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diff --git a/raul/Command.hpp b/raul/Command.hpp
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+/* This file is part of Raul.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Raul 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.
+ * 
+ * Raul 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 RAUL_COMMAND_HPP
+#define RAUL_COMMAND_HPP
+
+#include <raul/Semaphore.hpp>
+#include <boost/utility.hpp>
+
+namespace Raul {
+
+
+/** A blocking command to be executed in the audio thread.
+ *
+ * This is useful for calling simple parameterless commands from another thread
+ * (OSC, GUI, etc) and waiting on the result.  Works well for coarsely timed
+ * events.  Realtime safe on the commend executing side.
+ *
+ * \ingroup raul
+ */
+class Command : boost::noncopyable {
+public:
+
+	inline Command() : _sem(0) {}
+
+	/** Caller context */
+	inline void operator()() { _sem.wait(); }
+
+	/** Execution context */
+	inline bool pending() { return _sem.has_waiter(); }
+	inline void finish() { _sem.post(); }
+
+private:
+	Semaphore _sem;
+};
+
+
+} // namespace Raul
+
+#endif // RAUL_COMMAND_HPP