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,
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
Datum: 24. 12. 2012 Předmět: Re: [Haskell-cafe] multi-thread and lazy evaluation
On Mon, 2012-12-24 at 16:16 +0100, timothyhobbs@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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