Notify user when JACK disconnects us.

Timeline/Engine/Engine.C

@@ -33,6 +33,7 @@
 Engine::Engine ( ) : _thread( "RT" )
 {
     _freewheeling = false;
+    _zombified = false;
     _client = NULL;
     _buffers_dropped = 0;
     _xruns = 0;
@@ -254,6 +255,19 @@ Engine::thread_init ( void )
     _thread.set( "RT" );
 }
 
+
+void
+Engine::shutdown ( void *arg )
+{
+    ((Engine*)arg)->shutdown();
+}
+
+void
+Engine::shutdown ( void )
+{
+    _zombified = true;
+}
+
 int
 Engine::init ( void )
 {
@@ -274,6 +288,8 @@ Engine::init ( void )
 
     jack_set_timebase_callback( _client, 0, &Engine::timebase, this );
 
+    jack_on_shutdown( _client, &Engine::shutdown, this );
+
     jack_activate( _client );
 
     _sample_rate = frame_rate();

Timeline/Engine/Engine.H

@@ -49,7 +49,11 @@ class Engine : public Mutex
     nframes_t _sample_rate;
     volatile int _xruns;
     volatile bool _freewheeling;
+    volatile bool _zombified;
 
+
+    static void shutdown ( void *arg );
+    void shutdown ( void );
     static int process ( nframes_t nframes, void *arg );
     int process ( nframes_t nframes );
     static int sync ( jack_transport_state_t state, jack_position_t *pos, void *arg );
@@ -90,6 +94,7 @@ public:
     int dropped ( void ) const { return _buffers_dropped; }
     bool freewheeling ( void ) const { return _freewheeling; }
     void freewheeling ( bool yes );
+    bool zombified ( void ) const { return _zombified; }
 
     float cpu_load ( void ) const { return jack_cpu_load( _client ); }
 };

Timeline/TLE.fl

@@ -161,9 +161,9 @@ Loggable::progress_callback( &TLE::progress_cb, this );} {}
   } {
     Fl_Window main_window {
       label Timeline open
-      xywh {177 137 1025 770} type Double resizable xclass Non_DAW visible
+      xywh {894 189 1025 770} type Double resizable xclass Non_DAW visible
     } {
-      Fl_Menu_Bar menubar {open
+      Fl_Menu_Bar menubar {
         xywh {0 0 1024 25}
       } {
         Submenu {} {
@@ -696,7 +696,16 @@ if ( timeline->total_playback_xruns() )
 
 
 
-xruns_output->value( engine->xruns() );} {}
+xruns_output->value( engine->xruns() );
+
+static bool zombie = false;
+
+if ( engine->zombified() && ! zombie )
+{
+	zombie = true;
+	fl_alert( "Disconnected from JACK!" );
+}} {selected
+    }
   }
   Function {update_cb( void *v )} {return_type {static void}
   } {
@@ -825,8 +834,7 @@ update_progress( progress, pat, p );
 
 progress->redraw();
 
-Fl::check();} {selected
-    }
+Fl::check();} {}
   }
 }