add copyright message

[model-checker.git] / nodestack.cc

diff --git a/nodestack.cc b/nodestack.cc
index c757af25f647339fe7ef590ad1eb989271aff222..b9142435c5267f276d10ed9b9c5c315801bfd6f7 100644 (file)
--- a/nodestack.cc
+++ b/nodestack.cc
@@ -96,7 +96,8 @@ int Node::get_yield_data(int tid1, int tid2) const {
 }
 
 void Node::update_yield(Scheduler * scheduler) {
-       yield_data=(int *) model_calloc(1, sizeof(int)*num_threads*num_threads);
+       if (yield_data==NULL)
+               yield_data=(int *) model_calloc(1, sizeof(int)*num_threads*num_threads);
        //handle base case
        if (parent == NULL) {
                for(int i = 0; i < num_threads*num_threads; i++) {