Comment author: administrator

it seems custom finalisation only happens during
a sweep of the major heap.

Correct.

if this is so then surely alloc_custom must not
allocate from the minor heap?

If you look at the source of alloc_custom, you'll see that allocation
is performed in the minor heap only if there is no finalization
function in the custom_operations struct.

i have observed custom blocks in the minor heap not
being finalised when they go 'out of scope' before
the next minor collection.

There should never be a custom block with non-NULL finalizer in the
minor heap. If you've observed this, please give us more details so
that we can track this bug down.

Cheers,

• Xavier Leroy

Comment author: administrator

Can't reproduce.