Promise::Promise(ModelAction *read, struct future_value fv) :
num_available_threads(0),
fv(fv),
- read(read),
+ 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.
/** @brief Print debug info about the Promise */
void Promise::print() const
{
- model_print("Promised value %#" PRIx64 ", read from thread %d, available threads to resolve: ", fv.value, id_to_int(read->get_tid()));
+ model_print("Promised value %#" PRIx64 ", first read from thread %d, available threads to resolve: ",
+ fv.value, id_to_int(get_reader(0)->get_tid()));
+ bool failed = true;
for (unsigned int i = 0; i < available_thread.size(); i++)
- if (available_thread[i])
+ if (available_thread[i]) {
model_print("[%d]", i);
+ failed = false;
+ }
+ if (failed)
+ model_print("(none)");
model_print("\n");
}
*/
bool Promise::is_compatible(const ModelAction *act) const
{
- return thread_is_available(act->get_tid()) && read->same_var(act);
+ return thread_is_available(act->get_tid()) && get_reader(0)->same_var(act);
}
/**
{
return get_num_available_threads() == 1 && is_compatible(act);
}
+
+/**
+ * @brief Check if a store's value matches this Promise
+ * @param write The store to check
+ * @return True if the store's written value matches this Promise
+ */
+bool Promise::same_value(const ModelAction *write) const
+{
+ return get_value() == write->get_write_value();
+}
+
+/**
+ * @brief Check if a ModelAction's location matches this Promise
+ * @param act The ModelAction to check
+ * @return True if the action's location matches this Promise
+ */
+bool Promise::same_location(const ModelAction *act) const
+{
+ return get_reader(0)->same_var(act);
+}
+
+/** @brief Get this Promise's index within the execution's promise array */
+int Promise::get_index() const
+{
+ return model->get_promise_number(this);
+}