[Haskell-cafe] Extending GHCi

[Kashyap C]

  I tried a fresh install of Haskell platform on my Vista box and I find
that starting the thread does not return to the   prompt. Is there some
setting I need to do?

Sent from my Windows Phone
------------------------------
From: Steffen Schuldenzucker
Sent: Monday, 7 February 2011 6:46 PM
To: C K Kashyap
Cc: Haskell Cafe
Subject: Re: [Haskell-cafe] Extending GHCi

   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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