1 /* 2 * Copyright 2022 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 <compositionengine/impl/HwcAsyncWorker.h> 18 #include <processgroup/sched_policy.h> 19 #include <pthread.h> 20 #include <sched.h> 21 #include <sys/prctl.h> 22 #include <sys/resource.h> 23 #include <system/thread_defs.h> 24 25 #include <android-base/thread_annotations.h> 26 #include <cutils/sched_policy.h> 27 28 namespace android::compositionengine::impl { 29 HwcAsyncWorker()30HwcAsyncWorker::HwcAsyncWorker() { 31 mThread = std::thread(&HwcAsyncWorker::run, this); 32 pthread_setname_np(mThread.native_handle(), "HwcAsyncWorker"); 33 } 34 ~HwcAsyncWorker()35HwcAsyncWorker::~HwcAsyncWorker() { 36 { 37 std::scoped_lock lock(mMutex); 38 mDone = true; 39 mCv.notify_all(); 40 } 41 if (mThread.joinable()) { 42 mThread.join(); 43 } 44 } send(std::function<bool ()> task)45std::future<bool> HwcAsyncWorker::send(std::function<bool()> task) { 46 std::unique_lock<std::mutex> lock(mMutex); 47 android::base::ScopedLockAssertion assumeLock(mMutex); 48 mTask = std::packaged_task<bool()>([task = std::move(task)]() { return task(); }); 49 mTaskRequested = true; 50 mCv.notify_one(); 51 return mTask.get_future(); 52 } 53 run()54void HwcAsyncWorker::run() { 55 set_sched_policy(0, SP_FOREGROUND); 56 struct sched_param param = {0}; 57 param.sched_priority = 2; 58 sched_setscheduler(gettid(), SCHED_FIFO, ¶m); 59 60 std::unique_lock<std::mutex> lock(mMutex); 61 android::base::ScopedLockAssertion assumeLock(mMutex); 62 while (!mDone) { 63 mCv.wait(lock); 64 if (mTaskRequested && mTask.valid()) { 65 mTask(); 66 mTaskRequested = false; 67 } 68 } 69 } 70 71 } // namespace android::compositionengine::impl 72