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authorDavid Robillard <d@drobilla.net>2006-06-10 01:52:02 +0000
committerDavid Robillard <d@drobilla.net>2006-06-10 01:52:02 +0000
commit98fe0e7056e6697396249531785d3899f94d79be (patch)
tree233319008d4bfb6c8bdc546bdf4a81b87ecf7f3a /src/engine/QueuedEventSource.h
parent6c8eaee73b0ea66216744f49b452e22e26fe83e1 (diff)
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More juggling
git-svn-id: http://svn.drobilla.net/lad/grauph@15 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'src/engine/QueuedEventSource.h')
-rw-r--r--src/engine/QueuedEventSource.h83
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diff --git a/src/engine/QueuedEventSource.h b/src/engine/QueuedEventSource.h
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--- a/src/engine/QueuedEventSource.h
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-/* This file is part of Om. Copyright (C) 2006 Dave Robillard.
- *
- * Om 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.
- *
- * Om 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.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#ifndef QUEUEDEVENTSOURCE_H
-#define QUEUEDEVENTSOURCE_H
-
-#include <cstdlib>
-#include <pthread.h>
-#include "util/types.h"
-#include "util/Semaphore.h"
-#include "EventSource.h"
-
-namespace Om {
-
-class Event;
-class QueuedEvent;
-
-
-/** 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).
- */
-class QueuedEventSource : public EventSource
-{
-public:
- QueuedEventSource(size_t size);
- ~QueuedEventSource();
-
- Event* pop_earliest_event_before(const samplecount time);
-
- void unblock();
-
- void start();
- void stop();
-
-protected:
- void push(QueuedEvent* const ev);
-
-private:
- // Prevent copies (undefined)
- QueuedEventSource(const QueuedEventSource&);
- QueuedEventSource& operator=(const QueuedEventSource&);
-
- // Note that it's crucially important which functions access which of these
- // variables, to maintain threadsafeness.
-
- size_t m_front; ///< Front of queue
- size_t m_back; ///< Back of entire queue (1 past index of back element)
- size_t m_prepared_back; ///< Back of prepared section (1 past index of back prepared element)
- const size_t m_size;
- QueuedEvent** m_events;
-
- bool m_thread_exists;
- bool m_prepare_thread_exit_flag;
- pthread_t m_prepare_thread;
- Semaphore m_semaphore; ///< Counting semaphor for driving prepare thread
- pthread_mutex_t m_blocking_mutex;
- pthread_cond_t m_blocking_cond;
-
- static void* prepare_loop(void* q) { return ((QueuedEventSource*)q)->m_prepare_loop(); }
- void* m_prepare_loop();
-};
-
-
-} // namespace Om
-
-#endif // QUEUEDEVENTSOURCE_H