Thank you Duncan for your example. I will also read the RSA code.
Regards, Vasili
On Sun, Jul 20, 2008 at 6:51 AM, Duncan Coutts
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