[Haskell-cafe] forkIO on GHCI does not seem to spawn the thread in the background on some OSs

Hi, I found that on windows and my ubuntu box, when I did this ghci> t <- forkIO someAction "someAction" started executing in the foreground - as in, the ghci prompt did not come back (until I pressed Ctrl-C) On my mac however, when I ran the same thing, the action started executing in the background and ghci> prompt returned instantaneously. How can I get the thread backgrounded explicitly? Regards, Kashyap