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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2004-09-30
* Description : camera download multi-threading handler.
*
* Copyright (C) 2004 by Renchi Raju <renchi@pooh.tam.uiuc.edu>
* 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, 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.
*
* ============================================================ */
#ifndef COMMAND_QUEUE_H
#define COMMAND_QUEUE_H
// Qt includes.
#include <qptrqueue.h>
#include <qmutex.h>
namespace Digikam
{
template<class Type> class MTQueue
{
public:
MTQueue()
{
queue_.setAutoDelete(true);
}
~MTQueue()
{
flush();
}
bool isEmpty()
{
mutex_.lock();
bool empty = queue_.isEmpty();
mutex_.unlock();
return empty;
}
void flush()
{
mutex_.lock();
queue_.clear();
mutex_.unlock();
}
void enqueue(Type * t)
{
mutex_.lock();
queue_.enqueue(t);
mutex_.unlock();
}
Type * dequeue()
{
mutex_.lock();
Type * i = queue_.dequeue();
mutex_.unlock();
return i;
}
Type * head(bool lock=true)
{
if (lock)
mutex_.lock();
Type * i = queue_.head();
if (lock)
mutex_.unlock();
return i;
}
int count()
{
mutex_.lock();
int c = queue_.count();
mutex_.unlock();
return c;
}
void lock()
{
mutex_.lock();
}
void unlock()
{
mutex_.unlock();
}
private:
QPtrQueue<Type> queue_;
QMutex mutex_;
};
} // namespace Digikam
#endif // COMMAND_QUEUE_H
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