scan_ds_t
const scan_ds_t *sds_a = a, *sds_b = b;
scan_ds_t *sds;
scan_ds_t srch, *sds;
scan_ds_t *sds;
scan_ds_t srch, *sds;
for (scan_ds_t *sds = avl_first(&scn->scn_queue);
scan_ds_t *sds;
avl_create(&scn->scn_queue, scan_ds_queue_compare, sizeof (scan_ds_t),
offsetof(scan_ds_t, sds_node));