+ int next_thread_id;
+ modelclock_t used_sequence_numbers;
+ int num_executions;
+
+ /**
+ * Stores the ModelAction for the current thread action. Call this
+ * immediately before switching from user- to system-context to pass
+ * data between them.
+ * @param act The ModelAction created by the user-thread action
+ */
+ void set_current_action(ModelAction *act) { current_action = act; }
+
+ ModelAction * get_last_conflict(ModelAction *act);
+ void set_backtracking(ModelAction *act);
+ thread_id_t get_next_replay_thread();
+ ModelAction * get_next_backtrack();
+ void reset_to_initial_state();
+
+ void add_action_to_lists(ModelAction *act);
+ ModelAction * get_last_action(thread_id_t tid);
+ ModelAction * get_parent_action(thread_id_t tid);
+ ModelAction * get_last_seq_cst(const void *location);
+ void build_reads_from_past(ModelAction *curr);
+ void r_modification_order(ModelAction * curr, const ModelAction *rf);
+ void w_modification_order(ModelAction * curr);
+
+
+ ModelAction *current_action;
+ ModelAction *diverge;
+ thread_id_t nextThread;
+
+ ucontext_t *system_context;