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/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#undef LOG_TAG
#define LOG_TAG "BackgroundExecutor"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include <utils/Log.h>
#include "BackgroundExecutor.h"
namespace android {
ANDROID_SINGLETON_STATIC_INSTANCE(BackgroundExecutor);
BackgroundExecutor::BackgroundExecutor() : Singleton<BackgroundExecutor>() {
mThread = std::thread([&]() {
LOG_ALWAYS_FATAL_IF(sem_init(&mSemaphore, 0, 0), "sem_init failed");
while (!mDone) {
LOG_ALWAYS_FATAL_IF(sem_wait(&mSemaphore), "sem_wait failed (%d)", errno);
ftl::SmallVector<Work*, 10> workItems;
Work* work = mWorks.pop();
while (work) {
workItems.push_back(work);
work = mWorks.pop();
}
// Sequence numbers are guaranteed to be in intended order, as we assume a single
// producer and single consumer.
std::stable_sort(workItems.begin(), workItems.end(), [](Work* left, Work* right) {
return left->sequence < right->sequence;
});
for (Work* work : workItems) {
for (auto& task : work->tasks) {
task();
}
delete work;
}
}
});
}
BackgroundExecutor::~BackgroundExecutor() {
mDone = true;
LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed");
if (mThread.joinable()) {
mThread.join();
LOG_ALWAYS_FATAL_IF(sem_destroy(&mSemaphore), "sem_destroy failed");
}
}
void BackgroundExecutor::sendCallbacks(Callbacks&& tasks) {
Work* work = new Work();
work->sequence = mSequence;
work->tasks = std::move(tasks);
mWorks.push(work);
mSequence++;
LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed");
}
} // namespace android
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