Robert Haas <robertmh...@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 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers