1 /* 2 * Copyright (C) 2017 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 #ifndef HWUI_THREADBASE_H 18 #define HWUI_THREADBASE_H 19 20 #include "WorkQueue.h" 21 #include "utils/Macros.h" 22 23 #include <utils/Looper.h> 24 #include <utils/Thread.h> 25 26 #include <algorithm> 27 28 namespace android::uirenderer { 29 30 class ThreadBase : public Thread { 31 PREVENT_COPY_AND_ASSIGN(ThreadBase); 32 33 public: ThreadBase()34 ThreadBase() 35 : Thread(false) 36 , mLooper(new Looper(false)) 37 , mQueue([this]() { mLooper->wake(); }, mLock) {} 38 queue()39 WorkQueue& queue() { return mQueue; } 40 requestExit()41 void requestExit() { 42 Thread::requestExit(); 43 mLooper->wake(); 44 } 45 46 void start(const char* name = "ThreadBase") { Thread::run(name); } 47 join()48 void join() { Thread::join(); } 49 isRunning()50 bool isRunning() const { return Thread::isRunning(); } 51 52 protected: waitForWork()53 void waitForWork() { 54 nsecs_t nextWakeup; 55 { 56 std::unique_lock lock{mLock}; 57 nextWakeup = mQueue.nextWakeup(lock); 58 } 59 int timeout = -1; 60 if (nextWakeup < std::numeric_limits<nsecs_t>::max()) { 61 timeout = ns2ms(nextWakeup - WorkQueue::clock::now()); 62 if (timeout < 0) timeout = 0; 63 } 64 int result = mLooper->pollOnce(timeout); 65 LOG_ALWAYS_FATAL_IF(result == Looper::POLL_ERROR, "RenderThread Looper POLL_ERROR!"); 66 } 67 processQueue()68 void processQueue() { mQueue.process(); } 69 threadLoop()70 virtual bool threadLoop() override { 71 Looper::setForThread(mLooper); 72 while (!exitPending()) { 73 waitForWork(); 74 processQueue(); 75 } 76 Looper::setForThread(nullptr); 77 return false; 78 } 79 80 sp<Looper> mLooper; 81 82 private: 83 WorkQueue mQueue; 84 std::mutex mLock; 85 }; 86 87 } // namespace android::uirenderer 88 89 #endif // HWUI_THREADBASE_H 90