From 8d56ace2edb80778379526bfe8add3b093c7618d Mon Sep 17 00:00:00 2001
From: Miek Gieben <miek@miek.nl>
Date: Sat, 25 Aug 2012 22:12:29 +0200
Subject: [PATCH] read locking

---
 zone.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/zone.go b/zone.go
index 077c77a8..eaa244e9 100644
--- a/zone.go
+++ b/zone.go
@@ -154,6 +154,8 @@ func (z *Zone) Remove(r RR) error {
 // Find looks up the ownername s in the zone and returns the
 // data when found or nil when nothing is found.
 func (z *Zone) Find(s string) *ZoneData {
+	z.mutex.RLock()
+	defer z.mutex.RUnlock()
 	zd := z.Radix.Find(toRadixName(s))
 	if zd == nil {
 		return nil
@@ -163,6 +165,8 @@ func (z *Zone) Find(s string) *ZoneData {
 
 // Predecessor searches the zone for a name shorter than s.
 func (z *Zone) Predecessor(s string) *ZoneData {
+	z.mutex.RLock()
+	defer z.mutex.RUnlock()
 	zd := z.Radix.Predecessor(toRadixName(s))
 	if zd == nil {
 		return nil