Hi all,
I would like to attach finalizer (written in Haskell) to some pointer. When the pointer won't be needed any more, finalizer should run. So here is the code:
module Main where import Foreign.Ptr import Foreign.ForeignPtr import Foreign.Marshal.Alloc
foreign import stdcall "wrapper" mkFin :: (Ptr a -> IO ()) -> IO (FunPtr (Ptr a -> IO ()))
finDoIt ptr = putStrLn "My finalizer"
mkFinalizer = mkFin finDoIt
main = do
(ptr :: Ptr Int) <- malloc
myFin <- mkFinalizer
finptr <- newForeignPtr myFin ptr
putStrLn "End of script"
This script ends with following output:
$ ./finalizers End of script
Fail: <<loop>>
Also it seems to me that I'm not freeing finalizer stub. Is this code leaking memory?
How do I attach finalizer to object in the heap?
-- Pozdrawiam, Regards, Gracjan
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