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/***************************************************************************
FixedPool.h - simple pool with fixed number of elements
-------------------
begin : Thu Jan 02 2014
copyright : (C) 2014 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef FIXED_POOL_H
#define FIXED_POOL_H
#include "config.h"
#include <QMutex>
#include <QMutexLocker>
#include <QQueue>
#include <QSemaphore>
namespace Kwave
{
template<unsigned int SIZE, class T> class FixedPool
{
public:
/** Constructor */
FixedPool()
:m_storage(), m_free_queue(), m_sem_free(0), m_lock()
{
for (unsigned int i = 0; i < SIZE; ++i)
release(&(m_storage[i]));
}
/** Destructor */
virtual ~FixedPool() { }
/**
* Allocate an element from the pool
* @return pointer to an element
*/
T *allocate() {
m_sem_free.acquire();
{
QMutexLocker _lock(&m_lock);
return m_free_queue.dequeue();
}
}
/**
* Release an element and put it back into the pool
* @param element pointer to an element
*/
void release(T *element) {
QMutexLocker _lock(&m_lock);
m_free_queue.enqueue(element);
m_sem_free.release();
}
private:
/** array used as storage for the pool elements */
T m_storage[SIZE];
/** queue with free elements */
QQueue<T *> m_free_queue;
/** semaphore for counting available elements */
QSemaphore m_sem_free;
/** lock for protecting the m_free_queue */
QMutex m_lock;
};
}
#endif /* FIXED_POOL_H */
//***************************************************************************
//***************************************************************************
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