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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_RUNNER_HPP
+#define INGEN_ENGINE_RUNNER_HPP
+
+namespace Ingen {
+namespace Server {
+
+class Task;
+class BlockImpl;
+
+class Runner
+{
+public:
+ virtual ~Runner() = default;
+
+ /** Claim a parallel task, and signal others that work is available. */
+ virtual void claim_task(Task* task) = 0;
+
+ /** Steal a task from some other context if possible. */
+ virtual Task* steal_task() const = 0;
+
+ /** Run `unit`. */
+ virtual void run_unit(BlockImpl* unit) = 0;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_RUNNER_HPP