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diff --git a/src/server/Work.hpp b/src/server/Work.hpp
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+++ b/src/server/Work.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2017 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_WORK_HPP
+#define INGEN_ENGINE_WORK_HPP
+
+#include <vector>
+
+namespace Ingen {
+namespace Server {
+
+template<typename Unit>
+class Work {
+public:
+	enum class Mode {
+		UNIT,        ///< Single unit to run
+		SEQUENTIAL,  ///< Elements must be run sequentially in order
+		PARALLEL     ///< Elements may be run in any order in parallel
+	};
+
+	static Work unit(Unit& unit) { return Work(Mode::UNIT, &unit); }
+	static Work sequential()     { return Work(Mode::SEQUENTIAL); }
+	static Work parallel()       { return Work(Mode::PARALLEL); }
+
+	void prepend(Work&& work) { _children.emplace_back(std::move(work)); }
+
+	Unit*                    unit()     const { return _unit; }
+	Mode                     mode()     const { return _mode; }
+	const std::vector<Work>& children() const { return _children; }
+
+private:
+	Work(Mode mode, Unit* unit = nullptr) : _unit(unit), _mode(mode) {}
+
+	std::vector<Work> _children; ///< Children in reverse execution order
+	Unit* const       _unit;     ///< Used for UNIT mode only
+	const Mode        _mode;     ///< Execution mode
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_WORK_HPP