Re: GUC thread-safety approaches

On 18.11.25 15:15, Heikki Linnakangas wrote:
> PS. I found this blog post on how Thread Local Storage is implemented on
> different systems very enlightening: https://maskray.me/blog/2021-02-14-
> all-about-thread-local-storage. I think whatever scheme we come up with
> will be a home-grown implementation of one the methods described in that
> article.

I read this:

> Windows TLS

> Referencing a TLS variable from another DLL is not supported.
>
> __declspec(dllimport) extern thread_local int tls;
> // error C2492: 'tls': data with thread storage duration may not have
dll interface

So something like

extern PGDLLIMPORT thread_local struct Port *MyProcPort;

wouldn't work (confirmed).

That might be a problem, since we now mark all global variables as
PGDLLIMPORT.