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-rw-r--r--src/server/PreProcessor.hpp87
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diff --git a/src/server/PreProcessor.hpp b/src/server/PreProcessor.hpp
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--- a/src/server/PreProcessor.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_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