+ int num_executions;
+
+ ModelAction * get_last_conflict(ModelAction *act);
+ void set_backtracking(ModelAction *act);
+ thread_id_t advance_backtracking_state();
+ thread_id_t get_next_replay_thread();
+
+ class ModelAction *current_action;
+ Backtrack *exploring;
+ thread_id_t nextThread;
+
+ action_list_t *action_trace;
+ std::map<thread_id_t, class Thread *> thread_map;
+ class TreeNode *rootNode, *currentNode;
+ std::list<class Backtrack *> backtrack_list;