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114 lines
2.6 KiB
114 lines
2.6 KiB
/*
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* Copyright (C) 2016 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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#ifndef ANDROID_HIDL_SYNCHRONIZED_QUEUE_H
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#define ANDROID_HIDL_SYNCHRONIZED_QUEUE_H
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#include <condition_variable>
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#include <mutex>
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#include <queue>
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#include <thread>
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namespace android {
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namespace hardware {
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namespace details {
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/* Threadsafe queue.
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*/
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template <typename T>
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struct SynchronizedQueue {
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SynchronizedQueue(size_t limit);
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/* Gets an item from the front of the queue.
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*
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* Blocks until the item is available.
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*/
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T wait_pop();
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/* Puts an item onto the end of the queue.
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*/
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bool push(const T& item);
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/* Gets the size of the array.
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*/
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size_t size();
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std::unique_lock<std::mutex> lock() {
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return std::unique_lock<std::mutex>(mMutex);
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}
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bool isInitializedLocked() {
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return mInitialized;
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}
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void setInitializedLocked(bool isInitialized) {
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mInitialized = isInitialized;
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}
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private:
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std::condition_variable mCondition;
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std::mutex mMutex;
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std::queue<T> mQueue;
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const size_t mQueueLimit;
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bool mInitialized = false;
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};
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template <typename T>
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SynchronizedQueue<T>::SynchronizedQueue(size_t limit) : mQueueLimit(limit) {
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}
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template <typename T>
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T SynchronizedQueue<T>::wait_pop() {
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std::unique_lock<std::mutex> lock(mMutex);
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mCondition.wait(lock, [this]{
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return !this->mQueue.empty();
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});
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T item = mQueue.front();
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mQueue.pop();
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return item;
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}
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template <typename T>
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bool SynchronizedQueue<T>::push(const T &item) {
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bool success;
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{
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std::unique_lock<std::mutex> lock(mMutex);
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if (mQueue.size() < mQueueLimit) {
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mQueue.push(item);
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success = true;
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} else {
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success = false;
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}
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}
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mCondition.notify_one();
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return success;
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}
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template <typename T>
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size_t SynchronizedQueue<T>::size() {
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std::unique_lock<std::mutex> lock(mMutex);
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return mQueue.size();
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}
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} // namespace details
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} // namespace hardware
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} // namespace android
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#endif // ANDROID_HIDL_SYNCHRONIZED_QUEUE_H
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