Initialising caml values from C

[Jonathan Roewen <jonathan.roewen@gmail.com>]

Hi,

I'm building an ocaml-native program (actually an OS). Anyways, I
initialise the ocaml runtime from C, but the problem I have is that I
want a couple of caml values to be initialised by calling into C-land.

Something like: (lfb is a linear frame buffer)

external get_lfb: unit -> (int32, Bigarray.int32_elt,
Bigarray.c_layout) Bigarray.Array2.t = "get_lfb"

(* the part that doesn't seem to work *)

(* create a cairo instance for drawing into the LFB *)
let cairo = Cairo.create ()
(* gets the LFB, makes it into a cairo image, then sets it as surface
   for cairo to draw into *)
let _ = Cairo.set_target_image cairo (of_bigarr_32 true (get_lfb ()))

If I instead call some initialiser functions to set up the cairo
instances, it seems to be okay... but it'd make life a lot easier if
the above would work correctly. It'd especially help with other parts
of the code that use the above (and other functions/values).

Jon