module Callback: sig .. end
Registering OCaml values with the C runtime.
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.
let 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)
.
let 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
.