On Sunday, June 30th, 2024 at 19:22, Gerd Möllmann <gerd.moellmann@gmail.com> wrote:
> Thanks! What do youo think about making a patch containing only your
> weak hash tables, and leaving the BUF_MARKERS alone for now?

I think that's the best way forward. Patch attached.

> That way
> igc could support the existing uses of weak hash tables (I remember one
> in the CLOS department somehwere), and they would be somewhat tested.
> Don't remember if we have unit tests for them.

It seems MPS isn't very eager about splatting weak references during ordinary automatic GC, FWIW. What I'm observing with

(while t
  (dotimes (i 10000)
    (puthash (cons 1 2) (cons 3 4) table))
  (message "%S" (hash-table-count table))
  (sit-for 0.1))

is that the hash table starts out at 0, grows quickly, resets to count=0 once, then keeps growing and never splats any references after that. It's quite possible this is a bug in my code, of course.

Pip