+/** Can this requests can be executed?
+ *
+ * Most requests are always enabled but WAIT and WAITANY
+ * are not always enabled: a WAIT where the communication does not
+ * have both a source and a destination yet is not enabled
+ * (unless timeout is enabled in the wait and enabeld in SimGridMC).
+ */
+XBT_PRIVATE bool request_is_enabled(smx_simcall_t req);
+
+/** Execute everything which is invisible
+ *
+ * Execute all the processes that are ready to run and all invisible simcalls
+ * iteratively until there doesn't remain any. At this point, the function
+ * returns to the caller which can handle the visible (and ready) simcalls.
+ */
+XBT_PRIVATE void wait_for_requests();
+
+XBT_PRIVATE extern std::vector<double> processes_time;
+
+/** Execute a given simcall */
+XBT_PRIVATE void handle_simcall(smx_simcall_t req, int req_num);
+
+/** Check if the given simcall is visible
+ *
+ * \return `TRUE` or `FALSE`
+ */
+XBT_PRIVATE bool request_is_visible(smx_simcall_t req);
+
+}
+}
+
+#endif