upload android base code part6

android/system/libhidl/base/TaskRunner.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include <hidl/TaskRunner.h>
+#include <thread>
+
+namespace android {
+namespace hardware {
+namespace details {
+
+TaskRunner::TaskRunner() {
+}
+
+void TaskRunner::start(size_t limit) {
+    mQueue = std::make_shared<SynchronizedQueue<Task>>(limit);
+
+    // Allow the thread to continue running in background;
+    // TaskRunner do not care about the std::thread object.
+    std::thread{[q = mQueue] {
+        Task nextTask;
+        while (!!(nextTask = q->wait_pop())) {
+            nextTask();
+        }
+    }}.detach();
+}
+
+TaskRunner::~TaskRunner() {
+    if (mQueue) {
+        mQueue->push(nullptr);
+    }
+}
+
+bool TaskRunner::push(const Task &t) {
+    return (mQueue != nullptr) && (!!t) && this->mQueue->push(t);
+}
+
+} // namespace details
+} // namespace hardware
+} // namespace android
+