module Callback:sig
..end
This module allows OCaml values to be registered with the C runtime
under a symbolic name, so that C code can later call back registered
OCaml functions, or raise registered OCaml exceptions.
val register : string -> 'a -> unit
Callback.register n v
registers the value v
under
the name n
. C code can later retrieve a handle to v
by calling caml_named_value(n)
.val register_exception : string -> exn -> unit
Callback.register_exception n exn
registers the
exception contained in the exception value exn
under the name n
. C code can later retrieve a handle to
the exception by calling caml_named_value(n)
. The exception
value thus obtained is suitable for passing as first argument
to raise_constant
or raise_with_arg
.