Bulat Ziganshin wrote:
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 could revert it, but lots of people asked for this feature
(predictable finalizers), which is why we put it in 6.10.2.
The fix is fiarly easy: use Foreign.Concurrent.mkForeignPtr with a
foreign import.
Cheers,
Simon
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
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