X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fgraphnode.cc;h=c8923a043df84f441d2d0f1e316bebb36d84665d;hb=91ab5e31751105d59386aab6a6e16ac5582904dc;hp=7c0bc936d7d3759993cfce41e5e28173ec8cf96f;hpb=5ce3409e5debaf9d42749cb69c544a09c550f43a;p=ardour.git

diff --git a/libs/ardour/graphnode.cc b/libs/ardour/graphnode.cc
index 7c0bc936d7..c8923a043d 100644
--- a/libs/ardour/graphnode.cc
+++ b/libs/ardour/graphnode.cc
@@ -24,9 +24,9 @@
 
 using namespace ARDOUR;
 
-GraphNode::GraphNode (graph_ptr_t graph)
+GraphNode::GraphNode (boost::shared_ptr<Graph> graph)
         : _graph(graph)
-{ 
+{
 }
 
 GraphNode::~GraphNode()
@@ -36,14 +36,22 @@ GraphNode::~GraphNode()
 void
 GraphNode::prep (int 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))
+        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
@@ -52,12 +60,14 @@ GraphNode::finish (int chain)
         node_set_t::iterator i;
         bool feeds_somebody = false;
 
+	/* 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) {
+		/* This node does not feed anybody, so decrement the graph's finished count */
                 _graph->dec_ref();
         }
 }