> The other complication I can see is that ForeignPtr finalisers can't
> be Haskell. So I have to call the Haskell finalisation from C.
> Is that safe? I'm afraid I still don't fully understand why Haskell
> finalisers are unsafe or why (if) calling Haskell from a C finaliser
> (which then called C land again) would be any safer.
If you don't mind your code being non-portable, then Foreign.Concurrent
provides Haskell finalisers. This support will be available only on
Haskell implementations which implement pre-emptive concurrency (i.e.
just GHC for now).
Cheers,
Simon
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