[dpdk-dev] [RFC PATCH v1 3/5] eal: use wait until scheme for mcslock

[Feifei Wang]

Instead of polling for mcslock to be updated, use wait_until_unequal
for this case.

Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
---
 lib/eal/include/generic/rte_mcslock.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/eal/include/generic/rte_mcslock.h b/lib/eal/include/generic/rte_mcslock.h
index 9f323bd2a2..dabad0d4e0 100644
--- a/lib/eal/include/generic/rte_mcslock.h
+++ b/lib/eal/include/generic/rte_mcslock.h
@@ -117,8 +117,13 @@ 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();
+#ifdef RTE_ARCH_32
+		rte_wait_until_unequal_32((volatile uint32_t *)&me->next,
+				0, __ATOMIC_RELAXED);
+#else
+		rte_wait_until_unequal_64((volatile uint64_t *)&me->next,
+				0, __ATOMIC_RELAXED);
+#endif
 	}
 
 	/* Pass lock to next waiter. */
-- 
2.25.1