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diff --git a/src/server/Worker.hpp b/src/server/Worker.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 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_WORKER_HPP
+#define INGEN_ENGINE_WORKER_HPP
+
+#include <thread>
+
+#include "ingen/LV2Features.hpp"
+#include "lv2/worker/worker.h"
+#include "raul/RingBuffer.hpp"
+#include "raul/Semaphore.hpp"
+
+namespace ingen {
+
+class Log;
+
+namespace server {
+
+class LV2Block;
+
+class Worker
+{
+public:
+	Worker(Log& log, uint32_t buffer_size, bool synchronous=false);
+	~Worker();
+
+	struct Schedule : public LV2Features::Feature {
+		Schedule(bool sync) : synchronous(sync) {}
+
+		const char* uri() const override { return LV2_WORKER__schedule; }
+
+		SPtr<LV2_Feature> feature(World* world, Node* n) override;
+
+		const bool synchronous;
+	};
+
+	LV2_Worker_Status request(LV2Block*   block,
+	                          uint32_t    size,
+	                          const void* data);
+
+	SPtr<Schedule> schedule_feature() { return _schedule; }
+
+private:
+	SPtr<Schedule> _schedule;
+
+	Log&             _log;
+	Raul::Semaphore  _sem;
+	Raul::RingBuffer _requests;
+	Raul::RingBuffer _responses;
+	uint8_t* const   _buffer;
+	const uint32_t   _buffer_size;
+	std::thread*     _thread;
+	bool             _exit_flag;
+	bool             _synchronous;
+
+	void run();
+};
+
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_ENGINE_WORKER_HPP