The situation is that I never succeeded in working out how to make threads::shared share globs.

I got quite a long way towards that goal, but always found something that prevented my attempts from being completely successful, and did not know enough about the guts of Perl magic to be able to debug it when it went wrong. I remain convinced that if someone with the requisite skills could be recruited to spend a litte time trying, it could be achieved. But those with the requisite skills do not consider threads a high priority it seems. Which is a shame, because IMO, this is the single most limiting factor on the usefulness of threads in perl.

I do not have a clean alternative for you.