From d6fb8ce05acce3bedf0b59995bf666ee78febe96 Mon Sep 17 00:00:00 2001
From: Mike Danese <mikedanese@gmail.com>
Date: Sun, 22 Feb 2015 14:35:53 -0800
Subject: [PATCH] Don't lock readinessStates on concurrent reads.

---
 pkg/kubelet/probe.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/pkg/kubelet/probe.go b/pkg/kubelet/probe.go
index 382b6f4da45..75cab23604a 100644
--- a/pkg/kubelet/probe.go
+++ b/pkg/kubelet/probe.go
@@ -162,7 +162,8 @@ func newReadinessStates() *readinessStates {
 }
 
 type readinessStates struct {
-	sync.Mutex
+	// guards states
+	sync.RWMutex
 	states map[string]bool
 }
 
@@ -174,8 +175,8 @@ func (r *readinessStates) IsReady(c api.ContainerStatus) bool {
 }
 
 func (r *readinessStates) get(key string) bool {
-	r.Lock()
-	defer r.Unlock()
+	r.RLock()
+	defer r.RUnlock()
 	state, found := r.states[key]
 	return state && found
 }