mirror of
https://github.com/openharmony/resourceschedule_ffrt.git
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董洁
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/*
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* Copyright (c) 2023 Huawei Device Co., Ltd.
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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 FFRT_SPMC_QUEUE_H
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#define FFRT_SPMC_QUEUE_H
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#include <atomic>
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namespace ffrt {
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class SpmcQueue {
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public:
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~SpmcQueue();
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std::size_t GetLength() const;
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std::size_t GetCapacity() const;
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/**
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* @brief 初始化队列。
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* @param capacity 队列容量。
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* @retval 成功返回0，失败返回-1。
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*/
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int Init(std::size_t capacity);
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/**
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* @brief 取出队列首部元素。
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* @retval 指向首部元素的指针，若队列为空则返回nullptr。
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*/
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void* PopHead();
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/**
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* @brief 将元素推入队列尾部。
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* @param object 要推入队列的元素。
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* @retval 成功返回0，失败返回-1。
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*/
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int PushTail(void* object);
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/**
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* @brief 从队列首部批量取出元素后将元素批量推入目标队列尾部。
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* @param dstQueue 目标队列。
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* @param elementNum 取出元素数量。
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* @param func 元素入队操作。
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* @retval 返回被推入队列尾部的元素数量。
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*/
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using PushFunc = void(*)(void*);
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unsigned int PopHeadToAnotherQueue(SpmcQueue& dstQueue, unsigned int elementNum, PushFunc func);
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private:
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void** buf_ = nullptr;
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std::size_t capacity_ = 0;
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std::atomic<std::size_t> head_ {0};
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std::atomic<std::size_t> tail_ {0};
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};
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}
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#endif
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