Concurrent Haskell (Ops...)

[Andre W B Furtado]

[I mean "CONCURRENT Haskell" rather than "Haskell DIRECT" in the last email. Sorry.]   ------- I am trying to create a program that prints interleaved sequences of 'a's and 'z's, using Haskell Direct (under GHC). I've tryied the following:   import Concurrent   main :: IO() main = let loop ch = putStr(ch) >> loop ch in        forkIO (loop "a") >> loop "z"   But this program prints only 'z's, and no 'a's. I was surprised by this, since GHC uses preemptive multitasking, not cooperative multitasking. Does anyone knows what's going wrong?   Thanks, Andre W B Furtado