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diff --git a/src/libs/engine/ProcessSlave.hpp b/src/libs/engine/ProcessSlave.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 PROCESS_SLAVE_HPP
+#define PROCESS_SLAVE_HPP
+
+#include CONFIG_H_PATH
+
+#include <sstream>
+#include <raul/Slave.hpp>
+#include <raul/Array.hpp>
+#include <raul/AtomicInt.hpp>
+#include "types.hpp"
+
+namespace Ingen {
+
+class Node;
+class CompiledPatch;
+
+
+class ProcessSlave : protected Raul::Slave {
+public:
+	ProcessSlave(bool realtime)
+			: _id(_next_id++), _state(STATE_FINISHED), _index(0), _compiled_patch(NULL)
+	{
+		std::stringstream ss;
+		ss << "Process Slave ";
+		ss << _id;
+		set_name(ss.str());
+		
+		start();
+		
+		if (realtime)
+			set_scheduling(SCHED_FIFO, 40);
+	}
+	
+	~ProcessSlave() {
+		stop();
+	}
+
+	inline void whip(CompiledPatch* compiled_patch, size_t start_index,
+			SampleCount nframes, FrameTime start, FrameTime end) {
+		assert(_state == STATE_FINISHED);
+		_nframes = nframes;
+		_start = start;
+		_end = end;
+		_index = start_index;
+		_compiled_patch = compiled_patch;
+		_state = STATE_RUNNING;
+		Raul::Slave::whip();
+	}
+
+	inline void finish() {
+		while (_state.get() != STATE_FINISHED)
+			_state.compare_and_exchange(STATE_RUNNING, STATE_FINISH_SIGNALLED);
+	}
+
+	size_t id() const { return _id; }
+	
+private:
+
+	void _whipped();
+
+	static size_t _next_id;
+
+	static const int STATE_RUNNING = 0;
+	static const int STATE_FINISH_SIGNALLED = 1;
+	static const int STATE_FINISHED = 2;
+
+	size_t           _id;
+	Raul::AtomicInt  _state;
+	SampleCount      _nframes;
+	FrameTime        _start;
+	FrameTime        _end;
+	size_t           _index;
+	CompiledPatch*   _compiled_patch;
+};
+
+
+} // namespace Ingen
+
+#endif // PROCESS_SLAVE_HPP
+