Fix spinlock implementation for some !solaris sparc platforms. Some Sparc CPUs can be run in various coherence models, ranging from RMO (relaxed) over PSO (partial) to TSO (total). Solaris has always run CPUs in TSO mode while in userland, but linux didn't use to and the various *BSDs still don't. Unfortunately the sparc TAS/S_UNLOCK were only correct under TSO. Fix that by adding the necessary memory barrier instructions. On sparcv8+, which should be all relevant CPUs, these are treated as NOPs if the current consistency model doesn't require the barriers.
Discussion: [email protected] Will be backpatched to all released branches once a few buildfarm cycles haven't shown up problems. As I've no access to sparc, this is blindly written. Branch ------ REL9_0_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/f25e896016f5360df48fe7bfdb41c62494dc1277 Modified Files -------------- src/backend/port/tas/sunstudio_sparc.s | 2 ++ src/include/storage/s_lock.h | 50 ++++++++++++++++++++++++++++++-- 2 files changed, 50 insertions(+), 2 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
