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diff --git a/src/common/util/Slave.h b/src/common/util/Slave.h
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+/* This file is part of Ingen.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * 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 SLAVE_H
+#define SLAVE_H
+
+#include <pthread.h>
+#include "util/Semaphore.h"
+#include "util/Thread.h"
+
+
+/** Thread driven by (realtime safe) signals.
+ *
+ * \ingroup engine
+ */
+class Slave : public Thread
+{
+public:
+	Slave() : _whip(0) {}
+
+	/** Tell the slave to do whatever work it does.  Realtime safe. */
+	inline void whip() { _whip.post(); }
+
+protected:
+	virtual void _whipped() = 0;
+
+	Semaphore _whip;
+
+private:
+	// Prevent copies (undefined)
+	Slave(const Slave&);
+	Slave& operator=(const Slave&);
+
+	inline void _run()
+	{
+		while (true) {
+			_whip.wait();
+			_whipped();
+		}
+	}
+};
+
+
+#endif // SLAVE_H