[Haskell-cafe] no sparks?
felipe.lessa at gmail.com
Sun Dec 20 19:00:10 EST 2009
On Mon, Dec 21, 2009 at 12:39:06AM +0100, Daniel Fischer wrote:
> Am Sonntag 20 Dezember 2009 23:25:02 schrieb Jamie Morgenstern:
> > Also, I was wondering if something akin to a "parallel or" exists. By this,
> > I mean I am looking for a function which, given x : a , y : a, returns
> > either, whichever computation returns first.
> This wouldn't be easy to reconcile with referential transparency.
> You can do that in IO, roughly
> m <- newEmptyMVar
> t1 <- forkIO $ method1 >>= putMVar m
> t2 <- forkIO $ method2 >>= putMVar m
> rs <- takeMVar m
> killThread t1
> killThread t2
> return rs
> But in pure code, I think not.
There's 'unamb' in Hackage, however I think you should carefully
understand its implementation details before using it. Not that
I use it myself.
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