Tim Newsham <news...@lava.net> wrote in article 
<pine.bsi.4.64.0906051510070.14...@malasada.lava.net> in 
gmane.comp.lang.haskell.cafe:
> his language also 
> supports an interesting imperative primitive that lets you pick the first 
> available value from a set of channels which isn't available in pure 
> Haskell expressions.  Has anyone implemented a primitive like this for 
> Haskell?

Could it be the "amb" described at
    http://conal.net/blog/posts/functional-concurrency-with-unambiguous-choice/
    http://conal.net/blog/posts/smarter-termination-for-thread-racing/
?

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