From df02a2011b7e7ad44970c5131498a8b085c47fc7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Witold=20Kr=C4=99cicki?= <wpk@isc.org>
Date: Mon, 24 Feb 2020 19:02:15 +0100
Subject: [PATCH] pthread_yield in rbtdb

---
 lib/dns/rbtdb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
index 10706b4aa0..c5123748ad 100644
--- a/lib/dns/rbtdb.c
+++ b/lib/dns/rbtdb.c
@@ -2808,6 +2808,7 @@ findnodeintree(dns_rbtdb_t *rbtdb, dns_rbt_t *tree, const dns_name_t *name,
 		 * unlocking then relocking.
 		 */
 		__sync_synchronize();
+		pthread_yield();
 		locktype = isc_rwlocktype_write;
 		RWLOCK(&rbtdb->tree_lock, locktype);
 		node = NULL;