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diff --git a/src/libs/engine/events/SendPortActivityEvent.hpp b/src/libs/engine/events/SendPortActivityEvent.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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.
+ * 
+ * Ingen 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef SENDPORTACTIVITYEVENT_H
+#define SENDPORTACTIVITYEVENT_H
+
+#include <string>
+#include "Event.hpp"
+#include "types.hpp"
+using std::string;
+
+namespace Ingen {
+
+class Port;
+
+
+/** A special event used internally to send port activity notification (e.g.
+ * MIDI event activity) from the audio thread.
+ *
+ * This is created in the audio thread (directly in a ringbuffer, not new'd)
+ * for processing in the post processing thread (unlike normal events which
+ * are created in the pre-processor thread then run through the audio
+ * thread).  This event's job is done entirely in post_process.
+ *
+ * This only really makes sense for message ports.
+ *
+ * \ingroup engine
+ */
+class SendPortActivityEvent : public Event
+{
+public:
+	inline SendPortActivityEvent(Engine&     engine,
+	                             SampleCount timestamp,
+	                             Port*       port)
+		: Event(engine, SharedPtr<Responder>(), timestamp)
+		, _port(port)
+	{
+	}
+
+	inline void operator=(const SendPortActivityEvent& ev) {
+		_port = ev._port;
+	}
+	
+	void post_process();
+
+private:
+	Port* _port;
+};
+
+
+} // namespace Ingen
+
+#endif // SENDPORTACTIVITYEVENT_H