Micro optimize LWLockAttemptLock() a bit. LWLockAttemptLock pointlessly read the lock's state in every loop iteration, even though pg_atomic_compare_exchange_u32() returns the old value. Instead do that only once before the loop iteration.
Additionally there's no need to have the expected_state variable, old_state mostly had the same value anyway. Noticed-By: Heikki Linnakangas Backpatch: 9.5, no reason to let the branches diverge at this point Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/a4b09af3e93707351f1d4b8efafabfa135c0f70b Modified Files -------------- src/backend/storage/lmgr/lwlock.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
