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/*
* Copyright 2008 Free Software Foundation, Inc.
*
*
* This software is distributed under the terms of the GNU Affero Public License.
* See the COPYING file in the main directory for details.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "LinkedLists.h"
void PointerFIFO::push_front(void* val) // by pat
{
// Pat added this routine for completeness, but never used or tested.
// The first person to use this routine should remove this assert.
ListNode *node = allocate();
node->data(val);
node->next(mHead);
mHead = node;
if (!mTail) mTail=node;
mSize++;
}
void PointerFIFO::put(void* val)
{
ListNode *node = allocate();
node->data(val);
node->next(NULL);
if (mTail!=NULL) mTail->next(node);
mTail=node;
if (mHead==NULL) mHead=node;
mSize++;
}
/** Take an item from the FIFO. */
void* PointerFIFO::get()
{
// empty list?
if (mHead==NULL) return NULL;
// normal case
ListNode* next = mHead->next();
void* retVal = mHead->data();
release(mHead);
mHead = next;
if (next==NULL) mTail=NULL;
mSize--;
return retVal;
}
ListNode *PointerFIFO::allocate()
{
if (mFreeList==NULL) return new ListNode;
ListNode* retVal = mFreeList;
mFreeList = mFreeList->next();
return retVal;
}
void PointerFIFO::release(ListNode* wNode)
{
wNode->next(mFreeList);
mFreeList = wNode;
}
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