Robert Haas <robertmhaas@gmail.com> writes:
> Of course, it would be nice if we could make these counters 64-bit
> integers, but we can't, because we don't rely on 64-bit reads and
> writes to be atomic on all platforms. So instead they'll have to be
> uint32. That means they could wrap (if you really work at it) but
> subtraction will still return the right answer, so it's OK.
OK ...
> If we
> want to allow the number of parallel workers started to be available
> for statistical purposes, we can keep to uint32 values for that
> (parallel_register_count_lo and parallel_register_count_hi, for
> example), and increment the second one whenever the first one rolls
> over to zero.
And that's going to be atomic how exactly?
regards, tom lane