Re: Support to define custom wait events for extensions

On Mon, Jul 31, 2023 at 12:58 PM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
>
> Attaching a v11 based on Bharath's feedback and yours, for now. I
> have also applied the addition of the two masking variables in
> wait_event.c separately with 7395a90.

+uint32 WaitEventExtensionNew(void)
+</programlisting>
+ Next, each process needs to associate the wait event allocated previously
+ to a user-facing custom string, which is something done by calling:
+<programlisting>
+void WaitEventExtensionRegisterName(uint32 wait_event_info, const
char *wait_event_name)
+</programlisting>
+ An example can be found in
<filename>src/test/modules/worker_spi</filename>
+ in the PostgreSQL source tree.
+ </para>

Do you think it's worth adding a note here in the docs about an
external module defining more than one custom wait event? A pseudo
code if possible or just a note? Also, how about a XXX comment atop
WaitEventExtensionNew and/or WaitEventExtensionRegisterName on the
possibility of extending the functions to support allocation of more
than one custom wait events?

--
Bharath Rupireddy
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com