XBT_PUBLIC void sg_link_data_set(sg_link_t link, void* data);
XBT_PUBLIC int sg_link_count();
XBT_PUBLIC sg_link_t* sg_link_list();
XBT_PUBLIC void sg_link_data_set(sg_link_t link, void* data);
XBT_PUBLIC int sg_link_count();
XBT_PUBLIC sg_link_t* sg_link_list();