On Sat, 2008-07-19 at 23:55 -0500, Galchin, Vasili wrote:
yes Duncan I am trying to pass-by-value. I am familiar with ForeignPtr; however, I don't comprehend what you and Brandon are suggesting to do. Could either of you provide a code illustration or point at existing code to illustrate your approach?
Take a look at John Meacham's RSA example. So at the moment you're using using Storable and a Haskell record, say: data AIOCB = AIOCB { ... } and we're suggesting instead: newtype AIOCB = AIOCB (ForeignPtr AIOCB) then to access a member use hsc2hs: getBlah :: AIOCB -> IO Blah getBlah (AIOCB fptr) = withForeignPtr fptr $ \ptr -> {# peek aiocb,blah #} ptr So you only access the parts you need and keep the aiocb C struct allocated on the heap (use mallocForeignPtr). Duncan