87 lines
1.5 KiB
C++
87 lines
1.5 KiB
C++
/*
|
|
* \brief List of double connected items
|
|
* \author Martin Stein
|
|
* \date 2012-11-30
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2012-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/* core includes */
|
|
#include <kernel/double_list.h>
|
|
|
|
using namespace Kernel;
|
|
|
|
|
|
void Double_list::_connect_neighbors(Item * const i)
|
|
{
|
|
i->_prev->_next = i->_next;
|
|
i->_next->_prev = i->_prev;
|
|
}
|
|
|
|
|
|
void Double_list::_to_tail(Item * const i)
|
|
{
|
|
if (i == _tail) { return; }
|
|
_connect_neighbors(i);
|
|
i->_prev = _tail;
|
|
i->_next = 0;
|
|
_tail->_next = i;
|
|
_tail = i;
|
|
}
|
|
|
|
|
|
Double_list::Double_list(): _head(0), _tail(0) { }
|
|
|
|
|
|
void Double_list::to_tail(Item * const i)
|
|
{
|
|
if (i == _head) { head_to_tail(); }
|
|
else { _to_tail(i); }
|
|
}
|
|
|
|
|
|
void Double_list::insert_tail(Item * const i)
|
|
{
|
|
if (_tail) { _tail->_next = i; }
|
|
else { _head = i; }
|
|
i->_prev = _tail;
|
|
i->_next = 0;
|
|
_tail = i;
|
|
}
|
|
|
|
|
|
void Double_list::insert_head(Item * const i)
|
|
{
|
|
if (_head) { _head->_prev = i; }
|
|
else { _tail = i; }
|
|
i->_next = _head;
|
|
i->_prev = 0;
|
|
_head = i;
|
|
}
|
|
|
|
|
|
void Double_list::remove(Item * const i)
|
|
{
|
|
if (i == _tail) { _tail = i->_prev; }
|
|
else { i->_next->_prev = i->_prev; }
|
|
if (i == _head) { _head = i->_next; }
|
|
else { i->_prev->_next = i->_next; }
|
|
}
|
|
|
|
|
|
void Double_list::head_to_tail()
|
|
{
|
|
if (!_head || _head == _tail) { return; }
|
|
_head->_prev = _tail;
|
|
_tail->_next = _head;
|
|
_head = _head->_next;
|
|
_head->_prev = 0;
|
|
_tail = _tail->_next;
|
|
_tail->_next = 0;
|
|
}
|