Asynchronus serial port

[Fenixk19]

Hello! I've already post the
bug(http://bugs.winehq.org/show_bug.cgi?id=19713) on this subject, but i
need more help. So I've decided to write here.
There is a problem in wine. When I use asynchronous serial port read, 
data never comes. Event, caused by select comes. But operation status
stays pending, and i can't do anything to this serial port anymore. In
windows it never get pending, and port can be accessed just after data
arrival. Seems to be wineserver problem, but i don't know, where to look
at. What code respond for asynchronous serial port in wineserver?
Alexander.
P.S. Test program attached.