[Haskell-cafe] Misleading MVar documentation

Don Stewart dons at galois.com
Sat Dec 25 02:45:51 CET 2010

> Merry Christmas all!
> Is it just me, or does the Control.Concurrent.MVar documentation seem a bit
> misleading?  In particular, we should explicitly note the race conditions
> for not just swapMVar but also readMVar, withMVar, modifyMVar_ and modifyMVar,
> and clarify that the safety guarantees of the latter three pertain to their
> handling of asynchronous exceptions.
> It might also be good to tell people that if they need race-free operations
> of this style, STM is a good alternative to look at, even if only one variable
> is being synchronized over.

That would be a good contribution.

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