+/** Fulfill a promise by executing a given code */
+template<class R, class F>
+void fulfill_promise(std::promise<R>& promise, F&& code)
+{
+ try {
+ promise.set_value(std::forward<F>(code)());
+ }
+ catch(...) {
+ promise.set_exception(std::current_exception());
+ }
+}
+
+/** Fulfill a promise by executing a given code
+ *
+ * This is a special version for `std::promise<void>` because the default
+ * version does not compile in this case.
+ */
+template<class F>
+void fulfill_promise(std::promise<void>& promise, F&& code)
+{
+ try {
+ std::forward<F>(code)();
+ promise.set_value();
+ }
+ catch(...) {
+ promise.set_exception(std::current_exception());
+ }
+}
+
+/** Execute some code in the kernel/maestro
+ *
+ * This can be used to enforce mutual exclusion with other simcall.
+ * More importantly, this enforces a deterministic/reproducible ordering
+ * of the operation with respect to other simcalls.
+ */