don't ping JACK server 4 times to see if it is already up when ardour starts

libs/backends/jack/jack_api.cc

@@ -63,7 +63,7 @@ deinstantiate ()
 static bool
 already_configured ()
 {
-	return JackConnection::server_running ();
+	return !JackConnection::in_control ();
 }
 
 static ARDOUR::AudioBackendInfo _descriptor = {

libs/backends/jack/jack_audiobackend.cc

@@ -513,7 +513,10 @@ JACKAudioBackend::start ()
 {
 	if (!available()) {
 
-		if (!_jack_connection->server_running()) {
+		if (_jack_connection->in_control()) {
+			/* we will be starting JACK, so set up the 
+			   command that JACK will use when it (auto-)starts
+			*/
 			setup_jack_startup_command ();
 		}
 

libs/backends/jack/jack_connection.cc

@@ -36,6 +36,8 @@ using std::vector;
 using std::cerr;
 using std::endl;
 
+bool JackConnection::_in_control = false;
+
 static void jack_halted_callback (void* arg)
 {
 	JackConnection* jc = static_cast<JackConnection*> (arg);
@@ -54,17 +56,9 @@ JackConnection::JackConnection (const std::string& arg1, const std::string& arg2
 	, _client_name (arg1)
 	, session_uuid (arg2)
 {
-	_in_control = !server_running();
-}
+	/* See if the server is already up 
+	 */
 
-JackConnection::~JackConnection ()
-{
-	close ();
-}
-
-bool
-JackConnection::server_running ()
-{
         EnvironmentalProtectionAgency* global_epa = EnvironmentalProtectionAgency::get_global_epa ();
         boost::scoped_ptr<EnvironmentalProtectionAgency> current_epa;
 
@@ -83,10 +77,15 @@ JackConnection::server_running ()
 
 	if (status == 0) {
 		jack_client_close (c);
-		return true;
+		_in_control = false;
+	} else {
+		_in_control = true;
 	}
+}
 
-	return false;
+JackConnection::~JackConnection ()
+{
+	close ();
 }
 
 int
@@ -106,19 +105,6 @@ JackConnection::open ()
                 global_epa->restore ();
         }
 
-	/* check to see if the server is already running so that we know if we
-	 * are starting it.
-	 */
-
-	jack_client_t* c = jack_client_open ("ardourprobe", JackNoStartServer, &status);
-
-	if (status == 0) {
-		_in_control = false;
-		jack_client_close (c);
-	} else {
-		_in_control = true;
-	}
-
 	/* ensure that PATH or equivalent includes likely locations of the JACK
 	 * server, in case the user's default does not.
 	 */

libs/backends/jack/jack_connection.h

@@ -27,15 +27,13 @@ class JackConnection {
     void halted_callback ();
     void halted_info_callback (jack_status_t, const char*);
 
-    bool in_control() const { return _in_control; }
-
-    static bool server_running();
+    static bool in_control() { return _in_control; }
 
   private:
     jack_client_t* volatile _jack;
     std::string _client_name;
     std::string session_uuid;
-    bool _in_control;
+    static bool _in_control;
 };
 
 } // namespace