diff --git a/CMakeLists_Headers.txt b/CMakeLists_Headers.txt
index e8c19eb0..0b736062 100644
--- a/CMakeLists_Headers.txt
+++ b/CMakeLists_Headers.txt
@@ -67,7 +67,6 @@ set(INCLUDE_HEADERS
 	src/manager/WFFacilities.inl
 	src/util/EncodeStream.h
 	src/util/LRUCache.h
-	src/util/Mutex.h
 	src/util/StringUtil.h
 	src/util/URIParser.h
 	src/util/MD5Util.h
diff --git a/src/manager/UpstreamManager.cc b/src/manager/UpstreamManager.cc
index 69fe0207..19721c1c 100644
--- a/src/manager/UpstreamManager.cc
+++ b/src/manager/UpstreamManager.cc
@@ -29,7 +29,6 @@
 #include <chrono>
 #include "list.h"
 #include "rbtree.h"
-#include "Mutex.h"
 #include "URIParser.h"
 #include "StringUtil.h"
 #include "EndpointParams.h"
@@ -39,6 +38,34 @@
 #define MTTR_SECOND			30
 #define VIRTUAL_GROUP_SIZE	16
 
+namespace //anoymous namespace, for safe, avoid conflict
+{
+// RAII: YES
+class ReadLock
+{
+public:
+	ReadLock(pthread_rwlock_t& rwlock): rwlock_(&rwlock) { pthread_rwlock_rdlock(rwlock_); }
+	ReadLock(pthread_rwlock_t *rwlock): rwlock_(rwlock) { pthread_rwlock_rdlock(rwlock_); }
+	~ReadLock() { pthread_rwlock_unlock(rwlock_); }
+
+private:
+	pthread_rwlock_t *rwlock_;
+};
+
+// RAII: YES
+class WriteLock
+{
+public:
+	WriteLock(pthread_rwlock_t& rwlock): rwlock_(&rwlock) { pthread_rwlock_wrlock(rwlock_); }
+	WriteLock(pthread_rwlock_t *rwlock): rwlock_(rwlock) { pthread_rwlock_wrlock(rwlock_); }
+	~WriteLock() { pthread_rwlock_unlock(rwlock_); }
+
+private:
+	pthread_rwlock_t *rwlock_;
+};
+
+}
+
 class UpstreamAddress;
 class UpstreamGroup;
 class Upstream;
diff --git a/src/manager/WFGlobal.cc b/src/manager/WFGlobal.cc
index 28977c29..7072ed31 100644
--- a/src/manager/WFGlobal.cc
+++ b/src/manager/WFGlobal.cc
@@ -36,7 +36,6 @@
 #include "DNSCache.h"
 #include "RouteManager.h"
 #include "Executor.h"
-#include "Mutex.h"
 #include "WFTask.h"
 #include "WFTaskError.h"
 
@@ -426,42 +425,48 @@ public:
 
 	ExecQueue *get_exec_queue(const std::string& queue_name)
 	{
-		ExecQueue *queue;
-		ExecQueueMap::iterator iter;
+		ExecQueue *queue = NULL;
 
+		pthread_rwlock_rdlock(&rwlock_);
+		const auto iter = queue_map_.find(queue_name);
+
+		if (iter != queue_map_.cend())
+			queue = iter->second;
+
+		pthread_rwlock_unlock(&rwlock_);
+
+		if (!queue)
 		{
-			ReadLock lock(mutex_);
-
-			iter = queue_map_.find(queue_name);
-			if (iter != queue_map_.end())
-				return iter->second;
-		}
-
-		queue = new ExecQueue();
-		if (queue->init() >= 0)
-		{
-			WriteLock lock(mutex_);
-			auto ret = queue_map_.emplace(queue_name, queue);
-
-			if (!ret.second)
+			queue = new ExecQueue();
+			if (queue->init() < 0)
 			{
-				queue->deinit();
 				delete queue;
-				queue = ret.first->second;
+				queue = NULL;
 			}
+			else
+			{
+				pthread_rwlock_wrlock(&rwlock_);
+				const auto ret = queue_map_.emplace(queue_name, queue);
 
-			return queue;
+				if (!ret.second)
+				{
+					queue->deinit();
+					delete queue;
+					queue = ret.first->second;
+				}
+
+				pthread_rwlock_unlock(&rwlock_);
+			}
 		}
 
-		delete queue;
-		return NULL;
+		return queue;
 	}
 
 	Executor *get_compute_executor() { return &compute_executor_; }
 
 private:
 	__ExecManager():
-		mutex_(PTHREAD_RWLOCK_INITIALIZER)
+		rwlock_(PTHREAD_RWLOCK_INITIALIZER)
 	{
 		int compute_threads = __WFGlobal::get_instance()->
 										  get_global_settings()->
@@ -486,7 +491,7 @@ private:
 	}
 
 private:
-	pthread_rwlock_t mutex_;
+	pthread_rwlock_t rwlock_;
 	ExecQueueMap queue_map_;
 	Executor compute_executor_;
 };
diff --git a/src/util/Mutex.h b/src/util/Mutex.h
deleted file mode 100644
index 6f120598..00000000
--- a/src/util/Mutex.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
-  Copyright (c) 2019 Sogou, Inc.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-  Authors: Wu Jiaxu (wujiaxu@sogou-inc.com)
-*/
-
-#ifndef _MUTEX_H_
-#define _MUTEX_H_
-
-#include <pthread.h>
-
-/**
- * @file   Mutex.h
- * @brief  RAII style pthread lock
- */
-
-// RAII: YES
-class Lock
-{
-public:
-	Lock(pthread_mutex_t& mutex): mutex_(&mutex) { pthread_mutex_lock(mutex_); }
-	Lock(pthread_mutex_t *mutex): mutex_(mutex) { pthread_mutex_lock(mutex_); }
-	~Lock() { pthread_mutex_unlock(mutex_); }
-
-private:
-	pthread_mutex_t *mutex_;
-};
-
-// RAII: YES
-class ReadLock
-{
-public:
-	ReadLock(pthread_rwlock_t& rwlock): rwlock_(&rwlock) { pthread_rwlock_rdlock(rwlock_); }
-	ReadLock(pthread_rwlock_t *rwlock): rwlock_(rwlock) { pthread_rwlock_rdlock(rwlock_); }
-	~ReadLock() { pthread_rwlock_unlock(rwlock_); }
-
-private:
-	pthread_rwlock_t *rwlock_;
-};
-
-// RAII: YES
-class WriteLock
-{
-public:
-	WriteLock(pthread_rwlock_t& rwlock): rwlock_(&rwlock) { pthread_rwlock_wrlock(rwlock_); }
-	WriteLock(pthread_rwlock_t *rwlock): rwlock_(rwlock) { pthread_rwlock_wrlock(rwlock_); }
-	~WriteLock() { pthread_rwlock_unlock(rwlock_); }
-
-private:
-	pthread_rwlock_t *rwlock_;
-};
-
-#endif
-