X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fsession_process.cc;h=7788eb2b978fd260aa16bc0a5dd6d8e4480d0eba;hb=379ad3357df6cba267b7005aac572d6821487269;hp=be3f4f968b9c10a387d823ff7004455a2f421ca5;hpb=a2897ecef6da6a458aa1de8c2d9973a1e809dca2;p=ardour.git

diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index be3f4f968b..7788eb2b97 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -25,29 +25,25 @@
 #include "pbd/error.h"
 #include "pbd/enumwriter.h"
 
-#include <glibmm/thread.h>
+#include <glibmm/threads.h>
 
-#include "ardour/ardour.h"
 #include "ardour/audioengine.h"
 #include "ardour/auditioner.h"
 #include "ardour/butler.h"
+#include "ardour/cycle_timer.h"
 #include "ardour/debug.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/timestamps.h"
-#include "ardour/graph.h"
-#include "ardour/audio_port.h"
-#include "ardour/tempo.h"
 #include "ardour/ticker.h"
-#include "ardour/cycle_timer.h"
+#include "ardour/types.h"
 
-#include "midi++/manager.h"
 #include "midi++/mmc.h"
 
-#include "i18n.h"
-
-#include <xmmintrin.h>
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace PBD;
@@ -62,8 +58,6 @@ Session::process (pframes_t nframes)
 {
 	framepos_t transport_at_start = _transport_frame;
 
-	MIDI::Manager::instance()->cycle_start(nframes);
-
 	_silent = false;
 
 	if (processing_blocked()) {
@@ -81,6 +75,29 @@ 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
@@ -90,16 +107,17 @@ Session::process (pframes_t nframes)
 	 */
 
 	try {
-		if (!_engine.freewheeling() && Config->get_send_midi_clock() && transport_speed() == 1.0f && midi_clock->has_midi_port()) {
-			midi_clock->tick (transport_at_start);
+		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 */
 	}
 
 	SendFeedback (); /* EMIT SIGNAL */
-
-	MIDI::Manager::instance()->cycle_end();
 }
 
 int
@@ -112,16 +130,18 @@ 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;
-	bool 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) {
 		_click_io->silence (nframes);
 	}
 
+	ltc_tx_send_time_code_for_cycle (_transport_frame, end_frame, _target_transport_speed, _transport_speed, 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);
@@ -129,7 +149,7 @@ Session::no_roll (pframes_t nframes)
 		PT_TIMING_CHECK (10);
 		for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 
-			if ((*i)->is_hidden()) {
+			if ((*i)->is_auditioner()) {
 				continue;
 			}
 
@@ -154,27 +174,25 @@ 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);
 
 	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) {
 
 			int ret;
 
-			if ((*i)->is_hidden()) {
+			if ((*i)->is_auditioner()) {
 				continue;
 			}
 
@@ -214,7 +232,7 @@ Session::silent_process_routes (pframes_t nframes, bool& need_butler)
 
 			int ret;
 
-			if ((*i)->is_hidden()) {
+			if ((*i)->is_auditioner()) {
 				continue;
 			}
 
@@ -266,7 +284,7 @@ void
 Session::process_with_events (pframes_t nframes)
 {
 	PT_TIMING_CHECK (3);
-	
+
 	SessionEvent*  ev;
 	pframes_t      this_nframes;
 	framepos_t     end_frame;
@@ -296,6 +314,47 @@ 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;
@@ -331,7 +390,7 @@ Session::process_with_events (pframes_t nframes)
 	 * and prepare for rolling)
 	 */
 	if (_send_timecode_update) {
-		send_full_time_code (_transport_frame);
+		send_full_time_code (_transport_frame, nframes);
 	}
 
 	if (!process_can_proceed()) {
@@ -340,15 +399,22 @@ 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;
 	} else {
-		interpolation.set_target_speed (fabs(_target_transport_speed));
-		interpolation.set_speed (fabs(_transport_speed));
+		interpolation.set_target_speed (_target_transport_speed);
+		interpolation.set_speed (_transport_speed);
 		frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
 	}
 
@@ -378,6 +444,8 @@ 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)) {
@@ -405,6 +473,8 @@ 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);
@@ -428,7 +498,9 @@ Session::process_with_events (pframes_t nframes)
 				check_declick_out ();
 			}
 
-			_engine.split_cycle (this_nframes);
+			if (nframes > 0) {
+				_engine.split_cycle (this_nframes);
+			}
 
 			/* now handle this event and all others scheduled for the same time */
 
@@ -519,7 +591,9 @@ Session::follow_slave (pframes_t nframes)
 		slave_speed = 0.0f;
 	}
 
-	if (_slave->is_always_synced() || config.get_timecode_source_is_synced()) {
+	if (_slave->is_always_synced() ||
+			(Config->get_timecode_source_is_synced() && (dynamic_cast<TimecodeSlave*>(_slave)) != 0)
+			) {
 
 		/* if the TC source is synced, then we assume that its
 		   speed is binary: 0.0 or 1.0
@@ -547,7 +621,9 @@ 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()) {
+	if (_slave_state == Running && !_slave->is_always_synced() &&
+			!(Config->get_timecode_source_is_synced() && (dynamic_cast<TimecodeSlave*>(_slave)) != 0)
+			) {
 
 		if (_transport_speed != 0.0f) {
 
@@ -578,7 +654,7 @@ 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)));
@@ -589,7 +665,7 @@ Session::follow_slave (pframes_t nframes)
 			}
 
 #if 1
-			if ((framecnt_t) abs(average_slave_delta) > _slave->resolution()) {
+			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;
 			}
@@ -598,7 +674,7 @@ Session::follow_slave (pframes_t nframes)
 	}
 
 
-	if (_slave_state == Running && !non_realtime_work_pending()) {
+	if (_slave_state == Running && 0 == (post_transport_work () & ~PostTransportSpeed)) {
 		/* speed is set, we're locked, and good to go */
 		return true;
 	}
@@ -659,7 +735,10 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
 
 			} else {
 
-				_slave_state = Running;
+				DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped -> running at %1\n", slave_transport_frame));
+
+				memset (delta_accumulator, 0, sizeof (int32_t) * delta_accumulator_size);
+				average_slave_delta = 0L;
 
 				Location* al = _locations->auto_loop_location();
 
@@ -669,8 +748,10 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
 				}
 
 				if (slave_transport_frame != _transport_frame) {
+					DEBUG_TRACE (DEBUG::Slave, string_compose ("require locate to run. eng: %1 -> sl: %2\n", _transport_frame, slave_transport_frame));
 					locate (slave_transport_frame, false, false);
 				}
+				_slave_state = Running;
 			}
 			break;
 
@@ -719,9 +800,6 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
 					cerr << "cannot micro-seek\n";
 					/* XXX what? */
 				}
-
-				memset (delta_accumulator, 0, sizeof (int32_t) * delta_accumulator_size);
-				average_slave_delta = 0L;
 			}
 		}
 
@@ -744,7 +822,7 @@ Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame,
 			force_locate (slave_transport_frame, false);
 		}
 
-		_slave_state = Stopped;
+		reset_slave_state();
 	}
 }
 
@@ -757,7 +835,7 @@ Session::follow_slave_silently (pframes_t nframes, float slave_speed)
 		   for now.
 		*/
 
-		bool need_butler;
+		bool need_butler = false;
 
 		silent_process_routes (nframes, need_butler);
 
@@ -793,6 +871,7 @@ Session::process_without_events (pframes_t nframes)
 
 	if (!_exporting && _slave) {
 		if (!follow_slave (nframes)) {
+			ltc_tx_send_time_code_for_cycle (_transport_frame, _transport_frame, 0, 0 , nframes);
 			return;
 		}
 	}
@@ -805,8 +884,8 @@ Session::process_without_events (pframes_t nframes)
 	if (_transport_speed == 1.0) {
 		frames_moved = (framecnt_t) nframes;
 	} else {
-		interpolation.set_target_speed (fabs(_target_transport_speed));
-		interpolation.set_speed (fabs(_transport_speed));
+		interpolation.set_target_speed (_target_transport_speed);
+		interpolation.set_speed (_transport_speed);
 		frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
 	}
 
@@ -814,6 +893,8 @@ Session::process_without_events (pframes_t nframes)
 		send_midi_time_code_for_cycle (_transport_frame, _transport_frame + frames_moved, nframes);
 	}
 
+	ltc_tx_send_time_code_for_cycle (_transport_frame, _transport_frame + frames_moved, _target_transport_speed, _transport_speed, nframes);
+
 	framepos_t const stop_limit = compute_stop_limit ();
 
 	if (maybe_stop (stop_limit)) {
@@ -834,16 +915,6 @@ Session::process_without_events (pframes_t nframes)
 
 	get_track_statistics ();
 
-	/* XXX: I'm not sure whether this is correct, but at least it
-	   matches process_with_events, so that this new frames_moved
-	   is -ve when transport speed is -ve.  This means that the
-	   transport position is updated correctly when we are in
-	   reverse.  It seems a bit wrong that we're not using the
-	   interpolator to compute this.
-	*/
-
-	frames_moved = (framecnt_t) floor (_transport_speed * nframes);
-
 	if (frames_moved < 0) {
 		decrement_transport_position (-frames_moved);
 	} else {
@@ -868,7 +939,7 @@ Session::process_audition (pframes_t nframes)
 	boost::shared_ptr<RouteList> r = routes.reader ();
 
 	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-		if (!(*i)->is_hidden()) {
+		if (!(*i)->is_auditioner()) {
 			(*i)->silence (nframes);
 		}
 	}
@@ -881,8 +952,8 @@ Session::process_audition (pframes_t nframes)
 
 	/* if using a monitor section, run it because otherwise we don't hear anything */
 
-	if (auditioner->needs_monitor()) {
-		_monitor_out->passthru (_transport_frame, _transport_frame + nframes, nframes, false);
+	if (_monitor_out && auditioner->needs_monitor()) {
+		_monitor_out->monitor_run (_transport_frame, _transport_frame + nframes, nframes, false);
 	}
 
 	/* handle pending events */
@@ -1016,23 +1087,37 @@ 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:
 		if (play_loop) {
+			/* roll after locate, do not flush, set "with loop"
+			   true only if we are seamless looping
+			*/
 			start_locate (ev->target_frame, true, false, Config->get_seamless_loop());
 		}
 		remove = false;
 		del = false;
 		break;
 
+	case SessionEvent::AutoLoopDeclick:
+		if (play_loop) {
+			/* Request a declick fade-out and a fade-in; the fade-out will happen
+			   at the end of the loop, and the fade-in at the start.
+			*/
+			transport_sub_state |= (PendingLoopDeclickOut | PendingLoopDeclickIn);
+		}
+		remove = false;
+		del = false;
+		break;
+
 	case SessionEvent::Locate:
 		if (ev->yes_or_no) {
-			// cerr << "forced locate to " << ev->target_frame << endl;
+			/* args: do not roll after locate, do flush, not with loop */
 			locate (ev->target_frame, false, true, false);
 		} else {
-			// cerr << "soft locate to " << ev->target_frame << endl;
+			/* args: do not roll after locate, do flush, not with loop */
 			start_locate (ev->target_frame, false, true, false);
 		}
 		_send_timecode_update = true;
@@ -1040,15 +1125,24 @@ Session::process_event (SessionEvent* ev)
 
 	case SessionEvent::LocateRoll:
 		if (ev->yes_or_no) {
-			// cerr << "forced locate to+roll " << ev->target_frame << endl;
+			/* args: roll after locate, do flush, not with loop */
 			locate (ev->target_frame, true, true, false);
 		} else {
-			// cerr << "soft locate to+roll " << ev->target_frame << endl;
+			/* args: roll after locate, do flush, not with loop */
 			start_locate (ev->target_frame, true, true, false);
 		}
 		_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;
@@ -1057,12 +1151,12 @@ Session::process_event (SessionEvent* ev)
 
 
 	case SessionEvent::SetTransportSpeed:
-		set_transport_speed (ev->speed, ev->yes_or_no, ev->second_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;
@@ -1071,17 +1165,25 @@ 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;
@@ -1096,6 +1198,7 @@ Session::process_event (SessionEvent* ev)
 		break;
 
 	case SessionEvent::RangeLocate:
+		/* args: roll after locate, do flush, not with loop */
 		start_locate (ev->target_frame, true, true, false);
 		remove = false;
 		del = false;
@@ -1110,6 +1213,7 @@ Session::process_event (SessionEvent* ev)
 		break;
 
 	case SessionEvent::SetSyncSource:
+		DEBUG_TRACE (DEBUG::Slave, "seen request for new slave\n");
 		use_sync_source (ev->slave);
 		break;
 
@@ -1128,6 +1232,10 @@ Session::process_event (SessionEvent* ev)
 		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
@@ -1147,7 +1255,7 @@ 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;
 	};
 
@@ -1166,7 +1274,15 @@ Session::compute_stop_limit () const
 	if (!Config->get_stop_at_session_end ()) {
 		return max_framepos;
 	}
-	
+
+	if (_slave) {
+		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());
 
@@ -1183,3 +1299,79 @@ 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);
+}