On Mon, Nov 24, 2025 at 04:02:18PM -0500, Robert Haas wrote:
> I haven't done a full review of this and I'm not sure whether you want
> me to spend more time on it...
I'd appreciate an eyeball check if you have the time.
> I'm guessing that the reason why that doesn't easily work is
> because you're relying on those locks to prevent multiple backends
> from doing the same initialization?
For GetNamedDSMSegment(), I bet we could avoid needing a PG_CATCH by taking
the DSMRegistryLock exclusively when accessing the registry. But for
GetNamedDSA() and GetNamedDSHash(), we want to keep the half-initialized
entry so that we don't leak LWLock tranche IDs. I initially thought that
might be okay, but if every backend is retrying, you could quickly run out
of tranche IDs.
--
nathan