-bool Promise::increment_threads(thread_id_t tid) {
- unsigned int id=id_to_int(tid);
- if ( id >= synced_thread.size() ) {
- synced_thread.resize(id+1, false);
- }
- if (synced_thread[id])
+/**
+ * @brief Promise constructor
+ * @param read The read which reads from a promised future value
+ * @param fv The future value that is promised
+ */
+Promise::Promise(ModelAction *read, struct future_value fv) :
+ num_available_threads(0),
+ fv(fv),
+ readers(1, read),
+ write(NULL)
+{
+ add_thread(fv.tid);
+ eliminate_thread(read->get_tid());
+}
+
+/**
+ * Add a reader that reads from this Promise. Must be added in an order
+ * consistent with execution order.
+ *
+ * @param reader The ModelAction that reads from this promise. Must be a read.
+ * @return True if this new reader has invalidated the promise; false otherwise
+ */
+bool Promise::add_reader(ModelAction *reader)
+{
+ readers.push_back(reader);
+ return eliminate_thread(reader->get_tid());
+}
+
+/**
+ * Access a reader that read from this Promise. Readers must be inserted in
+ * order by execution order, so they can be returned in this order.
+ *
+ * @param i The index of the reader to return
+ * @return The i'th reader of this Promise
+ */
+ModelAction * Promise::get_reader(unsigned int i) const
+{
+ return i < readers.size() ? readers[i] : NULL;
+}
+
+/**
+ * Eliminate a thread which no longer can satisfy this promise. Once all
+ * enabled threads have been eliminated, this promise is unresolvable.
+ *
+ * @param tid The thread ID of the thread to eliminate
+ * @return True, if this elimination has invalidated the promise; false
+ * otherwise
+ */
+bool Promise::eliminate_thread(thread_id_t tid)
+{
+ unsigned int id = id_to_int(tid);
+ if (!thread_is_available(tid))