1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef RING_BUFFER_H_ 18 19 #define RING_BUFFER_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 23 #include <hardware/sensors.h> 24 #include <utils/threads.h> 25 26 namespace android { 27 28 class RingBuffer { 29 public: 30 explicit RingBuffer(size_t size); 31 ~RingBuffer(); 32 33 ssize_t write(const sensors_event_t *ev, size_t size); 34 ssize_t read(sensors_event_t *ev, size_t size); 35 36 private: 37 Mutex mLock; 38 Condition mNotEmptyCondition; 39 40 size_t mSize; 41 sensors_event_t *mData; 42 size_t mReadPos, mWritePos; 43 44 DISALLOW_EVIL_CONSTRUCTORS(RingBuffer); 45 }; 46 47 } // namespace android 48 49 #endif // RING_BUFFER_H_ 50
