82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/*
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* Copyright (C) 2010-2011 David Robillard <d@drobilla.net>
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* Copyright (C) 2011 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2017-2019 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "ardour/graph.h"
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#include "ardour/graphnode.h"
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#include "ardour/route.h"
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using namespace ARDOUR;
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GraphNode::GraphNode (boost::shared_ptr<Graph> graph)
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: _graph (graph)
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{
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}
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GraphNode::~GraphNode ()
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{
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}
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void
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GraphNode::prep (int chain)
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{
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/* This is the number of nodes that directly feed us */
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g_atomic_int_set (&_refcount, _init_refcount[chain]);
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}
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/** Called by an upstream node, when it has completed processing */
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void
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GraphNode::trigger ()
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{
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/* check if we can run */
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if (g_atomic_int_dec_and_test (&_refcount)) {
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#if 0 // TODO optimize: remove prep()
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/* reset reference count for next cycle */
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g_atomic_int_set (&_refcount, _init_refcount[chain]);
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#endif
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/* All nodes that feed this node have completed, so this node be processed now. */
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_graph->trigger (this);
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}
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}
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void
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GraphNode::finish (int chain)
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{
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node_set_t::iterator i;
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bool feeds = false;
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/* Notify downstream nodes that depend on this node */
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for (i = _activation_set[chain].begin (); i != _activation_set[chain].end (); ++i) {
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(*i)->trigger ();
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feeds = true;
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}
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if (!feeds) {
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/* This node is a terminal node that does not feed another note,
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* so notify the graph to decrement the the finished count */
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_graph->reached_terminal_node ();
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}
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}
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void
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GraphNode::process ()
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{
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_graph->process_one_route (dynamic_cast<Route*> (this));
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}
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