HI Gracjan,
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:
import Foreign.ForeignPtr
I couldn't get finalisers to work either with the newForeignPtr from this module. I didn't know how to create a proper FunPtr. In Foreign.Concurrent there is a newForeignPtr that is easier to use:
newForeignPtr :: Ptr a -> IO () -> IO (ForeignPtr a)
This one worked beautifully for me. In your code something like:
import Foreign.ForeignPtr hiding (newForeignPtr) import Foreign.Concurrent
... fptr <- newForeignPtr ptr (finDoIt ptr)
Hope this helps, Arjan
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