Andres Freund <and...@anarazel.de> writes: > Hm. After a long battle of head vs. wall I think I see what the problem > is. For the fallback atomics implementation I somehow had assumed that > pg_atomic_write_u32() doesn't need to lock, as it's just an unlocked > write. But that's not true, because it has to cause > pg_atomic_compare_exchange_u32 to fail.
Hah ... obvious once you see it. > For me the problem often takes a lot longer to reproduce (once only > after 40min), could you run with the attached patch, and see whether > that fixes things for you? For me, with the described test case, HEAD fails within a minute, two times out of three or so. I've not reproduced it after half an hour of beating on this patch. Looks good. 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