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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/util/locked/queue.H $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2010 - 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#ifndef __UTIL_LOCKED_QUEUE_H
#define __UTIL_LOCKED_QUEUE_H
#include <stddef.h>
#include <util/locked/lock.H>
namespace Util
{
namespace Locked
{
template <typename _T, bool locked = false, typename _S = int>
class Queue
{
public:
Queue() : head(NULL), tail(NULL), count(0), lock() {};
~Queue() {};
_T* remove();
void insert(_T*);
size_t size();
protected:
_T* head;
_T* tail;
size_t count;
_S lock;
void __lock();
void __unlock();
};
template <typename _T, bool locked, typename _S>
_T* Queue<_T,locked,_S>::remove()
{
_T* item = NULL;
__lock();
if (tail != NULL)
{
item = tail;
if (head == tail)
head = tail = NULL;
else
tail = item->prev;
count--;
}
__unlock();
return item;
}
template <typename _T, bool locked, typename _S>
void Queue<_T,locked,_S>::insert(_T* item)
{
__lock();
if (head == NULL)
{
item->next = item->prev = NULL;
head = tail = item;
}
else
{
item->prev = NULL;
item->next = head;
head = head->prev = item;
}
count++;
__unlock();
}
template <typename _T, bool locked, typename _S>
size_t Queue<_T,locked,_S>::size()
{
return count;
}
template <typename _T, bool locked, typename _S>
void Queue<_T,locked,_S>::__lock()
{
Util::Locked::LockHelper<locked,_S>(lock).lock();
}
template <typename _T, bool locked, typename _S>
void Queue<_T,locked,_S>::__unlock()
{
Util::Locked::LockHelper<locked,_S>(lock).unlock();
}
};
};
#endif
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