[dpdk-dev] [PATCH v9 3/5] mcslock: use wait until scheme for mcslock
From: Feifei Wang <hidden>
Date: 2021-11-01 06:00:41
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Instead of polling for mcslock to be updated, use wait until scheme for this case. Signed-off-by: Feifei Wang <redacted> Reviewed-by: Ruifeng Wang <redacted> Acked-by: Jerin Jacob <redacted> --- lib/eal/include/generic/rte_mcslock.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/eal/include/generic/rte_mcslock.h b/lib/eal/include/generic/rte_mcslock.h
index 34f33c64a5..753836d23c 100644
--- a/lib/eal/include/generic/rte_mcslock.h
+++ b/lib/eal/include/generic/rte_mcslock.h@@ -116,8 +116,9 @@ rte_mcslock_unlock(rte_mcslock_t **msl, rte_mcslock_t *me) /* More nodes added to the queue by other CPUs. * Wait until the next pointer is set. */ - while (__atomic_load_n(&me->next, __ATOMIC_RELAXED) == NULL) - rte_pause(); + uintptr_t *next; + next = (uintptr_t *)&me->next; + RTE_WAIT_UNTIL_MASKED(next, UINTPTR_MAX, !=, 0, __ATOMIC_RELAXED); } /* Pass lock to next waiter. */
--
2.25.1