78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#undef LOG_TAG
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#define LOG_TAG "BackgroundExecutor"
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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
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#include <utils/Log.h>
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#include <mutex>
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#include "BackgroundExecutor.h"
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namespace android {
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ANDROID_SINGLETON_STATIC_INSTANCE(BackgroundExecutor);
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BackgroundExecutor::BackgroundExecutor() : Singleton<BackgroundExecutor>() {
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// mSemaphore must be initialized before any calls to
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// BackgroundExecutor::sendCallbacks. For this reason, we initialize it
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// within the constructor instead of within mThread.
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LOG_ALWAYS_FATAL_IF(sem_init(&mSemaphore, 0, 0), "sem_init failed");
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mThread = std::thread([&]() {
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while (!mDone) {
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LOG_ALWAYS_FATAL_IF(sem_wait(&mSemaphore), "sem_wait failed (%d)", errno);
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auto callbacks = mCallbacksQueue.pop();
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if (!callbacks) {
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continue;
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}
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for (auto& callback : *callbacks) {
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callback();
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}
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}
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});
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}
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BackgroundExecutor::~BackgroundExecutor() {
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mDone = true;
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LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed");
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if (mThread.joinable()) {
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mThread.join();
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LOG_ALWAYS_FATAL_IF(sem_destroy(&mSemaphore), "sem_destroy failed");
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}
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}
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void BackgroundExecutor::sendCallbacks(Callbacks&& tasks) {
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mCallbacksQueue.push(std::move(tasks));
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LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed");
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}
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void BackgroundExecutor::flushQueue() {
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std::mutex mutex;
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std::condition_variable cv;
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bool flushComplete = false;
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sendCallbacks({[&]() {
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std::scoped_lock lock{mutex};
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flushComplete = true;
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cv.notify_one();
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}});
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std::unique_lock<std::mutex> lock{mutex};
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cv.wait(lock, [&]() { return flushComplete; });
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}
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} // namespace android
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