Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2021 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 | //#define LOG_NDEBUG 0 |
| 18 | #undef LOG_TAG |
| 19 | #define LOG_TAG "BackgroundExecutor" |
| 20 | #define ATRACE_TAG ATRACE_TAG_GRAPHICS |
| 21 | |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 22 | #include <utils/Log.h> |
| 23 | |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 24 | #include "BackgroundExecutor.h" |
| 25 | |
| 26 | namespace android { |
| 27 | |
| 28 | ANDROID_SINGLETON_STATIC_INSTANCE(BackgroundExecutor); |
| 29 | |
| 30 | BackgroundExecutor::BackgroundExecutor() : Singleton<BackgroundExecutor>() { |
| 31 | mThread = std::thread([&]() { |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 32 | LOG_ALWAYS_FATAL_IF(sem_init(&mSemaphore, 0, 0), "sem_init failed"); |
| 33 | while (!mDone) { |
| 34 | LOG_ALWAYS_FATAL_IF(sem_wait(&mSemaphore), "sem_wait failed (%d)", errno); |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 35 | |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 36 | ftl::SmallVector<Work*, 10> workItems; |
| 37 | |
| 38 | Work* work = mWorks.pop(); |
| 39 | while (work) { |
| 40 | workItems.push_back(work); |
| 41 | work = mWorks.pop(); |
| 42 | } |
| 43 | |
| 44 | // Sequence numbers are guaranteed to be in intended order, as we assume a single |
| 45 | // producer and single consumer. |
| 46 | std::stable_sort(workItems.begin(), workItems.end(), [](Work* left, Work* right) { |
| 47 | return left->sequence < right->sequence; |
| 48 | }); |
| 49 | for (Work* work : workItems) { |
| 50 | for (auto& task : work->tasks) { |
| 51 | task(); |
| 52 | } |
| 53 | delete work; |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 54 | } |
| 55 | } |
| 56 | }); |
| 57 | } |
| 58 | |
| 59 | BackgroundExecutor::~BackgroundExecutor() { |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 60 | mDone = true; |
| 61 | LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed"); |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 62 | if (mThread.joinable()) { |
| 63 | mThread.join(); |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 64 | LOG_ALWAYS_FATAL_IF(sem_destroy(&mSemaphore), "sem_destroy failed"); |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 65 | } |
| 66 | } |
| 67 | |
Alec Mouri | 8d7d0f4 | 2022-05-10 23:33:40 +0000 | [diff] [blame^] | 68 | void BackgroundExecutor::sendCallbacks(Callbacks&& tasks) { |
| 69 | Work* work = new Work(); |
| 70 | work->sequence = mSequence; |
| 71 | work->tasks = std::move(tasks); |
| 72 | mWorks.push(work); |
| 73 | mSequence++; |
| 74 | LOG_ALWAYS_FATAL_IF(sem_post(&mSemaphore), "sem_post failed"); |
Vishnu Nair | 34eb9ca | 2021-11-18 15:23:23 -0800 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | } // namespace android |