libsensors_iio/src/CircularBuffer.h

/*
 * Copyright (C) 2013-2015 STMicroelectronics
 * Author: Denis Ciocca - <denis.ciocca@st.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ST_CIRCULAR_BUFFER_H
#define ST_CIRCULAR_BUFFER_H

#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <pthread.h>
#include <errno.h>

typedef struct SensorBaseData {
	float raw[4];
	float offset[4];
	float processed[4];
	int64_t timestamp;
} SensorBaseData;

/*
 * class CircularBuffer
 */
class CircularBuffer {
private:
	pthread_mutex_t data_mutex;
	unsigned int lenght, elements_available;

	SensorBaseData *data_sensor;
	SensorBaseData *first_available_element;
	SensorBaseData *first_free_element;

public:
	CircularBuffer(unsigned int num_elements);
	~CircularBuffer();

	void writeElement(SensorBaseData *data);
	int readElement(SensorBaseData *data);
};

#endif /* ST_CIRCULAR_BUFFER_H */