mirror of
https://github.com/peterantypas/maiana.git
synced 2025-05-16 07:20:08 -07:00
84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
/*
|
|
Copyright (c) 2016-2020 Peter Antypas
|
|
|
|
This file is part of the MAIANA™ transponder firmware.
|
|
|
|
The firmware is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>
|
|
*/
|
|
|
|
|
|
#ifndef CIRCULARQUEUE_HPP_
|
|
#define CIRCULARQUEUE_HPP_
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
#include "_assert.h"
|
|
|
|
template<typename T> class CircularQueue
|
|
{
|
|
public:
|
|
|
|
CircularQueue(size_t size)
|
|
{
|
|
mReadPosition = 0;
|
|
mWritePosition = 0;
|
|
mSize = size;
|
|
mBuffer = new T[mSize];
|
|
ASSERT_VALID_PTR(mBuffer);
|
|
}
|
|
|
|
inline bool empty()
|
|
{
|
|
return mReadPosition == mWritePosition;
|
|
}
|
|
|
|
bool push(T &Element)
|
|
{
|
|
int nextElement = (mWritePosition + 1) % mSize;
|
|
if ( isSafeToWrite(nextElement) )
|
|
{
|
|
mBuffer[mWritePosition] = Element;
|
|
mWritePosition = nextElement;
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
|
|
bool pop(T &Element)
|
|
{
|
|
if ( empty() )
|
|
return false;
|
|
|
|
Element = mBuffer[mReadPosition];
|
|
mReadPosition = (mReadPosition + 1) % mSize;
|
|
return true;
|
|
}
|
|
|
|
|
|
private:
|
|
inline bool isSafeToWrite(int nextElement)
|
|
{
|
|
return nextElement != mReadPosition;
|
|
}
|
|
|
|
private:
|
|
volatile int mReadPosition;
|
|
volatile int mWritePosition;
|
|
size_t mSize;
|
|
volatile T* mBuffer = nullptr;
|
|
};
|
|
|
|
#endif /* CIRCULARQUEUE_HPP_ */
|