cache_mp_read_session
cache_mp_read_session open_cache_mp_read_session(cache_entry);
int cache_mp_read(cache_mp_read_session, char *, size_t *);
void close_cache_mp_read_session(cache_mp_read_session);
cache_mp_read_session rs;
(cache_mp_read_session)qstate->mdata, NULL,
(cache_mp_read_session)qstate->mdata,
close_cache_mp_read_session((cache_mp_read_session)qstate->mdata);
(cache_mp_read_session)qstate->mdata);