Re: WIP 2 interpreters for plperl

I wrote:
>
> I have made some progress with what I think is needed to have two
> interpreters for plperl. This is a lot harder than the pltcl case for
> two reasons: 1. there are no restrictions on having 2 tcl
> interpreters, and 2. tcl does not need to save and restore context as
> we have to do with perl. I think I have a conceptual siolution to
> these two problems, but what I have is currently segfaulting somewhat
> myteriously. Tracing a dynamically loaded library in a postgres
> backend with a debugger is less than fun, too. I am attaching what I
> currently have, liberally sprinkled with elog(NOTICE) calls as trace
> writes.
>
>

With a little more perseverance I found the problem. The attached patch
passes regression. But it now needs plenty of eyeballs and testing.

cheers

andrew