Re: [Gtk2hs-users] Finalizer problems with ghc 6.10.2

[Axel S. <Axe...@en...>]

On Wed, 2009-03-25 at 15:34 +0000, Simon Marlow wrote:

> > So assuming I would like to use the new interface that is hiding behind
> > the old function names, are there C functions to free a Haskell
> > StablePtr and a FunPtr that I can call from within the C finalizer that
> > the GC calls?
> 
> extern void hs_free_stable_ptr (HsStablePtr sp);
> extern void hs_free_fun_ptr    (HsFunPtr fp);
> 
> They're part of the standard FFI.

Yes, ok. I guess I mainly wanted to know if they can be called from
within a C finalizer.

Final question: if I'd free a Haskell function pointer using these C
functions, their closure is not going to be collected before the next
GC, right? Thus, there's no real benefit in using this API to free C
structures that hold pointers to Haskell land since it always takes at
least n garbage collections to collect chains with n Haskell->C->Haskell
pointer chains.

Axel.