+ * Looks up whether a given promise should be satisfied by this node.
+ * @param i The promise index.
+ * @return true if the promise should be satisfied by the given model action.
+ */
+bool Node::get_promise(unsigned int i) const
+{
+ return (i < promises.size()) && ((promises[i] & PROMISE_MASK) == PROMISE_FULFILLED);
+}
+
+/**
+ * Increments to the next combination of promises.
+ * @return true if we have a valid combination.
+ */
+bool Node::increment_promise()
+{
+ DBG();
+ unsigned int rmw_count = 0;
+ for (unsigned int i = 0; i < promises.size(); i++) {
+ if (promises[i] == (PROMISE_RMW|PROMISE_FULFILLED))
+ rmw_count++;
+ }
+
+ for (unsigned int i = 0; i < promises.size(); i++) {
+ if ((promises[i] & PROMISE_MASK) == PROMISE_UNFULFILLED) {
+ if ((rmw_count > 0) && (promises[i] & PROMISE_RMW)) {
+ //sending our value to two rmws... not going to work..try next combination
+ continue;
+ }
+ promises[i] = (promises[i] & PROMISE_RMW) |PROMISE_FULFILLED;
+ while (i > 0) {
+ i--;
+ if ((promises[i] & PROMISE_MASK) == PROMISE_FULFILLED)
+ promises[i] = (promises[i] & PROMISE_RMW) | PROMISE_UNFULFILLED;
+ }
+ return true;
+ } else if (promises[i] == (PROMISE_RMW|PROMISE_FULFILLED)) {
+ rmw_count--;
+ }
+ }
+ return false;
+}
+
+/**
+ * Returns whether the promise set is empty.
+ * @return true if we have explored all promise combinations.
+ */
+bool Node::promise_empty() const
+{
+ bool fulfilledrmw = false;
+ for (int i = promises.size() - 1; i >= 0; i--) {
+ if (promises[i] == PROMISE_UNFULFILLED)
+ return false;
+ if (!fulfilledrmw && ((promises[i]&PROMISE_MASK) == PROMISE_UNFULFILLED))
+ return false;
+ if (promises[i] == (PROMISE_FULFILLED|PROMISE_RMW))
+ fulfilledrmw = true;
+ }
+ return true;
+}
+
+
+void Node::set_misc_max(int i)
+{
+ misc_max = i;
+}
+
+int Node::get_misc() const
+{
+ return misc_index;
+}
+
+bool Node::increment_misc()
+{
+ return (misc_index < misc_max) && ((++misc_index) < misc_max);
+}
+
+bool Node::misc_empty() const
+{
+ return (misc_index + 1) >= misc_max;
+}
+
+
+/**
+ * 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
+ *