+ if (read_from_promise_idx < ((int)read_from_promises.size())) {
+ read_from_promise_idx++;
+ return (read_from_promise_idx < ((int)read_from_promises.size()));
+ }
+ return false;
+}
+
+/************************* end read_from_promises *****************************/
+
+/****************************** future values *********************************/
+
+/**
+ * Adds a value from a weakly ordered future write to backtrack to. This
+ * operation may "fail" if the future value has already been run (within some
+ * sloppiness window of this expiration), or if the futurevalues set has
+ * reached its maximum.
+ * @see model_params.maxfuturevalues
+ *
+ * @param value is the value to backtrack to.
+ * @return True if the future value was successully added; false otherwise
+ */
+bool Node::add_future_value(struct future_value fv)
+{
+ uint64_t value = fv.value;
+ modelclock_t expiration = fv.expiration;
+ thread_id_t tid = fv.tid;
+ int idx = -1; /* Highest index where value is found */
+ for (unsigned int i = 0; i < future_values.size(); i++) {
+ if (future_values[i].value == value && future_values[i].tid == tid) {
+ if (expiration <= future_values[i].expiration)
+ return false;
+ idx = i;
+ }
+ }
+ if (idx > future_index) {
+ /* Future value hasn't been explored; update expiration */
+ future_values[idx].expiration = expiration;
+ return true;
+ } else if (idx >= 0 && expiration <= future_values[idx].expiration + model->params.expireslop) {
+ /* Future value has been explored and is within the "sloppy" window */
+ return false;
+ }