[Haskell-cafe] Extending GHCi

[Steffen Schuldenzucker]

On 02/07/2011 12:45 PM, C K Kashyap wrote:
>
>
>     $ 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
>
>
> On my mac, this works..but on Linux, the moment I do t <- forkIO ... , 
> it starts off a thread in the foreground and does not return to the 
> prompt.
Strange. Works for me (ghc 6.12.1 on Debian squeeze).

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