[Haskell-cafe] multi-thread and lazy evaluation

[Corentin Dupont]

Great, with me compiled with ghc -threaded the bug shows up.
However, runnning "main" in ghci doesn't show the bug (it finishes
correctly).
I have GHC 7.4.1.

Corentin

On Tue, Dec 25, 2012 at 3:34 PM, <timothyhobbs at seznam.cz> wrote:

> This seems like a bug in GHC. But it has nothing to do with MVars.  I've
> narrowed this down and filed a bug report here:
>
> http://hackage.haskell.org/trac/ghc/ticket/7528
>
> Timothy
>
> ---------- Původní zpráva ----------
> Od: Yuras Shumovich <shumovichy at gmail.com>
>
> Datum: 24. 12. 2012
> Předmět: Re: [Haskell-cafe] multi-thread and lazy evaluation
>
>
> On Mon, 2012-12-24 at 16:16 +0100, timothyhobbs at seznam.cz wrote:
> > The real question is, does this mean that GHC is stopping the world
> every
> > time it puts an MVar?
>
> No, GHC rts only locks the MVar itself.
> See here:
> http://hackage.haskell.org/trac/ghc/browser/rts/PrimOps.cmm#L1358
>
> Yuras
>
>
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