/** Add a function to the list of "on_exit" functions for the current actor. The on_exit functions are the functions
* executed when your actor is killed. You should use them to free the data used by your actor.
+ *
+ * Please note that functions registered in this signal cannot do any simcall themselves. It means that they cannot
+ * send or receive messages, acquire or release mutexes, nor even modify an host property or something. Not only are
+ * blocking functions forbidden in this setting, but also modifications to the global state.
*/
void on_exit(std::function<void(int, void*)> fun, void* data);
