butler.h

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/*
 * Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2010-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
 * Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <atomic>
 
#include <pthread.h>
 
#include <glibmm/threads.h>
 
#include "pbd/crossthread.h"
#include "pbd/pool.h"
#include "pbd/ringbuffer.h"
#include "pbd/mpmc_queue.h"
 
#include "ardour/libardour_visibility.h"
#include "ardour/session_handle.h"
#include "ardour/types.h"
 
namespace ARDOUR
{
class LIBARDOUR_API Butler : public SessionHandleRef
{
public:
        Butler (Session& session);
        ~Butler ();
 
        int  start_thread ();
        void terminate_thread ();
        void schedule_transport_work ();
        void summon ();
        void stop ();
        void wait_until_finished ();
        bool transport_work_requested () const;
        void drop_references ();
 
        void map_parameters ();
 
        bool delegate (sigc::slot<void> const& work) {
                bool rv = _delegated_work.push_back (work);
                summon ();
                return rv;
        }
        samplecnt_t audio_capture_buffer_size () const
        {
                return _audio_capture_buffer_size;
        }
        samplecnt_t audio_playback_buffer_size () const
        {
                return _audio_playback_buffer_size;
        }
        uint32_t midi_buffer_size () const
        {
                return _midi_buffer_size;
        }
 
        mutable std::atomic<int> should_do_transport_work;
 
private:
        struct Request {
                enum Type {
                        Run,
                        Pause,
                        Quit
                };
        };
 
 
        static void* _thread_work (void* arg);
 
        void* thread_work ();
 
        void empty_pool_trash ();
        void process_delegated_work ();
        void config_changed (std::string);
        bool flush_tracks_to_disk_normal (std::shared_ptr<RouteList const>, uint32_t& errors);
        void queue_request (Request::Type r);
 
        pthread_t thread;
        bool      have_thread;
 
        Glib::Threads::Mutex request_lock;
        Glib::Threads::Cond  paused;
        bool                 should_run;
 
        samplecnt_t _audio_capture_buffer_size;
        samplecnt_t _audio_playback_buffer_size;
        uint32_t    _midi_buffer_size;
 
        PBD::RingBuffer<PBD::CrossThreadPool*> pool_trash;
        CrossThreadChannel                    _xthread;
        PBD::MPMCQueue<sigc::slot<void> >     _delegated_work;
};
 
} // namespace ARDOUR