--- /dev/null
+// Copyright (C) 2014 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.
+
+#ifndef EMUGL_MUTEX_H
+#define EMUGL_MUTEX_H
+
+#ifdef _WIN32
+# define WIN32_LEAN_AND_MEAN 1
+# include <windows.h>
+#else
+# include <pthread.h>
+#endif
+
+namespace emugl {
+
+class ConditionVariable;
+
+// Simple wrapper class for mutexes.
+class Mutex {
+public:
+ // Constructor.
+ Mutex() {
+#ifdef _WIN32
+ ::InitializeCriticalSection(&mLock);
+#else
+ ::pthread_mutex_init(&mLock, NULL);
+#endif
+ }
+
+ // Destructor.
+ ~Mutex() {
+#ifdef _WIN32
+ ::DeleteCriticalSection(&mLock);
+#else
+ ::pthread_mutex_destroy(&mLock);
+#endif
+ }
+
+ // Acquire the mutex.
+ void lock() {
+#ifdef _WIN32
+ ::EnterCriticalSection(&mLock);
+#else
+ ::pthread_mutex_lock(&mLock);
+#endif
+ }
+
+ // Release the mutex.
+ void unlock() {
+#ifdef _WIN32
+ ::LeaveCriticalSection(&mLock);
+#else
+ ::pthread_mutex_unlock(&mLock);
+#endif
+ }
+
+ // Helper class to lock / unlock a mutex automatically on scope
+ // entry and exit.
+ class AutoLock {
+ public:
+ AutoLock(Mutex& mutex) : mMutex(&mutex) {
+ mMutex->lock();
+ }
+
+ ~AutoLock() {
+ mMutex->unlock();
+ }
+ private:
+ Mutex* mMutex;
+ };
+
+private:
+#ifdef _WIN32
+ CRITICAL_SECTION mLock;
+#else
+ friend class ConditionVariable;
+ pthread_mutex_t mLock;
+#endif
+
+};
+
+} // namespace emugl
+
+#endif // EMUGL_MUTEX_H