BackgrounDRB alternative for Windows?

I use WinXP + cygwin's ruby and have no problems to use the latest

I have used BackgrounDrb on my XP for some heavy tasks and I do not
encounter any problem with it.
The only problem that I have with it is when I ported my solution to
use SQLite with concurrent approaches to the embedded data base,
namely resource locking.
But, that's the SQLite problem not the BackgrounDrb's.