[Haskell-cafe] Re: Threading and FFI

Simon Marlow marlowsd at gmail.com
Mon Feb 22 09:17:48 EST 2010

On 20/02/2010 09:52, Maciej Piechotka wrote:
> Sorry I start spin-off of thread but all over the haskell code is idiom:
> throwErrorIfMinus1_ $ someCode args
> However this code is dependent on errno, which is thread dependent. Is
> GHC making sure that errno set from C call is propagated back into
> correct thread?

Yes, it is.

> Are there any requirements regarding safeness/unsafeness of such
> propagation

No there aren't.


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