Re: Allow logical failover slots to wait on synchronous replication

Hi Bertrand,

> 1 ===
> ...
> That's worth additional comments in the code.

There's this comment already about caching the value already, not sure
if you prefer something more?

/* Cache values to reduce contention on lock */

> 2 ===
> ...
> Looks like setting initialized to true is missing once done.

Thanks, will update.

> 3 ===
> ...
> NUM_SYNC_REP_WAIT_MODE is small but as the goal is the keep the lock time as
> short as possible I wonder if it wouldn't be better to use memcpy() here instead
> of this for loop.
>

It results in a "Wdiscarded-qualifiers" which is safe given we take
the lock, but adds noise?
What do you think?

"slot.c:2756:46: warning: passing argument 2 of ‘memcpy’ discards
‘volatile’ qualifier from pointer target type
[-Wdiscarded-qualifiers]"

Thanks,

--
John Hsu - Amazon Web Services