Precache paths from a worker thread
Change-Id: I3e7b53d67e0e03e403beaf55c39350ead7f1e309
diff --git a/libs/hwui/thread/Future.h b/libs/hwui/thread/Future.h
new file mode 100644
index 0000000..340fec7
--- /dev/null
+++ b/libs/hwui/thread/Future.h
@@ -0,0 +1,58 @@
+/*
+ * 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_FUTURE_H
+#define ANDROID_HWUI_FUTURE_H
+
+#include <utils/RefBase.h>
+
+#include "Barrier.h"
+
+namespace android {
+namespace uirenderer {
+
+template<class T>
+class Future: public LightRefBase<Future<T> > {
+public:
+ Future(Condition::WakeUpType type = Condition::WAKE_UP_ONE): mBarrier(type), mResult() { }
+ ~Future() { }
+
+ /**
+ * Returns the result of this future, blocking if
+ * the result is not available yet.
+ */
+ T get() const {
+ mBarrier.wait();
+ return mResult;
+ }
+
+ /**
+ * This method must be called only once.
+ */
+ void produce(T result) {
+ mResult = result;
+ mBarrier.open();
+ }
+
+private:
+ Barrier mBarrier;
+ T mResult;
+};
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_HWUI_FUTURE_H