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diff --git a/nci/jni/Mutex.h b/nci/jni/Mutex.h
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+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*
+ *  Encapsulate a mutex for thread synchronization.
+ */
+
+#pragma once
+#include <pthread.h>
+
+
+class Mutex
+{
+public:
+    /*******************************************************************************
+    **
+    ** Function:        Mutex
+    **
+    ** Description:     Initialize member variables.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    Mutex ();
+
+
+    /*******************************************************************************
+    **
+    ** Function:        ~Mutex
+    **
+    ** Description:     Cleanup all resources.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~Mutex ();
+
+
+    /*******************************************************************************
+    **
+    ** Function:        lock
+    **
+    ** Description:     Block the thread and try lock the mutex.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void lock ();
+
+
+    /*******************************************************************************
+    **
+    ** Function:        unlock
+    **
+    ** Description:     Unlock a mutex to unblock a thread.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void unlock ();
+
+
+    /*******************************************************************************
+    **
+    ** Function:        tryLock
+    **
+    ** Description:     Try to lock the mutex.
+    **
+    ** Returns:         True if the mutex is locked.
+    **
+    *******************************************************************************/
+    bool tryLock ();
+
+
+    /*******************************************************************************
+    **
+    ** Function:        nativeHandle
+    **
+    ** Description:     Get the handle of the mutex.
+    **
+    ** Returns:         Handle of the mutex.
+    **
+    *******************************************************************************/
+    pthread_mutex_t* nativeHandle ();
+
+    class Autolock {
+        public:
+            inline Autolock(Mutex& mutex) : mLock(mutex)  { mLock.lock(); }
+            inline Autolock(Mutex* mutex) : mLock(*mutex) { mLock.lock(); }
+            inline ~Autolock() { mLock.unlock(); }
+        private:
+            Mutex& mLock;
+    };
+
+
+private:
+    pthread_mutex_t mMutex;
+};
+
+typedef Mutex::Autolock AutoMutex;