using namespace ARDOUR;
-GraphNode::GraphNode (graph_ptr_t graph)
- : _graph(graph)
-{
+GraphNode::GraphNode (boost::shared_ptr<Graph> graph)
+ : _graph(graph)
+{
}
GraphNode::~GraphNode()
void
GraphNode::prep (int chain)
{
- _refcount = _init_refcount[chain];
+ /* This is the number of nodes that directly feed us */
+ _refcount = _init_refcount[chain];
}
+/** Called by another node to tell us that one of the nodes that feed us
+ * has been processed.
+ */
void
GraphNode::dec_ref()
{
- if (g_atomic_int_dec_and_test (&_refcount))
- _graph->trigger (this);
+ if (g_atomic_int_dec_and_test (&_refcount)) {
+ /* All the nodes that feed us are done, so we can queue this node
+ * for processing.
+ */
+ _graph->trigger (this);
+ }
}
void
GraphNode::finish (int chain)
{
- node_set_t::iterator i;
- bool feeds_somebody = false;
+ node_set_t::iterator i;
+ bool feeds_somebody = false;
- for (i=_activation_set[chain].begin(); i!=_activation_set[chain].end(); i++) {
- (*i)->dec_ref();
- feeds_somebody = true;
- }
+ /* Tell the nodes that we feed that we've finished */
+ for (i=_activation_set[chain].begin(); i!=_activation_set[chain].end(); i++) {
+ (*i)->dec_ref();
+ feeds_somebody = true;
+ }
- if (!feeds_somebody) {
- _graph->dec_ref();
- }
+ if (!feeds_somebody) {
+ /* This node does not feed anybody, so decrement the graph's finished count */
+ _graph->dec_ref();
+ }
}
void
GraphNode::process()
{
- _graph->process_one_route (dynamic_cast<Route *>(this));
+ _graph->process_one_route (dynamic_cast<Route *>(this));
}