[Haskell-cafe] Top-level TVars

[Tomasz Zielonka]

On Tue, Dec 13, 2005 at 06:08:23PM +0000, Joel Reymont wrote:
> Can this be done now or is this a GHC 6.5 feature?
> 
> My combination of unsafePerformIO with atomically $ newTVar does not  
> seem to be working.

Here is an example how you can initialize a top-level STM variable.
    http://www.uncurry.com/repos/TimeVar/TimeVar.hs
It just forks a new thread inside unsafePerformIO, it runs "atomically"
in it and passes the result through ordinary MVar.

Best regards
Tomasz

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