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/* MtxCircBuf.h */
/* Copyright (C) 2012 mbed.org, MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef MTXCIRCBUFFER_H
#define MTXCIRCBUFFER_H
#include "rtos.h"
//Mutex protected circualr buffer
template<typename T, int size>
class MtxCircBuffer
{
public:
MtxCircBuffer() //:
//mtx()
{
write = 0;
read = 0;
}
bool isFull()
{
mtx.lock();
bool r = (((write + 1) % size) == read);
mtx.unlock();
return r;
}
bool isEmpty()
{
mtx.lock();
bool r = (read == write);
mtx.unlock();
return r;
}
void queue(T k)
{
mtx.lock();
buf[write++] = k;
write %= size;
if (isFull())
{
read++;
read %= size;
}
mtx.unlock();
}
uint16_t available()
{
mtx.lock();
uint16_t a = (write >= read) ? (write - read) : (size - read + write);
mtx.unlock();
return a;
}
bool dequeue(T * c)
{
mtx.lock();
bool empty = (read == write);
if (!empty)
{
*c = buf[read++];
read %= size;
}
mtx.unlock();
return (!empty);
}
private:
volatile uint16_t write;
volatile uint16_t read;
volatile T buf[size];
Mutex mtx;
};
#endif
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