X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=cyclegraph.cc;h=eaddc8e1714629f8834a5b11c891f8009b2e1237;hb=ae1340cbd7d2f75d76a4199597f454290badcc8b;hp=23e5eca4ec82d28d07393ba7cab344d0837920fd;hpb=8e7d06831c75df291170b57a5573efead68eaad9;p=model-checker.git

diff --git a/cyclegraph.cc b/cyclegraph.cc
index 23e5eca..eaddc8e 100644
--- a/cyclegraph.cc
+++ b/cyclegraph.cc
@@ -168,13 +168,16 @@ bool CycleGraph::mergeNodes(CycleNode *w_node, CycleNode *p_node,
  * Adds an edge between two CycleNodes.
  * @param fromnode The edge comes from this CycleNode
  * @param tonode The edge points to this CycleNode
+ * @return True, if new edge(s) are added; otherwise false
  */
-void CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode)
+bool CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode)
 {
+	bool added;
+
 	if (!hasCycles)
 		hasCycles = checkReachable(tonode, fromnode);
 
-	if (fromnode->addEdge(tonode))
+	if ((added = fromnode->addEdge(tonode)))
 		rollbackvector.push_back(fromnode);
 
 	/*
@@ -186,9 +189,12 @@ void CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode)
 		if (!hasCycles)
 			hasCycles = checkReachable(tonode, rmwnode);
 
-		if (rmwnode->addEdge(tonode))
+		if (rmwnode->addEdge(tonode)) {
 			rollbackvector.push_back(rmwnode);
+			added = true;
+		}
 	}
+	return added;
 }
 
 /**
@@ -295,6 +301,7 @@ bool CycleGraph::checkReachable(const CycleNode *from, const CycleNode *to) cons
 	return false;
 }
 
+/** @return True, if the promise has failed; false otherwise */
 bool CycleGraph::checkPromise(const ModelAction *fromact, Promise *promise) const
 {
 	std::vector< CycleNode *, ModelAlloc<CycleNode *> > queue;