[Haskell-cafe] hugs segmentation fault
fjh-mailbox-24 at galois.com
Thu Oct 28 20:51:18 EDT 2004
On 29-Oct-2004, Ben Rudiak-Gould <Benjamin.Rudiak-Gould at cl.cam.ac.uk> wrote:
> Jon Fairbairn wrote:
> >On 2004-10-29 at 00:03BST Ben Rudiak-Gould wrote:
> >>Not much better, though: in my experience this particular
> >>exception leaves ghci in a very peculiar state, and it's
> >>usually necessary to quit and restart it before it will
> >>work again.
> >I don't think I've seen such a problem (maybe I so rarely
> >make that type of mistake?;-). What version? What are the
> >symptoms of this not working of which you speak? It seems
> >OK in ghci 6.2.1
We ran into a related problem recently. I think the problem may only
show up on Windows, not on Linux. The problem is that when a loop
occurs, ghc's garbage collection detects that the standard I/O handles
for stdin/stdout/stderr can no longer be referenced and finalizes them,
*before* detecting the loop and throwing an exception. Subsequent code
may then attempt to use these already-finalized standard I/O handles.
A possible work-around is to create stable pointers to those handles.
But I'm not sure whether this is the same problem that you are
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