st_sync
st->rstate = st_sync;
st->wstate = st_sync;
if (st->rstate != st_sync)
st->wstate = st_sync;
if (st->rstate != st_sync)
st->wstate = st_sync;
st->rstate = st_sync;
st->rstate = st_sync;
st->rstate = st_sync;
llst.rstate = st_sync;
llst.wstate = st_sync;
if (st->rstate != st_sync || st->wstate != st_sync)
if (st->rstate != st_sync)
if (st->rstate != st_sync || st->wstate != st_sync)