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diff --git a/src/libs/engine/PostProcessor.hpp b/src/libs/engine/PostProcessor.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 POSTPROCESSOR_H
+#define POSTPROCESSOR_H
+
+#include <pthread.h>
+#include "types.hpp"
+#include <raul/SRSWQueue.hpp>
+#include <raul/Slave.hpp>
+
+namespace Raul { class Maid; }
+
+namespace Ingen {
+
+class Event;
+
+
+/** Processor for Events after leaving the audio thread.
+ *
+ * The audio thread pushes events to this when it is done with them (which
+ * is realtime-safe), which signals the processing thread through a semaphore
+ * to handle the event and pass it on to the Maid.
+ *
+ * \ingroup engine
+ */
+class PostProcessor : public Raul::Slave
+{
+public:
+	PostProcessor(Raul::Maid& maid, size_t queue_size);
+
+	/** Push an event on to the process queue, realtime-safe, not thread-safe. */
+	inline void push(Event* const ev) { _events.push(ev); }
+
+private:
+	Raul::Maid&             _maid;
+	Raul::SRSWQueue<Event*> _events;
+	virtual void            _whipped();
+};
+
+
+} // namespace Ingen
+
+#endif // POSTPROCESSOR_H