X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fsession_process.cc;h=fa5d16632da170cf574c04fc2ab5f03971c49f9e;hb=2a192dbbd674b859d448e0c903359dde6e9713a4;hp=6d8c0f9f70323ddd56f92fcc2a41a92e83b8b368;hpb=6fc1f270137a06115a79c6089004174c5cab5ed7;p=ardour.git

diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index 6d8c0f9f70..fa5d16632d 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -32,17 +32,21 @@
 #include "ardour/butler.h"
 #include "ardour/cycle_timer.h"
 #include "ardour/debug.h"
+#include "ardour/disk_reader.h"
 #include "ardour/graph.h"
 #include "ardour/port.h"
 #include "ardour/process_thread.h"
+#include "ardour/scene_changer.h"
 #include "ardour/session.h"
 #include "ardour/slave.h"
 #include "ardour/ticker.h"
 #include "ardour/types.h"
+#include "ardour/vca.h"
+#include "ardour/vca_manager.h"
 
 #include "midi++/mmc.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace PBD;
@@ -74,6 +78,29 @@ Session::process (pframes_t nframes)
 
 	(this->*process_function) (nframes);
 
+	/* realtime-safe meter-position and processor-order changes
+	 *
+	 * ideally this would be done in
+	 * Route::process_output_buffers() but various functions
+	 * callig it hold a _processor_lock reader-lock
+	 */
+	boost::shared_ptr<RouteList> r = routes.reader ();
+	for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
+		if ((*i)->apply_processor_changes_rt()) {
+			_rt_emit_pending = true;
+		}
+	}
+	if (_rt_emit_pending) {
+		if (!_rt_thread_active) {
+			emit_route_signals ();
+		}
+		if (pthread_mutex_trylock (&_rt_emit_mutex) == 0) {
+			pthread_cond_signal (&_rt_emit_cond);
+			pthread_mutex_unlock (&_rt_emit_mutex);
+			_rt_emit_pending = false;
+		}
+	}
+
 	_engine.main_thread()->drop_buffers ();
 
 	/* deliver MIDI clock. Note that we need to use the transport frame
@@ -86,6 +113,9 @@ Session::process (pframes_t nframes)
 		if (!_silent && !_engine.freewheeling() && Config->get_send_midi_clock() && (transport_speed() == 1.0f || transport_speed() == 0.0f) && midi_clock->has_midi_port()) {
 			midi_clock->tick (transport_at_start, nframes);
 		}
+
+		_scene_changer->run (transport_at_start, transport_at_start + nframes);
+
 	} catch (...) {
 		/* don't bother with a message */
 	}
@@ -103,10 +133,10 @@ int
 Session::no_roll (pframes_t nframes)
 {
 	PT_TIMING_CHECK (4);
-	
+
 	framepos_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
 	int ret = 0;
-	int declick = get_transport_declick_required();
+	int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
 	boost::shared_ptr<RouteList> r = routes.reader ();
 
 	if (_click_io) {
@@ -115,6 +145,11 @@ Session::no_roll (pframes_t nframes)
 
 	ltc_tx_send_time_code_for_cycle (_transport_frame, end_frame, _target_transport_speed, _transport_speed, nframes);
 
+	VCAList v = _vca_manager->vcas ();
+	for (VCAList::const_iterator i = v.begin(); i != v.end(); ++i) {
+		(*i)->automation_run (_transport_frame, nframes);
+	}
+
 	if (_process_graph) {
 		DEBUG_TRACE(DEBUG::ProcessThreads,"calling graph/no-roll\n");
 		_process_graph->routes_no_roll( nframes, _transport_frame, end_frame, non_realtime_work_pending(), declick);
@@ -147,20 +182,25 @@ Session::no_roll (pframes_t nframes)
 int
 Session::process_routes (pframes_t nframes, bool& need_butler)
 {
-	int  declick = get_transport_declick_required();
+	int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
 	boost::shared_ptr<RouteList> r = routes.reader ();
 
-	if (transport_sub_state & StopPendingCapture) {
-		/* force a declick out */
-		declick = -1;
-	}
-
 	const framepos_t start_frame = _transport_frame;
 	const framepos_t end_frame = _transport_frame + floor (nframes * _transport_speed);
-	
+
+	VCAList v = _vca_manager->vcas ();
+	for (VCAList::const_iterator i = v.begin(); i != v.end(); ++i) {
+		(*i)->automation_run (start_frame, nframes);
+	}
+
+	_global_locate_pending = locate_pending ();
+
 	if (_process_graph) {
 		DEBUG_TRACE(DEBUG::ProcessThreads,"calling graph/process-routes\n");
-		_process_graph->process_routes (nframes, start_frame, end_frame, declick, need_butler);
+		if (_process_graph->process_routes (nframes, start_frame, end_frame, declick, need_butler) < 0) {
+			stop_transport ();
+			return -1;
+		}
 	} else {
 
 		for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
@@ -181,44 +221,7 @@ Session::process_routes (pframes_t nframes, bool& need_butler)
 			}
 
 			if (b) {
-				need_butler = true;
-			}
-		}
-	}
-
-	return 0;
-}
-
-/** @param need_butler to be set to true by this method if it needs the butler,
- *  otherwise it must be left alone.
- */
-int
-Session::silent_process_routes (pframes_t nframes, bool& need_butler)
-{
-	boost::shared_ptr<RouteList> r = routes.reader ();
-
-	const framepos_t start_frame = _transport_frame;
-	const framepos_t end_frame = _transport_frame + lrintf(nframes * _transport_speed);
-
-	if (_process_graph) {
-		_process_graph->silent_process_routes (nframes, start_frame, end_frame, need_butler);
-	} else {
-		for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-
-			int ret;
-
-			if ((*i)->is_auditioner()) {
-				continue;
-			}
-
-			bool b = false;
-
-			if ((ret = (*i)->silent_roll (nframes, start_frame, end_frame, b)) < 0) {
-				stop_transport ();
-				return -1;
-			}
-
-			if (b) {
+				DEBUG_TRACE (DEBUG::Butler, string_compose ("%1 rolled and needs butler\n", (*i)->name()));
 				need_butler = true;
 			}
 		}
@@ -238,7 +241,7 @@ Session::get_track_statistics ()
 
 		boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
 
-		if (!tr || tr->hidden()) {
+		if (!tr || tr->is_private_route()) {
 			continue;
 		}
 
@@ -259,7 +262,7 @@ void
 Session::process_with_events (pframes_t nframes)
 {
 	PT_TIMING_CHECK (3);
-	
+
 	SessionEvent*  ev;
 	pframes_t      this_nframes;
 	framepos_t     end_frame;
@@ -289,6 +292,47 @@ Session::process_with_events (pframes_t nframes)
 		process_event (ev);
 	}
 
+	/* count in */
+	if (_transport_speed != 1.0 && _count_in_samples > 0) {
+		_count_in_samples = 0;
+	}
+
+	if (_count_in_samples > 0) {
+		framecnt_t ns = std::min ((framecnt_t)nframes, _count_in_samples);
+
+		no_roll (ns);
+		run_click (_transport_frame - _count_in_samples, ns);
+
+		_count_in_samples -= ns;
+		nframes -= ns;
+
+		/* process events.. */
+		if (!events.empty() && next_event != events.end()) {
+			SessionEvent* this_event = *next_event;
+			Events::iterator the_next_one = next_event;
+			++the_next_one;
+
+			while (this_event && this_event->action_frame == _transport_frame) {
+				process_event (this_event);
+				if (the_next_one == events.end()) {
+					this_event = 0;
+				} else {
+					this_event = *the_next_one;
+					++the_next_one;
+				}
+			}
+			set_next_event ();
+		}
+
+		check_declick_out ();
+
+		if (nframes == 0) {
+			return;
+		} else {
+			_engine.split_cycle (ns);
+		}
+	}
+
 	/* Decide on what to do with quarter-frame MTC during this cycle */
 
 	bool const was_sending_qf_mtc = _send_qf_mtc;
@@ -333,16 +377,27 @@ Session::process_with_events (pframes_t nframes)
 	}
 
 	if (events.empty() || next_event == events.end()) {
-		process_without_events (nframes);
-		return;
+		try_run_lua (nframes); // also during export ?? ->move to process_without_events()
+		/* lua scripts may inject events */
+		while (_n_lua_scripts > 0 && pending_events.read (&ev, 1) == 1) {
+			merge_event (ev);
+		}
+		if (events.empty() || next_event == events.end()) {
+			process_without_events (nframes);
+			return;
+		}
 	}
 
-	if (_transport_speed == 1.0) {
-		frames_moved = (framecnt_t) nframes;
+	if (locate_pending()) {
+		frames_moved = 0;
 	} else {
-		interpolation.set_target_speed (_target_transport_speed);
-		interpolation.set_speed (_transport_speed);
-		frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
+		if (_transport_speed == 1.0) {
+			frames_moved = (framecnt_t) nframes;
+		} else {
+			interpolation.set_target_speed (_target_transport_speed);
+			interpolation.set_speed (_transport_speed);
+			frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
+		}
 	}
 
 	end_frame = _transport_frame + frames_moved;
@@ -371,6 +426,8 @@ Session::process_with_events (pframes_t nframes)
 			send_midi_time_code_for_cycle (_transport_frame, end_frame, nframes);
 		}
 
+		ltc_tx_send_time_code_for_cycle (_transport_frame, end_frame, _target_transport_speed, _transport_speed, nframes);
+
 		framepos_t stop_limit = compute_stop_limit ();
 
 		if (maybe_stop (stop_limit)) {
@@ -389,7 +446,11 @@ Session::process_with_events (pframes_t nframes)
 		while (nframes) {
 
 			this_nframes = nframes; /* real (jack) time relative */
-			frames_moved = (framecnt_t) floor (_transport_speed * nframes); /* transport relative */
+			if (locate_pending()) {
+				frames_moved = 0;
+			} else {
+				frames_moved = (framecnt_t) floor (_transport_speed * nframes); /* transport relative */
+			}
 
 			/* running an event, position transport precisely to its time */
 			if (this_event && this_event->action_frame <= end_frame && this_event->action_frame >= _transport_frame) {
@@ -398,6 +459,8 @@ Session::process_with_events (pframes_t nframes)
 				this_nframes = abs (floor(frames_moved / _transport_speed));
 			}
 
+			try_run_lua (this_nframes);
+
 			if (this_nframes) {
 
 				click (_transport_frame, this_nframes);
@@ -413,7 +476,7 @@ Session::process_with_events (pframes_t nframes)
 
 				if (frames_moved < 0) {
 					decrement_transport_position (-frames_moved);
-				} else {
+				} else if (frames_moved) {
 					increment_transport_position (frames_moved);
 				}
 
@@ -454,6 +517,7 @@ Session::process_with_events (pframes_t nframes)
 	} /* implicit release of route lock */
 
 	if (session_needs_butler) {
+		DEBUG_TRACE (DEBUG::Butler, "p-with-events: session needs butler, call it\n");
 		_butler->summon ();
 	}
 }
@@ -534,7 +598,7 @@ Session::follow_slave (pframes_t nframes)
 		*/
 
 		if (_slave_state == Running) {
-			calculate_moving_average_of_slave_delta(dir, this_delta);
+			calculate_moving_average_of_slave_delta(dir, abs(this_delta));
 		}
 	}
 
@@ -544,9 +608,9 @@ Session::follow_slave (pframes_t nframes)
 						   _slave_state, slave_transport_frame, slave_speed, this_delta, average_slave_delta));
 
 
-	if (_slave_state == Running && !_slave->is_always_synced() &&
-			!(Config->get_timecode_source_is_synced() && (dynamic_cast<TimecodeSlave*>(_slave)) != 0)
-			) {
+	if (_slave_state == Running && !_slave->is_always_synced() && !(Config->get_timecode_source_is_synced() && (dynamic_cast<TimecodeSlave*>(_slave)) != 0)) {
+
+		/* may need to varispeed to sync with slave */
 
 		if (_transport_speed != 0.0f) {
 
@@ -577,7 +641,7 @@ Session::follow_slave (pframes_t nframes)
 #endif
 
 			if (_slave->give_slave_full_control_over_transport_speed()) {
-				set_transport_speed (slave_speed, false, false);
+				set_transport_speed (slave_speed, 0, false, false);
 				//std::cout << "set speed = " << slave_speed << "\n";
 			} else {
 				float adjusted_speed = slave_speed + (1.5 * (delta /  float(_current_frame_rate)));
@@ -587,25 +651,34 @@ Session::follow_slave (pframes_t nframes)
 									   slave_speed));
 			}
 
-#if 1
-			if (!actively_recording() && (framecnt_t) abs(average_slave_delta) > _slave->resolution()) {
-				cerr << "average slave delta greater than slave resolution (" << _slave->resolution() << "), going to silent motion\n";
-				goto silent_motion;
+			if (!actively_recording() && (framecnt_t) average_slave_delta > _slave->resolution()) {
+				DEBUG_TRACE (DEBUG::Slave, string_compose ("average slave delta %1 greater than slave resolution %2 => silent motion\n", average_slave_delta, _slave->resolution()));
+				/* run routes as normal, but no disk output */
+				DiskReader::set_no_disk_output (true);
+				return true;
+			}
+
+			if (!have_first_delta_accumulator) {
+				DEBUG_TRACE (DEBUG::Slave, "waiting for first slave delta accumulator to be ready\n");
+				/* run routes as normal, but no disk output */
+				DiskReader::set_no_disk_output (true);
+				return true;
 			}
-#endif
 		}
 	}
 
 
-	if (_slave_state == Running && !non_realtime_work_pending()) {
+	if (!have_first_delta_accumulator) {
+		DiskReader::set_no_disk_output (true);
+	} else {
+		DiskReader::set_no_disk_output (false);
+	}
+
+	if ((_slave_state == Running) && (0 == (post_transport_work () & ~PostTransportSpeed))) {
 		/* speed is set, we're locked, and good to go */
 		return true;
 	}
 
-  silent_motion:
-	DEBUG_TRACE (DEBUG::Slave, "silent motion\n")
-	follow_slave_silently (nframes, slave_speed);
-
   noroll:
 	/* don't move at all */
 	DEBUG_TRACE (DEBUG::Slave, "no roll\n")
@@ -633,7 +706,7 @@ Session::calculate_moving_average_of_slave_delta (int dir, framecnt_t this_delta
 		average_slave_delta /= (int32_t) delta_accumulator_size;
 		if (average_slave_delta < 0L) {
 			average_dir = -1;
-			average_slave_delta = abs(average_slave_delta);
+			average_slave_delta = average_slave_delta;
 		} else {
 			average_dir = 1;
 		}
@@ -749,38 +822,6 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
 	}
 }
 
-void
-Session::follow_slave_silently (pframes_t nframes, float slave_speed)
-{
-	if (slave_speed && _transport_speed) {
-
-		/* something isn't right, but we should move with the master
-		   for now.
-		*/
-
-		bool need_butler;
-
-		silent_process_routes (nframes, need_butler);
-
-		get_track_statistics ();
-
-		if (need_butler) {
-			_butler->summon ();
-		}
-
-		int32_t frames_moved = (int32_t) floor (_transport_speed * nframes);
-
-		if (frames_moved < 0) {
-			decrement_transport_position (-frames_moved);
-		} else {
-			increment_transport_position (frames_moved);
-		}
-
-		framepos_t const stop_limit = compute_stop_limit ();
-		maybe_stop (stop_limit);
-	}
-}
-
 void
 Session::process_without_events (pframes_t nframes)
 {
@@ -800,16 +841,20 @@ Session::process_without_events (pframes_t nframes)
 	}
 
 	if (_transport_speed == 0) {
-		fail_roll (nframes);
+		no_roll (nframes);
 		return;
 	}
 
-	if (_transport_speed == 1.0) {
-		frames_moved = (framecnt_t) nframes;
+	if (locate_pending()) {
+		frames_moved = 0;
 	} else {
-		interpolation.set_target_speed (_target_transport_speed);
-		interpolation.set_speed (_transport_speed);
-		frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
+		if (_transport_speed == 1.0) {
+			frames_moved = (framecnt_t) nframes;
+		} else {
+			interpolation.set_target_speed (_target_transport_speed);
+			interpolation.set_speed (_transport_speed);
+			frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
+		}
 	}
 
 	if (!_exporting && !timecode_transmission_suspended()) {
@@ -821,7 +866,7 @@ Session::process_without_events (pframes_t nframes)
 	framepos_t const stop_limit = compute_stop_limit ();
 
 	if (maybe_stop (stop_limit)) {
-		fail_roll (nframes);
+		no_roll (nframes);
 		return;
 	}
 
@@ -840,7 +885,7 @@ Session::process_without_events (pframes_t nframes)
 
 	if (frames_moved < 0) {
 		decrement_transport_position (-frames_moved);
-	} else {
+	} else if (frames_moved) {
 		increment_transport_position (frames_moved);
 	}
 
@@ -848,6 +893,7 @@ Session::process_without_events (pframes_t nframes)
 	check_declick_out ();
 
 	if (session_needs_butler) {
+		DEBUG_TRACE (DEBUG::Butler, "p-without-events: session needs butler, call it\n");
 		_butler->summon ();
 	}
 }
@@ -870,12 +916,13 @@ Session::process_audition (pframes_t nframes)
 	/* run the auditioner, and if it says we need butler service, ask for it */
 
 	if (auditioner->play_audition (nframes) > 0) {
+		DEBUG_TRACE (DEBUG::Butler, "auditioner needs butler, call it\n");
 		_butler->summon ();
 	}
 
 	/* if using a monitor section, run it because otherwise we don't hear anything */
 
-	if (auditioner->needs_monitor()) {
+	if (_monitor_out && auditioner->needs_monitor()) {
 		_monitor_out->monitor_run (_transport_frame, _transport_frame + nframes, nframes, false);
 	}
 
@@ -956,6 +1003,7 @@ Session::queue_event (SessionEvent* ev)
 	} else if (_state_of_the_state & Loading) {
 		merge_event (ev);
 	} else {
+		Glib::Threads::Mutex::Lock lm (rb_write_lock);
 		pending_events.write (&ev, 1);
 	}
 }
@@ -1010,7 +1058,7 @@ Session::process_event (SessionEvent* ev)
 
 	switch (ev->type) {
 	case SessionEvent::SetLoop:
-		set_play_loop (ev->yes_or_no);
+		set_play_loop (ev->yes_or_no, ev->speed);
 		break;
 
 	case SessionEvent::AutoLoop:
@@ -1057,6 +1105,15 @@ Session::process_event (SessionEvent* ev)
 		_send_timecode_update = true;
 		break;
 
+	case SessionEvent::Skip:
+		if (Config->get_skip_playback()) {
+			start_locate (ev->target_frame, true, true, false);
+			_send_timecode_update = true;
+		}
+		remove = false;
+		del = false;
+		break;
+
 	case SessionEvent::LocateRollLocate:
 		// locate is handled by ::request_roll_at_and_return()
 		_requested_return_frame = ev->target_frame;
@@ -1065,12 +1122,12 @@ Session::process_event (SessionEvent* ev)
 
 
 	case SessionEvent::SetTransportSpeed:
-		set_transport_speed (ev->speed, ev->yes_or_no, ev->second_yes_or_no, ev->third_yes_or_no);
+		set_transport_speed (ev->speed, ev->target_frame, ev->yes_or_no, ev->second_yes_or_no, ev->third_yes_or_no);
 		break;
 
 	case SessionEvent::PunchIn:
 		// cerr << "PunchIN at " << transport_frame() << endl;
-		if (config.get_punch_in() && record_status() == Enabled) {
+		if (config.get_punch_in() && record_status() == Enabled && !preroll_record_punch_enabled()) {
 			enable_record ();
 		}
 		remove = false;
@@ -1079,17 +1136,25 @@ Session::process_event (SessionEvent* ev)
 
 	case SessionEvent::PunchOut:
 		// cerr << "PunchOUT at " << transport_frame() << endl;
-		if (config.get_punch_out()) {
+		if (config.get_punch_out() && !preroll_record_punch_enabled()) {
 			step_back_from_record ();
 		}
 		remove = false;
 		del = false;
 		break;
 
+	case SessionEvent::RecordStart:
+		if (preroll_record_punch_enabled() && record_status() == Enabled) {
+			enable_record ();
+		}
+		remove = false;
+		del = false;
+		break;
+
 	case SessionEvent::StopOnce:
 		if (!non_realtime_work_pending()) {
-			stop_transport (ev->yes_or_no);
 			_clear_event_type (SessionEvent::StopOnce);
+			stop_transport (ev->yes_or_no);
 		}
 		remove = false;
 		del = false;
@@ -1114,10 +1179,6 @@ Session::process_event (SessionEvent* ev)
 		overwrite_some_buffers (static_cast<Track*>(ev->ptr));
 		break;
 
-	case SessionEvent::SetTrackSpeed:
-		set_track_speed (static_cast<Track*> (ev->ptr), ev->speed);
-		break;
-
 	case SessionEvent::SetSyncSource:
 		DEBUG_TRACE (DEBUG::Slave, "seen request for new slave\n");
 		use_sync_source (ev->slave);
@@ -1129,15 +1190,14 @@ Session::process_event (SessionEvent* ev)
 		ev->region.reset ();
 		break;
 
-	case SessionEvent::InputConfigurationChange:
-		add_post_transport_work (PostTransportInputChange);
-		_butler->schedule_transport_work ();
-		break;
-
 	case SessionEvent::SetPlayAudioRange:
 		set_play_range (ev->audio_range, (ev->speed == 1.0f));
 		break;
 
+	case SessionEvent::CancelPlayAudioRange:
+		unset_play_range();
+		break;
+
 	case SessionEvent::RealTimeOperation:
 		process_rtop (ev);
 		del = false; // other side of RT request needs to clean up
@@ -1157,7 +1217,7 @@ Session::process_event (SessionEvent* ev)
 
 	default:
 	  fatal << string_compose(_("Programming error: illegal event type in process_event (%1)"), ev->type) << endmsg;
-		/*NOTREACHED*/
+		abort(); /*NOTREACHED*/
 		break;
 	};
 
@@ -1181,7 +1241,10 @@ Session::compute_stop_limit () const
 		return max_framepos;
 	}
 
-	
+	if (preroll_record_punch_enabled ()) {
+		return max_framepos;
+	}
+
 	bool const punching_in = (config.get_punch_in () && _locations->auto_punch_location());
 	bool const punching_out = (config.get_punch_out () && _locations->auto_punch_location());
 
@@ -1198,3 +1261,79 @@ Session::compute_stop_limit () const
 
 	return current_end_frame ();
 }
+
+
+
+/* dedicated thread for signal emission.
+ *
+ * while sending cross-thread signals from the process thread
+ * is fine in general, PBD::Signal's use of boost::function and
+ * boost:bind can produce a vast overhead which is not
+ * acceptable for low latency.
+ *
+ * This works around the issue by moving the boost overhead
+ * out of the RT thread. The overall load is probably higher but
+ * the realtime thread remains unaffected.
+ */
+
+void
+Session::emit_route_signals ()
+{
+	// TODO use RAII to allow using these signals in other places
+	BatchUpdateStart(); /* EMIT SIGNAL */
+	boost::shared_ptr<RouteList> r = routes.reader ();
+	for (RouteList::const_iterator ci = r->begin(); ci != r->end(); ++ci) {
+		(*ci)->emit_pending_signals ();
+	}
+	BatchUpdateEnd(); /* EMIT SIGNAL */
+}
+
+void
+Session::emit_thread_start ()
+{
+	if (_rt_thread_active) {
+		return;
+	}
+	_rt_thread_active = true;
+
+	if (pthread_create (&_rt_emit_thread, NULL, emit_thread, this)) {
+		_rt_thread_active = false;
+	}
+}
+
+void
+Session::emit_thread_terminate ()
+{
+	if (!_rt_thread_active) {
+		return;
+	}
+	_rt_thread_active = false;
+
+	if (pthread_mutex_lock (&_rt_emit_mutex) == 0) {
+		pthread_cond_signal (&_rt_emit_cond);
+		pthread_mutex_unlock (&_rt_emit_mutex);
+	}
+
+	void *status;
+	pthread_join (_rt_emit_thread, &status);
+}
+
+void *
+Session::emit_thread (void *arg)
+{
+	Session *s = static_cast<Session *>(arg);
+	s->emit_thread_run ();
+	pthread_exit (0);
+	return 0;
+}
+
+void
+Session::emit_thread_run ()
+{
+	pthread_mutex_lock (&_rt_emit_mutex);
+	while (_rt_thread_active) {
+		emit_route_signals();
+		pthread_cond_wait (&_rt_emit_cond, &_rt_emit_mutex);
+	}
+	pthread_mutex_unlock (&_rt_emit_mutex);
+}