Hello, Andrey.
> Write barrier must be issued after write, not before.
> Don't we need to issue read barrier too?
The write barrier is issued after the changes to KnownAssignedXidsNext
and KnownAssignedXidsValid arrays and before the update of
headKnownAssignedXids.
So, it seems to be correct. We make sure once the CPU sees changes of
headKnownAssignedXids - underlying arrays contain all the required
data.
Thanks,
Michail.
