77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
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/*
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* Copyright (C) 2019 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 _DNS_LOCKED_QUEUE_H
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#define _DNS_LOCKED_QUEUE_H
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#include <algorithm>
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#include <deque>
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#include <mutex>
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#include <android-base/thread_annotations.h>
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namespace android {
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namespace net {
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template <typename T>
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class LockedQueue {
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public:
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// Push an item onto the queue.
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void push(T item) {
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std::lock_guard guard(mLock);
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mQueue.push_front(std::move(item));
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}
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// Swap out the contents of the queue
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void swap(std::deque<T>& other) {
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std::lock_guard guard(mLock);
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mQueue.swap(other);
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}
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private:
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std::mutex mLock;
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std::deque<T> mQueue GUARDED_BY(mLock);
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};
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template <typename T>
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class LockedRingBuffer {
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public:
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explicit LockedRingBuffer(size_t size) : mCapacity(size) {}
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void push(T&& record) {
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std::lock_guard guard(mLock);
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mQueue.push_back(std::move(record));
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if (mQueue.size() > mCapacity) {
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mQueue.pop_front();
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}
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}
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std::deque<T> copy() const {
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std::lock_guard guard(mLock);
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return mQueue;
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}
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private:
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mutable std::mutex mLock;
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const size_t mCapacity;
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std::deque<T> mQueue GUARDED_BY(mLock);
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};
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} // end of namespace net
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} // end of namespace android
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#endif // _DNS_LOCKEDQUEUE_H
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