On Thu, Jun 08, 2023 at 10:57:55AM +0900, Masahiro Ikeda wrote: > (Excuse me for cutting in, and this is not directly related to the thread.) > +1. I'm interested in the feature. > > This is just a example and it probable be useful for other users. IMO, at > least, it's better to improve the specification that "Extension" > wait event type has only the "Extension" wait event.
I hope that nobody would counter-argue you here. In my opinion, we should just introduce an API that allows extensions to retrieve wait event numbers that are allocated by the backend under PG_WAIT_EXTENSION, in a fashion similar to GetNamedLWLockTranche(). Say something like: int GetExtensionWaitEvent(const char *wait_event_name); I don't quite see a design where extensions could rely on their own numbers statically assigned by the extension maintainers, as this is most likely going to cause conflicts. And I would guess that a lot of external code would want to get more data pushed to pg_stat_activity, meaning a lot of conflicts, potentially. -- Michael
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