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diff --git a/src/engine/PostProcessor.h b/src/engine/PostProcessor.h
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+/* 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
+ */
+
+#ifndef POSTPROCESSOR_H
+#define POSTPROCESSOR_H
+
+#include <pthread.h>
+#include "util/types.h"
+#include "util/Queue.h"
+#include "util/Semaphore.h"
+
+namespace Om {
+
+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:
+	PostProcessor(size_t queue_size);
+	~PostProcessor();
+
+	void start();
+	void stop();
+
+	inline void push(Event* const ev);
+	void        signal();
+
+private:
+	// Prevent copies
+	PostProcessor(const PostProcessor&);
+	PostProcessor& operator=(const PostProcessor&);
+
+	Queue<Event*> m_events;
+
+	static void* process_events(void* me);
+	void*        m_process_events();
+
+	pthread_t   m_process_thread;
+	bool        m_thread_exists;
+	static bool m_process_thread_exit_flag;
+	Semaphore   m_semaphore;
+};
+
+
+/** Push an event on to the process queue, realtime-safe, not thread-safe.
+ */
+inline void
+PostProcessor::push(Event* const ev)
+{
+	m_events.push(ev);
+}
+
+
+} // namespace Om
+
+#endif // POSTPROCESSOR_H