+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);