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Within LTS Haskell 24.65 (ghc-9.10.3)
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castForeignPtr :: ForeignPtr a -> ForeignPtr bghc-internal GHC.Internal.Foreign.ForeignPtr.Imp This function casts a ForeignPtr parameterised by one type into another type.
finalizeForeignPtr :: ForeignPtr a -> IO ()ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp Causes the finalizers associated with a foreign pointer to be run immediately. The foreign pointer must not be used again after this function is called. If the foreign pointer does not support finalizers, this is a no-op.
mallocForeignPtr :: Storable a => IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp Allocate some memory and return a ForeignPtr to it. The memory will be released automatically when the ForeignPtr is discarded. mallocForeignPtr is equivalent to
do { p <- malloc; newForeignPtr finalizerFree p }although it may be implemented differently internally: you may not assume that the memory returned by mallocForeignPtr has been allocated with malloc. GHC notes: mallocForeignPtr has a heavily optimised implementation in GHC. It uses pinned memory in the garbage collected heap, so the ForeignPtr does not require a finalizer to free the memory. Use of mallocForeignPtr and associated functions is strongly recommended in preference to newForeignPtr with a finalizer.mallocForeignPtrArray :: Storable a => Int -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp This function is similar to mallocArray, but yields a memory area that has a finalizer attached that releases the memory area. As with mallocForeignPtr, it is not guaranteed that the block of memory was allocated by malloc.
mallocForeignPtrArray0 :: Storable a => Int -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp This function is similar to mallocArray0, but yields a memory area that has a finalizer attached that releases the memory area. As with mallocForeignPtr, it is not guaranteed that the block of memory was allocated by malloc.
mallocForeignPtrBytes :: Int -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp This function is similar to mallocForeignPtr, except that the size of the memory required is given explicitly as a number of bytes.
newForeignPtr :: FinalizerPtr a -> Ptr a -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp Turns a plain memory reference into a foreign pointer, and associates a finalizer with the reference. The finalizer will be executed after the last reference to the foreign object is dropped. There is no guarantee of promptness, however the finalizer will be executed before the program exits.
newForeignPtrEnv :: FinalizerEnvPtr env a -> Ptr env -> Ptr a -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp This variant of newForeignPtr adds a finalizer that expects an environment in addition to the finalized pointer. The environment that will be passed to the finalizer is fixed by the second argument to newForeignPtrEnv.
newForeignPtr_ :: Ptr a -> IO (ForeignPtr a)ghc-internal GHC.Internal.Foreign.ForeignPtr.Imp Turns a plain memory reference into a foreign pointer that may be associated with finalizers by using addForeignPtrFinalizer.
plusForeignPtr :: ForeignPtr a -> Int -> ForeignPtr bghc-internal GHC.Internal.Foreign.ForeignPtr.Imp Advances the given address by the given offset in bytes. The new ForeignPtr shares the finalizer of the original, equivalent from a finalization standpoint to just creating another reference to the original. That is, the finalizer will not be called before the new ForeignPtr is unreachable, nor will it be called an additional time due to this call, and the finalizer will be called with the same address that it would have had this call not happened, *not* the new address.