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diff --git a/include/ingen/QueuedInterface.hpp b/include/ingen/QueuedInterface.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2018 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_QUEUEDINTERFACE_HPP
+#define INGEN_QUEUEDINTERFACE_HPP
+
+#include <ingen/Interface.hpp>
+#include <ingen/Message.hpp>
+#include <ingen/URI.hpp>
+
+#include <memory>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace ingen {
+
+/** Stores all messages and emits them to a sink on demand.
+ *
+ * This can be used to make an interface thread-safe.
+ */
+class QueuedInterface : public Interface
+{
+public:
+	explicit QueuedInterface(std::shared_ptr<Interface> sink)
+	    : _sink(std::move(sink))
+	{}
+
+	URI uri() const override { return URI("ingen:/QueuedInterface"); }
+
+	void message(const Message& message) override {
+		const std::lock_guard<std::mutex> lock{_mutex};
+		_messages.emplace_back(message);
+	}
+
+	void emit() {
+		std::vector<Message> messages;
+		{
+			const std::lock_guard<std::mutex> lock{_mutex};
+			_messages.swap(messages);
+		}
+
+		for (const auto& i : messages) {
+			_sink->message(i);
+		}
+	}
+
+	const std::shared_ptr<Interface>& sink() const { return _sink; }
+
+private:
+	std::mutex                 _mutex;
+	std::shared_ptr<Interface> _sink;
+	std::vector<Message>       _messages;
+};
+
+} // namespace ingen
+
+#endif // INGEN_QUEUEDINTERFACE_HPP