+ }
+}
+
+bool ModelHistory::skip_action(ModelAction * act)
+{
+ bool second_part_of_rmw = act->is_rmwc() || act->is_rmw();
+ modelclock_t curr_seq_number = act->get_seq_number();
+
+ /* Skip actions that are second part of a read modify write */
+ if (second_part_of_rmw)
+ return true;
+
+ /* Skip actions with the same sequence number */
+ if (last_action != NULL) {
+ if (last_action->get_seq_number() == curr_seq_number)
+ return true;
+ }
+
+ /* Skip actions that are paused by fuzzer (sequence number is 0) */
+ if (curr_seq_number == 0)
+ return true;
+
+ return false;
+}
+
+/* Monitor thread tid and decide whether other threads (that are waiting for tid)
+ * should keep waiting for this thread or not. Shall only be called when a thread
+ * enters a function.
+ *
+ * Heuristics: If the distance from the current FuncNode to some target node
+ * ever increases, stop waiting for this thread on this target node.
+ */
+void ModelHistory::monitor_waiting_thread(uint32_t func_id, thread_id_t tid)
+{
+ WaitObj * wait_obj = getWaitObj(tid);
+ thrd_id_set_t * waited_by = wait_obj->getWaitedBy();
+ FuncNode * curr_node = func_nodes[func_id];
+
+ /* For each thread waiting for tid */
+ thrd_id_set_iter * tid_iter = waited_by->iterator();
+ while (tid_iter->hasNext()) {
+ thread_id_t waited_by_id = tid_iter->next();
+ WaitObj * other_wait_obj = getWaitObj(waited_by_id);
+
+ node_set_t * target_nodes = other_wait_obj->getTargetNodes(tid);
+ node_set_iter * node_iter = target_nodes->iterator();
+ while (node_iter->hasNext()) {
+ FuncNode * target = node_iter->next();
+ int old_dist = other_wait_obj->lookup_dist(tid, target);
+ int new_dist = curr_node->compute_distance(target, old_dist);
+
+ if (new_dist == -1) {
+ stop_waiting_for_node(waited_by_id, tid, target);
+ }
+ }
+
+ delete node_iter;
+ }
+
+ delete tid_iter;
+}
+
+void ModelHistory::monitor_waiting_thread_counter(thread_id_t tid)
+{
+ WaitObj * wait_obj = getWaitObj(tid);
+ thrd_id_set_t * waited_by = wait_obj->getWaitedBy();
+
+ // Thread tid has taken an action, update the counter for threads waiting for tid
+ thrd_id_set_iter * tid_iter = waited_by->iterator();
+ while (tid_iter->hasNext()) {
+ thread_id_t waited_by_id = tid_iter->next();
+ WaitObj * other_wait_obj = getWaitObj(waited_by_id);
+
+ bool expire = other_wait_obj->incr_counter(tid);
+ if (expire) {
+// model_print("thread %d stops waiting for thread %d\n", waited_by_id, tid);
+ wait_obj->remove_waited_by(waited_by_id);
+ other_wait_obj->remove_waiting_for(tid);
+
+ thrd_id_set_t * other_waiting_for = other_wait_obj->getWaitingFor();
+ if ( other_waiting_for->isEmpty() ) {
+ // model_print("\tthread %d waits for nobody, wake up\n", self_id);
+ ModelExecution * execution = model->get_execution();
+ Thread * thread = execution->get_thread(waited_by_id);
+ ((NewFuzzer *)execution->getFuzzer())->notify_paused_thread(thread);
+ }
+ }
+ }
+
+ delete tid_iter;
+}
+
+/* Reallocate some snapshotted memories when new executions start */
+void ModelHistory::set_new_exec_flag()
+{
+ for (uint i = 1;i < func_nodes.size();i++) {
+ FuncNode * func_node = func_nodes[i];
+ func_node->set_new_exec_flag();
+ }
+}
+
+void ModelHistory::dump_func_node_graph()
+{
+ model_print("digraph func_node_graph {\n");
+ for (uint i = 1;i < func_nodes.size();i++) {
+ FuncNode * node = func_nodes[i];
+ ModelList<FuncNode *> * out_edges = node->get_out_edges();
+
+ model_print("\"%p\" [label=\"%s\"]\n", node, node->get_func_name());
+ mllnode<FuncNode *> * it;
+ for (it = out_edges->begin();it != NULL;it = it->getNext()) {
+ FuncNode * other = it->getVal();
+ model_print("\"%p\" -> \"%p\"\n", node, other);
+ }
+ }
+ model_print("}\n");
+}
+
+void ModelHistory::print_func_node()
+{
+ /* function id starts with 1 */
+ for (uint32_t i = 1;i < func_nodes.size();i++) {
+ FuncNode * func_node = func_nodes[i];
+ func_node->print_predicate_tree();