[Twisted-Python] callFromThread with return

Hello! Suppose I run task in worker thread (e.g. database transaction) and I need to do some IO (PB call) and get the result from it during transaction. Since I run not in reactor's thread it's ok to block and wait for the result. I know that there is callFromThread but it never return any result. Is it possible to implement something like callFromThread that can block, wait for result and return it? Thanks in advance, Egor.