77 lines
2.4 KiB
C++
77 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 "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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mThread = std::thread([&]() {
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LOG_ALWAYS_FATAL_IF(sem_init(&mSemaphore, 0, 0), "sem_init failed");
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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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ftl::SmallVector<Work*, 10> workItems;
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Work* work = mWorks.pop();
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while (work) {
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workItems.push_back(work);
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work = mWorks.pop();
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}
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// Sequence numbers are guaranteed to be in intended order, as we assume a single
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// producer and single consumer.
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std::stable_sort(workItems.begin(), workItems.end(), [](Work* left, Work* right) {
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return left->sequence < right->sequence;
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});
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for (Work* work : workItems) {
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for (auto& task : work->tasks) {
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task();
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}
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delete work;
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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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Work* work = new Work();
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work->sequence = mSequence;
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work->tasks = std::move(tasks);
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mWorks.push(work);
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mSequence++;
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LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed");
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}
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} // namespace android
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