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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_PREPROCESSOR_HPP
+#define INGEN_ENGINE_PREPROCESSOR_HPP
+
+#include <atomic>
+#include <thread>
+#include <mutex>
+
+#include "raul/Semaphore.hpp"
+
+namespace ingen {
+namespace server {
+
+class Engine;
+class Event;
+class PostProcessor;
+class RunContext;
+
+class PreProcessor
+{
+public:
+ explicit PreProcessor(Engine& engine);
+
+ ~PreProcessor();
+
+ /** Return true iff no events are enqueued. */
+ inline bool empty() const { return !_head.load(); }
+
+ /** Enqueue an event.
+ * This is safe to call from any non-realtime thread (it locks).
+ */
+ void event(Event* ev, Event::Mode mode);
+
+ /** Process events for a cycle.
+ * @return The number of events processed.
+ */
+ unsigned process(RunContext& context,
+ PostProcessor& dest,
+ size_t limit = 0);
+
+protected:
+ void run();
+
+private:
+ enum class BlockState {
+ UNBLOCKED, ///< Normal, unblocked execution
+ PRE_BLOCKED, ///< Preprocess thread has enqueued blocking event
+ BLOCKED, ///< Process thread has reached blocking event
+ PRE_UNBLOCKED, ///< Preprocess thread has enqueued unblocking event
+ PROCESSING ///< Process thread is executing all events in-between
+ };
+
+ void wait_for_block_state(const BlockState state) {
+ while (_block_state != state) {
+ std::this_thread::sleep_for(std::chrono::milliseconds(10));
+ }
+ }
+
+ Engine& _engine;
+ std::mutex _mutex;
+ Raul::Semaphore _sem;
+ std::atomic<Event*> _head;
+ std::atomic<Event*> _tail;
+ std::atomic<BlockState> _block_state;
+ bool _exit_flag;
+ std::thread _thread;
+};
+
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_ENGINE_PREPROCESSOR_HPP