December 2003 - FFI - Haskell.org

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25 Dec '03

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23 Dec '03

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23 Dec '03

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RE: How to force finalization of ForeignPtr
by Simon Marlow 22 Dec '03

22 Dec '03

[ forwarded to ffi(a)haskell.org ] > In the current implementation there is no way to > force finalization of the foreign ptr if there are > still references to it. In this scenario > the finalization will be executed during the next > garbage collection. In some cases it is known that the > foreign pointer value is not used anymore but the > references still exist in the stack and they cannot be > freed from the collector. In such cases I want to be > able to explicitly finalize the foreign pointers. For > that reason I wrote the following simple function: > > module FinalizeForeignPtr(finalizeForeignPtr) where > > import GHC.ForeignPtr > import Data.IORef > > finalizeForeignPtr :: ForeignPtr a -> IO () > finalizeForeignPtr foreignPtr = do > finalizers <- readIORef refFinalizers > sequence_ finalizers > writeIORef refFinalizers [] > where > refFinalizers = case foreignPtr of > (ForeignPtr _ ref) -> ref > (MallocPtr _ ref) -> ref There's a race condition between multiple finalizeForeignPtrs, but apart from that it looks fine. I don't see any reason why we shouldn't have this. GHC's weak pointer interface has a similar function for running the finalizer early. Cheers, Simon _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users(a)haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users

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