> > > $ ghci > GHCi, version 6.12.3: http://www.haskell.org/ghc/ :? for help > Loading package ghc-prim ... linking ... done. > Loading package integer-gmp ... linking ... done. > Loading package base ... linking ... done. > Loading package ffi-1.0 ... linking ... done. > Prelude> :m +Data.IORef Control.Concurrent Control.Monad > Prelude Data.IORef Control.Concurrent Control.Monad> msg <- newIORef > "Hello" > Prelude Data.IORef Control.Concurrent Control.Monad> let echo = > forever $ readIORef msg >>= putStrLn >> threadDelay 3000000 > Prelude Data.IORef Control.Concurrent Control.Monad> t <- forkIO echo > Hello > Prelude Data.IORef Control.Concurrent Control.Monad> Hello > Hello > writeIORefHello msg "World" > Prelude Data.IORef Control.Concurrent Control.Monad> World > World >
Thanks ... this is the possibility I was looking for. Btw, I am thinking I'd need to use STM to synchronize right? Regards, Kashyap
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