force execution of ARDOUR::init_post_engine() before any handlers of AudioEngine::Running()

libs/ardour/audioengine.cc

@@ -39,6 +39,7 @@
 #include "midi++/mmc.h"
 
 #include "ardour/async_midi_port.h"
+#include "ardour/ardour.h"
 #include "ardour/audio_port.h"
 #include "ardour/audio_backend.h"
 #include "ardour/audioengine.h"
@@ -930,10 +931,22 @@ AudioEngine::start (bool for_latency)
 	PortManager::fill_midi_port_info ();
 
 	if (!for_latency) {
+		/* Call the library-wide ::init_post_engine() before emitting
+		 * running to ensure that its tasks are complete before any
+		 * signal handlers execute. PBD::Signal does not ensure
+		 * ordering of signal handlers so even if ::init_post_engine()
+		 * is connected first, it may not run first.
+		 */
+
+		ARDOUR::init_post_engine (_start_cnt);
+
 		Running (_start_cnt); /* EMIT SIGNAL */
+
+		/* latency start/stop cycles do not count as "starts" */
+
+		_start_cnt++;
 	}
 
-	_start_cnt++;
 
 	return 0;
 }

libs/ardour/globals.cc

@@ -561,9 +561,6 @@ ARDOUR::init (bool use_windows_vst, bool try_optimization, const char* localedir
 
 	ARDOUR::AudioEngine::create ();
 
-	/* This will run in whatever thread calls AudioEngine::start() */
-	ARDOUR::AudioEngine::instance()->Running.connect_same_thread (engine_startup_connection, ARDOUR::init_post_engine);
-
 	/* it is unfortunate that we need to include reserved names here that
 	   refer to control surfaces. But there's no way to ensure a complete
 	   lack of collisions without doing this, since the control surface