X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fgraphnode.cc;h=47cabfbae09ae7c4152bc39bc3d4709b5233efb3;hb=5694d877aaf4e69c90f76aa592e110289cbe81c6;hp=8a2deed80817cc15cccb60316ccd69df86b69ea1;hpb=a473d630eb165272992e90f8d854b1d66ec0be63;p=ardour.git

diff --git a/libs/ardour/graphnode.cc b/libs/ardour/graphnode.cc
index 8a2deed808..47cabfbae0 100644
--- a/libs/ardour/graphnode.cc
+++ b/libs/ardour/graphnode.cc
@@ -24,8 +24,8 @@
 
 using namespace ARDOUR;
 
-GraphNode::GraphNode (graph_ptr_t graph)
-        : _graph(graph)
+GraphNode::GraphNode (boost::shared_ptr<Graph> graph)
+	: _graph(graph)
 {
 }
 
@@ -36,35 +36,45 @@ 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));
 }