ANNOUNCE: GHC 6.10.2 Release Candidate 1

[Bulat Ziganshin]

Hello Don,

Friday, March 20, 2009, 2:34:09 AM, you wrote:

the question is wider - how many other programs already used this
behavior? it may be asked on main haskell list. what is the cost of
reverting it back for 6.10.*? 


> We must have the gtk2hs team invovled in this discussion. They were
> using an undocumented feature. It may be trivial to fix.

> --Don

> jnf:
>> 
>> Hello Simon,
>> I've put a request about the issue on the gtk2hs users mailing list:
>> 
>> > I've tried a gtk2hs app on ghc 6.10.2 release candidate.
>> > It crashes frequently and Simon (as you can read down here) assumes it
>> > is gtk2hs problem.
>> > My question is:
>> >        Is this problem known to gtk2hs developers?
>> >        Is it really a gtk2hs problem?
>> >        How difficult is it to fix the problem?
>> >        When will we have a patch to use gtk2hs with 6.10.2, 
>> >                is it already in the repo?      
>> 
>> However, I'm a little surprised that a little version upgrade from 6.10.1 to
>> 6.10.2 may break all gui apps based on gtk2hs. May it be that many more apps
>> are affected because of this change? What's about wxhaskell e.g.? Well,
>> maybe we have only few Haskell applications around, but usually I
>> wouldn't expect such a dramatic effect from such a moderate upgrade. Is this
>> fix so important to introduce it now? What does it help when it was never
>> officially supported if it causes such troubles?
>> 
>> Jürgen  
>>  
>> 
>> 
>> Simon Marlow-7 wrote:
>> > 
>> > jutaro wrote:
>> >> I've installed a GUI application based on gtk2hs.
>> >>         
>> >> It frequently crashes with the error: 
>> >> leksah: error: a C finalizer called back into Haskell.
>> >> use Foreign.Concurrent.newForeignPtr for Haskell finalizers.
>> >> 
>> >> This error did never occur with the 6.10 released version. It was
>> >> verified
>> >> that this happens on different machines. I've no idea how to isolate this
>> >> bug.
>> > 
>> > This will need to be fixed in gtk2hs.  Previously GHC allowed finalizers
>> > to 
>> > call back into Haskell, but this was never officially supported.  Now it
>> > is 
>> > officially unsupported, because finalizers created via
>> > Foreign.mkForeignPtr 
>> > are run directly by the garbage collector.
>> > 
>> > See
>> > 
>> >   http://hackage.haskell.org/trac/ghc/ticket/1364
>> > 
>> > Cheers,
>> >     Simon
>> > _______________________________________________
>> > Glasgow-haskell-users mailing list
>> > Glasgow-haskell-users at haskell.org
>> > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
>> > 
>> > 
>> 
>> -- 
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>> Sent from the Haskell - Glasgow-haskell-users mailing list archive at Nabble.com.
>> 
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-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com