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diff --git a/libs/hwui/thread/Barrier.h b/libs/hwui/thread/Barrier.h
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+++ b/libs/hwui/thread/Barrier.h
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+/*
+ * Copyright (C) 2013 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 ANDROID_HWUI_BARRIER_H
+#define ANDROID_HWUI_BARRIER_H
+
+#include <utils/Condition.h>
+
+namespace android {
+namespace uirenderer {
+
+class Barrier {
+public:
+    Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mOpened(false) { }
+    ~Barrier() { }
+
+    void open() {
+        Mutex::Autolock l(mLock);
+        mOpened = true;
+        mCondition.signal(mType);
+    }
+
+    void close() {
+        Mutex::Autolock l(mLock);
+        mOpened = false;
+    }
+
+    void wait() const {
+        Mutex::Autolock l(mLock);
+        while (!mOpened) {
+            mCondition.wait(mLock);
+        }
+    }
+
+private:
+    Condition::WakeUpType mType;
+    volatile bool mOpened;
+    mutable Mutex mLock;
+    mutable Condition mCondition;
+};
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_HWUI_BARRIER_H