From c67aee701270c6ca1889c82be03ccbf010c1882b Mon Sep 17 00:00:00 2001
From: bluefoxah <bluefoxah@gmail.com>
Date: Mon, 11 Apr 2016 15:53:59 +0800
Subject: [PATCH] modify the lock

It seems that we did not use the feture of rwlock now.
delete the sync.Mutex only use sync.RWMutex.
---
 go/util/concurrent_read_map.go | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/go/util/concurrent_read_map.go b/go/util/concurrent_read_map.go
index 41cce8b82..ca1109f22 100644
--- a/go/util/concurrent_read_map.go
+++ b/go/util/concurrent_read_map.go
@@ -8,7 +8,6 @@ import (
 // initialize the map entries.
 type ConcurrentReadMap struct {
 	rmutex sync.RWMutex
-	mutex  sync.Mutex
 	Items  map[string]interface{}
 }
 
@@ -17,8 +16,8 @@ func NewConcurrentReadMap() *ConcurrentReadMap {
 }
 
 func (m *ConcurrentReadMap) initMapEntry(key string, newEntry func() interface{}) (value interface{}) {
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
+	m.rmutex.Lock()
+	defer m.rmutex.Unlock()
 	if value, ok := m.Items[key]; ok {
 		return value
 	}