[Haskell-cafe] STM, orElse and timed read from a channel

[Joel Reymont]

Simon,

How is this easier than just calling threadDelay?

Ideally, I would be looking for something like reading from a TVar  
with a timeout. So that you either get a Nothing (timeout) or the  
value from the TVar. Can I implement it using the GHC timeout thread?

	Thanks, Joel

On Nov 29, 2005, at 9:20 AM, Simon Marlow wrote:

> Interestingly, GHC already has a timeout thread - the I/O manager  
> thread
> handles threadDelay too.  It wouldn't be too hard to adapt it to do  
> STM
> timeouts too, with a function like
>
>    registerTimeout :: Int -> STM (TVar Bool)
>
> and you wait for your timeout by waiting for the TVar to contain True.

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