+XBT_PUBLIC void sg_actor_join(sg_actor_t actor, double timeout);
+XBT_PUBLIC void sg_actor_kill(sg_actor_t actor);
+XBT_PUBLIC void sg_actor_kill_all();
+XBT_PUBLIC void sg_actor_set_kill_time(sg_actor_t actor, double kill_time);
+XBT_PUBLIC void sg_actor_yield();