queue_push_tail (bus->queue, message);
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g_cond_broadcast (bus->priv->queue_cond);
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g_mutex_unlock (bus->queue_lock);
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gst_bus_wakeup_main_context (bus);
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gst_atomic_queue_push (bus->queue, message);
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gst_poll_write_control (bus->priv->poll);
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/* now block till the message is freed */
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g_cond_wait (cond, lock);
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@ -413,10 +371,8 @@ gst_bus_have_pending (GstBus * bus)
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g_return_val_if_fail (GST_IS_BUS (bus), FALSE);
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g_mutex_lock (bus->queue_lock);
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/* see if there is a message on the bus */
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result = !g_queue_is_empty (bus->queue);
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g_mutex_unlock (bus->queue_lock);
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result = gst_atomic_queue_length (bus->queue) != 0;
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return result;
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}
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@ -482,7 +438,7 @@ gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
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GstMessageType types)
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{
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GstMessage *message;
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GTimeVal *timeval, abstimeout;
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GTimeVal now, then;
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gboolean first_round = TRUE;
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g_return_val_if_fail (GST_IS_BUS (bus), NULL);
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@ -491,9 +447,13 @@ gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
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g_mutex_lock (bus->queue_lock);
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while (TRUE) {
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GST_LOG_OBJECT (bus, "have %d messages", g_queue_get_length (bus->queue));
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gint ret;
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while ((message = g_queue_pop_head (bus->queue))) {
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GST_LOG_OBJECT (bus, "have %d messages",
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gst_atomic_queue_length (bus->queue));
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while ((message = gst_atomic_queue_pop (bus->queue))) {
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gst_poll_read_control (bus->priv->poll);
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GST_DEBUG_OBJECT (bus, "got message %p, %s, type mask is %u",
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message, GST_MESSAGE_TYPE_NAME (message), (guint) types);
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if ((GST_MESSAGE_TYPE (message) & types) != 0) {
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@ -510,28 +470,28 @@ gst_bus_timed_pop_filtered (GstBus * bus, GstClockTime timeout,
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if (timeout == 0)
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break;
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if (timeout == GST_CLOCK_TIME_NONE) {
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/* wait forever */
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timeval = NULL;
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} else if (first_round) {
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glong add = timeout / 1000;
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else if (timeout != GST_CLOCK_TIME_NONE) {
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if (first_round) {
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g_get_current_time (&then);
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first_round = FALSE;
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} else {
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GstClockTime elapsed;
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if (add == 0)
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/* no need to wait */
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break;
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g_get_current_time (&now);
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/* make timeout absolute */
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g_get_current_time (&abstimeout);
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g_time_val_add (&abstimeout, add);
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timeval = &abstimeout;
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first_round = FALSE;
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GST_DEBUG_OBJECT (bus, "blocking for message, timeout %ld", add);
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} else {
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/* calculated the absolute end time already, no need to do it again */
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GST_DEBUG_OBJECT (bus, "blocking for message, again");
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timeval = &abstimeout; /* fool compiler */
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elapsed = GST_TIMEVAL_TO_TIME (now) - GST_TIMEVAL_TO_TIME (then);
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if (timeout > elapsed)
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timeout -= elapsed;
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else
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timeout = 0;
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}
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}
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if (!g_cond_timed_wait (bus->priv->queue_cond, bus->queue_lock, timeval)) {
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g_mutex_unlock (bus->queue_lock);
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ret = gst_poll_wait (bus->priv->poll, timeout);
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g_mutex_lock (bus->queue_lock);
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if (ret == 0) {
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GST_INFO_OBJECT (bus, "timed out, breaking loop");
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break;
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} else {
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@ -644,7 +604,7 @@ gst_bus_peek (GstBus * bus)
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g_return_val_if_fail (GST_IS_BUS (bus), NULL);
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g_mutex_lock (bus->queue_lock);
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message = g_queue_peek_head (bus->queue);
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message = gst_atomic_queue_peek (bus->queue);
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if (message)
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gst_message_ref (message);
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g_mutex_unlock (bus->queue_lock);
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@ -702,24 +662,13 @@ typedef struct
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{
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GSource source;
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GstBus *bus;
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gboolean inited;
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} GstBusSource;
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static gboolean
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gst_bus_source_prepare (GSource * source, gint * timeout)
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{
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GstBusSource *bsrc = (GstBusSource *) source;
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/* we do this here now that we know that we're attached to a main context
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* (we don't support detaching a source from a main context and then
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* re-attaching it to a different main context) */
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if (G_UNLIKELY (!bsrc->inited)) {
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gst_bus_set_main_context (bsrc->bus, g_source_get_context (source));
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bsrc->inited = TRUE;
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}
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*timeout = -1;
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return gst_bus_have_pending (bsrc->bus);
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return FALSE;
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}
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static gboolean
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@ -727,7 +676,7 @@ gst_bus_source_check (GSource * source)
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{
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GstBusSource *bsrc = (GstBusSource *) source;
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return gst_bus_have_pending (bsrc->bus);
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return bsrc->bus->priv->pollfd.revents & (G_IO_IN | G_IO_HUP | G_IO_ERR);
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}
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static gboolean
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@ -789,7 +738,6 @@ gst_bus_source_finalize (GSource * source)
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bus->priv->watch_id = NULL;
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GST_OBJECT_UNLOCK (bus);
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gst_bus_set_main_context (bsource->bus, NULL);
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gst_object_unref (bsource->bus);
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bsource->bus = NULL;
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}
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@ -821,7 +769,7 @@ gst_bus_create_watch (GstBus * bus)
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source = (GstBusSource *) g_source_new (&gst_bus_source_funcs,
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sizeof (GstBusSource));
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source->bus = gst_object_ref (bus);
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source->inited = FALSE;
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g_source_add_poll ((GSource *) source, &bus->priv->pollfd);
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return (GSource *) source;
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}
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@ -28,6 +28,7 @@ typedef struct _GstBusClass GstBusClass;
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#include <gst/gstmessage.h>
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#include <gst/gstclock.h>
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#include <gst/gstatomicqueue.h>
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G_BEGIN_DECLS
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@ -115,7 +116,7 @@ struct _GstBus
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GstObject object;
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/*< private >*/
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GQueue *queue;
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GstAtomicQueue *queue;
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GMutex *queue_lock;
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GstBusSyncHandler sync_handler;
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