[Haskell-cafe] FFI nested structs - malloc - free
mike at proclivis.com
Tue May 5 03:45:40 UTC 2015
I should have mentioned GHC 7.8.3 Ubuntu 64bit
Sent from my iPad
> On May 4, 2015, at 9:42 PM, Proclivis <mike at proclivis.com> wrote:
> FFI Gurus,
> I created a c2hs FFI of a nested C structure, where struct A has a pointer to a struct B. To do so, I used a malloc, but I am unsure if the memory will be freed when the resulting Ptr is freed.
> The example at this link uses the same technique, so it will serve as an example.
> Line 48 and 51 do the malloc and assign the pointer in the struct, from inside a Storable poke implementation.
> But, there is no explicit free, nor a finalizer.
> Will the memory be freed when the Ptr of the Storable is freed?
> If it is, it implies that some magic keeps track of mallocs inside a poke, and creates finalizers. Or, this example leaks. If it leaks, how do I create a finalizer from inside a poke implementation?
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