1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <hidl/TaskRunner.h> 18 19 #include <utils/AndroidThreads.h> 20 #include "SynchronizedQueue.h" 21 22 #include <thread> 23 24 namespace android { 25 namespace hardware { 26 namespace details { 27 TaskRunner()28 TaskRunner::TaskRunner() { 29 } 30 start(size_t limit)31 void TaskRunner::start(size_t limit) { 32 mQueue = std::make_shared<SynchronizedQueue<Task>>(limit); 33 } 34 ~TaskRunner()35 TaskRunner::~TaskRunner() { 36 if (mQueue) { 37 mQueue->push(nullptr); 38 } 39 } 40 push(const Task & t)41 bool TaskRunner::push(const Task &t) { 42 if (mQueue == nullptr || !t) { 43 return false; 44 } 45 46 { 47 std::unique_lock<std::mutex> lock = mQueue->lock(); 48 49 if (!mQueue->isInitializedLocked()) { 50 // Allow the thread to continue running in background; 51 // TaskRunner do not care about the std::thread object. 52 std::thread{[q = mQueue] { 53 androidSetThreadName("HIDL TaskRunner"); 54 55 Task nextTask; 56 while (!!(nextTask = q->wait_pop())) { 57 nextTask(); 58 } 59 }}.detach(); 60 61 mQueue->setInitializedLocked(true); 62 } 63 } 64 65 return this->mQueue->push(t); 66 } 67 68 } // namespace details 69 } // namespace hardware 70 } // namespace android 71 72