+XBT_PUBLIC sg_actor_t sg_actor_self();
+XBT_PUBLIC aid_t sg_actor_self_get_pid();
+XBT_PUBLIC aid_t sg_actor_self_get_ppid();
+XBT_PUBLIC const char* sg_actor_self_get_name();
+XBT_PUBLIC void sg_actor_ref(sg_actor_t actor);
+XBT_PUBLIC void sg_actor_unref(sg_actor_t actor);
+