64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/*
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* Copyright (C) 2015 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 RING_BUFFER_H_
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#define RING_BUFFER_H_
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#include <media/stagefright/foundation/ABase.h>
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#include <hardware/sensors.h>
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#include <utils/threads.h>
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namespace android {
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struct RingBuffer {
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explicit RingBuffer(size_t size);
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~RingBuffer();
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ssize_t write(const sensors_event_t *ev, size_t size);
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ssize_t read(sensors_event_t *ev, size_t size);
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private:
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Mutex mLock;
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Condition mNotEmptyCondition;
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size_t mSize;
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sensors_event_t *mData;
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size_t mReadPos, mWritePos;
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DISALLOW_EVIL_CONSTRUCTORS(RingBuffer);
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};
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struct LockfreeBuffer {
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LockfreeBuffer(void* buf, size_t size);
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~LockfreeBuffer();
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// support single writer
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void write(const sensors_event_t *ev, size_t size);
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private:
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sensors_event_t *mData;
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size_t mSize;
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size_t mWritePos;
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int32_t mCounter;
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DISALLOW_EVIL_CONSTRUCTORS(LockfreeBuffer);
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};
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} // namespace android
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#endif // RING_BUFFER_H_
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