More juggling

git-svn-id: http://svn.drobilla.net/lad/grauph@16 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 81 insertions, 0 deletions

diff --git a/src/progs/gtk/GtkClientInterface.cpp b/src/progs/gtk/GtkClientInterface.cpp
new file mode 100644
index 00000000..7bda1e9e
--- /dev/null
+++ b/src/progs/gtk/GtkClientInterface.cpp
@@ -0,0 +1,81 @@
+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Om is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "GtkClientInterface.h"
+#include <cstdio>
+#include <string>
+#include <sys/time.h>
+#include <time.h>
+#include <gtkmm.h>
+#include "ControlInterface.h"
+
+namespace OmGtk {
+
+
+GtkClientInterface::GtkClientInterface(ControlInterface* interface, int client_port)
+: OSCListener(client_port)
+, ModelClientInterface()
+, _interface(interface)
+, _num_plugins(0)
+, _events(4096)
+{
+}
+
+
+/** Push an event (from the engine, ie 'new patch') on to the queue.
+ */
+void
+GtkClientInterface::push_event(Closure ev)
+{
+	bool success = false;
+	bool first   = true;
+	
+	// (Very) slow busy-wait if the queue is full
+	// FIXME: Make this wait on a signal from process_events iff this happens
+	while (!success) {
+		success = _events.push(ev);
+		if (!success) {
+			if (first) {
+				cerr << "[GtkClientInterface] WARNING:  (Client) event queue full.  Waiting to try again..." << endl;
+				first = false;
+			}
+			usleep(200000); // 100 milliseconds (2* rate process_events is called)
+		}
+	}
+}
+
+
+/** Process all queued events that came from the OSC thread.
+ *
+ * This function is to be called from the Gtk thread only.
+ */
+bool
+GtkClientInterface::process_events()
+{
+	// Process a maximum of queue-size events, to prevent locking the GTK
+	// thread indefinitely while processing continually arriving events
+	size_t num_processed = 0;
+	while (!_events.is_empty() && num_processed++ < _events.capacity()/2) {
+		Closure& ev = _events.pop();
+		ev();
+		ev.disconnect();
+	}
+
+	return true;
+}
+
+
+} // namespace OmGtk