+XBT_PUBLIC msg_process_t MSG_process_self();
+XBT_PUBLIC aid_t MSG_process_self_PID();
+XBT_PUBLIC aid_t MSG_process_self_PPID();
+XBT_PUBLIC const char* MSG_process_self_name();
+XBT_PUBLIC void MSG_process_ref(msg_process_t process);
+XBT_PUBLIC void MSG_process_unref(msg_process_t process);