[Caml-list] hook before gc major collections

[Damien Pous <Damien.Pous@inria.fr>]

Hello,

Is there a way to register a function, to be called before each gc
major collection ?
(I have some cache tables which I'd like to empty from time to time -
I'm not sure this is a good idea, but I would like to experiment it.)

I see two related functions in the std lib, but not the precise thing I want:
- Gc.create_alarm, to register a function to be called *after* such
collections ;
- Gc.finalise, which I could use with a dummy heap allocated value,
but then I guess my function would be called before any gc *minor*
collection, which is certainly too often in my concrete use-case.

Thanks in advance,
Damien