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/*
Copyright (C) 2012 Paul Davis
Author: David Robillard
This program 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.
This program 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 more 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_worker_h__
#define __ardour_worker_h__
#include <stdint.h>
#include <glibmm/thread.h>
#include "pbd/ringbuffer.h"
#include "pbd/semaphore.h"
namespace ARDOUR {
/**
An object that needs to schedule non-RT work in the audio thread.
*/
class Workee {
public:
virtual ~Workee() {}
/**
Do some work in the worker thread.
*/
virtual void work(uint32_t size, const void* data) = 0;
/**
Handle a response from the worker thread in the audio thread.
*/
virtual void work_response(uint32_t size, const void* data) = 0;
};
/**
A worker thread for non-realtime tasks scheduled in the audio thread.
*/
class Worker
{
public:
Worker(Workee* workee, uint32_t ring_size);
~Worker();
/**
Schedule work (audio thread).
@return false on error.
*/
bool schedule(uint32_t size, const void* data);
/**
Respond from work (worker thread).
@return false on error.
*/
bool respond(uint32_t size, const void* data);
/**
Emit any pending responses (audio thread).
*/
void emit_responses();
private:
void run();
Workee* _workee;
Glib::Thread* _thread;
RingBuffer<uint8_t>* _requests;
RingBuffer<uint8_t>* _responses;
uint8_t* _response;
PBD::Semaphore _sem;
bool _exit;
};
} // namespace ARDOUR
#endif /* __ardour_worker_h__ */
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