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-/* This file is part of Ingen.
- * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
- *
- * Ingen is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at your option) 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 General Public License for details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef QUEUEDEVENTSOURCE_H
-#define QUEUEDEVENTSOURCE_H
-
-#include <cstdlib>
-#include <pthread.h>
-#include "types.hpp"
-#include <raul/Semaphore.hpp>
-#include <raul/AtomicInt.hpp>
-#include <raul/SRSWQueue.hpp>
-#include <raul/Slave.hpp>
-#include "Event.hpp"
-#include "EventSource.hpp"
-
-using Raul::AtomicInt;
-
-namespace Ingen {
-
-class QueuedEvent;
-class PostProcessor;
-
-
-/** Queue of events that need processing before reaching the audio thread.
- *
- * Implemented as a deque (ringbuffer) in a circular array. Pushing and
- * popping are threadsafe, as long as a single thread pushes and a single
- * thread pops (ie this data structure is threadsafe, but the push and pop
- * methods themselves are not). Creating an instance of this class spawns
- * a pre-processing thread to prepare queued events.
- *
- * This class is it's own slave. :)
- */
-class QueuedEventSource : public EventSource, protected Raul::Slave
-{
-public:
- QueuedEventSource(size_t queued_size, size_t stamped_size);
- ~QueuedEventSource();
-
- void activate() { Slave::start(); }
- void deactivate() { Slave::stop(); }
-
- void process(PostProcessor& dest, ProcessContext& context);
-
- void unblock();
-
-protected:
- void push_queued(QueuedEvent* const ev);
- inline void push_stamped(Event* const ev) { _stamped_queue.push(ev); }
- Event* pop_earliest_queued_before(const SampleCount time);
- inline Event* pop_earliest_stamped_before(const SampleCount time);
-
- inline bool unprepared_events() { return (_prepared_back.get() != _back.get()); }
-
- virtual void _whipped(); ///< Prepare 1 event
-
-private:
- // Note that it's crucially important which functions access which of these
- // variables, to maintain threadsafeness.
-
- //(FIXME: make this a separate class?)
- // 2-part queue for events that require pre-processing:
- AtomicInt _front; ///< Front of queue
- AtomicInt _back; ///< Back of entire queue (1 past index of back element)
- AtomicInt _prepared_back; ///< Back of prepared section (1 past index of back prepared element)
- const size_t _size;
- QueuedEvent** _events;
- Raul::Semaphore _blocking_semaphore;
-
- Raul::Semaphore _full_semaphore;
-
- /** Queue for timestamped events (no pre-processing). */
- Raul::SRSWQueue<Event*> _stamped_queue;
-};
-
-
-/** Pops the realtime (timestamped, not preprocessed) event off the realtime queue.
- *
- * Engine will use the sample timestamps of returned events directly and execute the
- * event with sample accuracy. Timestamps in the past will be bumped forward to
- * the beginning of the cycle (offset 0), when eg. skipped cycles occur.
- */
-inline Event*
-QueuedEventSource::pop_earliest_stamped_before(const SampleCount time)
-{
- Event* ret = NULL;
-
- if (!_stamped_queue.empty()) {
- if (_stamped_queue.front()->time() < time) {
- ret = _stamped_queue.front();
- _stamped_queue.pop();
- }
- }
-
- return ret;
-}
-
-
-/** Signal that the blocking event is finished.
- *
- * When this is called preparing will resume. This MUST be called by
- * blocking events in their post_process() method.
- */
-inline void
-QueuedEventSource::unblock()
-{
- _blocking_semaphore.post();
-}
-
-
-} // namespace Ingen
-
-#endif // QUEUEDEVENTSOURCE_H