[COMMITTERS] pgsql: Impose a full barrier in generic-xlc.h atomics functions.
Impose a full barrier in generic-xlc.h atomics functions. pg_atomic_compare_exchange_*_impl() were providing only the semantics of an acquire barrier. Buildfarm members hornet and mandrill revealed this deficit beginning with commit 008608b9d51061b1f598c197477b3dc7be9c4a64. While we have no report of symptoms in 9.5, we can't rule out the possibility of certain compilers, hardware, or extension code relying on these functions' specified barrier semantics. Back-patch to 9.5, where commit b64d92f1a5602c55ee8b27a7ac474f03b7aee340 introduced atomics. Reviewed by Andres Freund. Branch -- REL9_5_STABLE Details --- http://git.postgresql.org/pg/commitdiff/f9989482d0a24cd69f574b805db770980603a5ca Modified Files -- src/include/port/atomics/generic-xlc.h | 26 ++ 1 file changed, 22 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Impose a full barrier in generic-xlc.h atomics functions.
Impose a full barrier in generic-xlc.h atomics functions. pg_atomic_compare_exchange_*_impl() were providing only the semantics of an acquire barrier. Buildfarm members hornet and mandrill revealed this deficit beginning with commit 008608b9d51061b1f598c197477b3dc7be9c4a64. While we have no report of symptoms in 9.5, we can't rule out the possibility of certain compilers, hardware, or extension code relying on these functions' specified barrier semantics. Back-patch to 9.5, where commit b64d92f1a5602c55ee8b27a7ac474f03b7aee340 introduced atomics. Reviewed by Andres Freund. Branch -- master Details --- http://git.postgresql.org/pg/commitdiff/213c7df0337278c71c98e90605dc83023db1a80e Modified Files -- src/include/port/atomics/generic-xlc.h | 26 ++ 1 file changed, 22 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
