Hi I'm using the System.Timeout module from base, copied into my local repo, so that I can work with GHC 6.6.1. My copy is at: http://www.cs.york.ac.uk/fp/darcs/catch/catch_1/System/TimeoutGHC.hs (but it is identical to the one in base) Sadly, it doesn't seem to work for me. Here are the tests I've been using, the results I get, and what I would have liked. All are GHC 6.6 on Windows. -- TEST 1 import System.TimeoutGHC main :: IO () main = do r <- timeout (5 * 10^6) (putStrLn "here") print r Without -threaded: here >> Just () >> wait 5 seconds Without -threaded: here >> wait 5 seconds >> Just () So, either way, I get a 5 second delay - not something I want. -- TEST 2 import System.TimeoutGHC main :: IO () main = do r <- timeout (length [1..]) (putStrLn "here") print r Now, with either -threaded, or without, it never terminates. Basically I can't get the timeout to do anything I would like with any flags. Can someone come to my rescue? Am I getting timeout wrong? Thanks Neil