void _RBT_Insert(EDF_Chain_Control *chain,EDF_Node *node);
void _RBT_Extract(EDF_Chain_Control *chain,EDF_Node *node);
EDF_Node* _RBT_Search(EDF_Chain_Control *chain,Deadline_Control absdeadline);
-boolean _RBT_Has_only_one_node(EDF_Chain_Control *chain);
+int _RBT_Has_only_one_node(EDF_Chain_Control *chain);
#ifdef __cplusplus