bat-sense/main/src/data_structures/shared_data.h

#ifndef _SHARED_DATA_H_
#define _SHARED_DATA_H_

#include "freertos/semphr.h"


template <typename T>
class SharedData 
{
public:
    SharedData() 
    {
        _mutex = xSemaphoreCreateMutex();
        _data_ready = false;
    }

    ~SharedData() 
    {
        if (_mutex != NULL) 
        {
            vSemaphoreDelete(_mutex);
        }
    }

    bool write(const T& data) 
    {
        if (xSemaphoreTake(_mutex, portMAX_DELAY) == pdTRUE) 
        {
            _data = data;
            _data_ready = true;
            xSemaphoreGive(_mutex);
            return true;
        }
        return false;
    }

    bool read(T& data) 
    {
        if (xSemaphoreTake(_mutex, pdMS_TO_TICKS(portMAX_DELAY)) == pdTRUE) 
        {
            if (_data_ready) 
            {
                data = _data;
                _data_ready = false;
                xSemaphoreGive(_mutex);
                return true;
            }
            xSemaphoreGive(_mutex);
        }
    
        return false;
    }

    void clear()
    {
        if (xSemaphoreTake(_mutex, pdMS_TO_TICKS(portMAX_DELAY)) == pdTRUE) 
        {
            _data_ready = false;
            xSemaphoreGive(_mutex);
        }
    }
    
private:
    T _data;
    bool _data_ready;
    SemaphoreHandle_t _mutex;
};

#endif // _SHARED_DATA_H_