worker.h

Go to the documentation of this file.

/*
  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/threads.h>

#include "pbd/ringbuffer.h"
#include "pbd/semaphore.h"

#include "ardour/libardour_visibility.h"

namespace ARDOUR {

class LIBARDOUR_API Workee {
public:
        virtual ~Workee() {}

        virtual int work(uint32_t size, const void* data) = 0;

        virtual int work_response(uint32_t size, const void* data) = 0;
};

class LIBARDOUR_API Worker
{
public:
        Worker(Workee* workee, uint32_t ring_size);
        ~Worker();

        bool schedule(uint32_t size, const void* data);

        bool respond(uint32_t size, const void* data);

        void emit_responses();

private:
        void run();
        bool verify_message_completeness(RingBuffer<uint8_t>* rb);

        Workee*                _workee;
        RingBuffer<uint8_t>*   _requests;
        RingBuffer<uint8_t>*   _responses;
        uint8_t*               _response;
        PBD::Semaphore         _sem;
        bool                   _exit;
        Glib::Threads::Thread* _thread;

};

} // namespace ARDOUR

#endif  /* __ardour_worker_h__ */