mirror of
https://gitee.com/openharmony/developtools_hiperf
synced 2024-12-12 02:03:50 +00:00
54 lines
1.7 KiB
C++
Executable File
54 lines
1.7 KiB
C++
Executable File
/*
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* Copyright (c) 2021 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 HIPERF_RING_BUFFER_H
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#define HIPERF_RING_BUFFER_H
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#include <atomic>
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#include <memory>
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namespace OHOS {
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namespace Developtools {
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namespace HiPerf {
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class RingBuffer {
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public:
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// little endian, perf_event_header.type is less than 0xff, so set it
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static constexpr uint8_t MARGIN_BYTE = 0xFF;
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RingBuffer(size_t size);
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~RingBuffer();
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// get size of the writable space
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size_t GetFreeSize() const;
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// before writing data to rbuff, alloc space first
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uint8_t *AllocForWrite(size_t writeSize);
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// after writing data, move head pointer
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void EndWrite();
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// get data from buff, return nullptr if no readable data
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uint8_t *GetReadData();
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// after reading, move tail pointer
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void EndRead();
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private:
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std::unique_ptr<uint8_t[]> buf_ = nullptr;
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const size_t size_;
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std::atomic_size_t head_ = 0; // write after this, always increase
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std::atomic_size_t tail_ = 0; // read from this, always increase
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size_t writeSize_ = 0;
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size_t readSize_ = 0;
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};
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} // namespace HiPerf
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} // namespace Developtools
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} // namespace OHOS
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#endif |