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diff --git a/src/server/ThreadManager.hpp b/src/server/ThreadManager.hpp
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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_ENGINE_THREADMANAGER_HPP
+#define INGEN_ENGINE_THREADMANAGER_HPP
+
+#include <cassert>
+#include "raul/Thread.hpp"
+
+namespace Ingen {
+namespace Server {
+
+enum ThreadID {
+	THREAD_PRE_PROCESS,
+	THREAD_PROCESS,
+	THREAD_MESSAGE,
+};
+
+class ThreadManager {
+public:
+	inline static bool thread_is(ThreadID id) {
+		return Raul::Thread::get().is_context(id);
+	}
+
+	inline static void assert_thread(ThreadID id) {
+		assert(single_threaded || Raul::Thread::get().is_context(id));
+	}
+
+	inline static void assert_not_thread(ThreadID id) {
+		assert(single_threaded || !Raul::Thread::get().is_context(id));
+	}
+
+	/** Set to true during initialisation so ensure_thread doesn't fail.
+	 * Defined in Engine.cpp
+	 */
+	static bool single_threaded;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_THREADMANAGER_HPP