From: Mathieu Avila <mavila@irisa.fr>

> >I'm using ocaml on Solaris8/x86, and many C libraries, with no
> >problem.
> >
> Are you able to call the ocaml code from the C ? I think this is rather 
> different from calling C libs from a standalone OCaml code.

If you mean calling callback, I can. My libraries are full of
callbacks from C to caml.

> In my case, i mix the 2 langages in this way :
> 
> cmain.ml:
> --------------------------------------------------------
> let cmain_ocaml n = try
> ...
> ;;
> 
> let _ = Callback.register "cmain_ocaml" cmain_ocaml
> --------------------------------------------------------
> 
> in a cmain_cpp.cpp , where there is the "real" main() function:
> --------------------------------------------------------
>  static value * cmain_closure = NULL;
>  if (cmain_closure==NULL)
>    cmain_closure = caml_named_value("cmain_ocaml");
>  result = Int_val(callback(*cmain_closure,Val_int(n)));
> --------------------------------------------------------
> 
> It crashses when calling :  callback(*cmain_closure...)
> 
> All is compiled into native solaris object code.
> The same thing works perfectly on solaris/sparc.

Do I understand correctly than the C code above is inside the main
function?
Then I cannot see how it would work. Callback.register dynamically
adds "cmain_ocaml" to a table of known functions. If you don't call
ocaml's main function (i.e. the main() function of the ocaml C
runtime, or at least caml_main()), your caml function will not be
registered and this should not work.

Jacques Garrigue

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