/* $Id$ */
/*
** Copyright (C) 2014-2016 Cisco and/or its affiliates. All rights reserved.
** Copyright (C) 2002-2013 Sourcefire, Inc.
** Copyright (C) 2002 Martin Roesch <roesch@sourcefire.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License Version 2 as
** published by the Free Software Foundation.  You may not use, modify or
** distribute this program under any other version of the GNU General
** Public License.
**
** 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.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/


#ifndef _MEMPOOL_H
#define _MEMPOOL_H

#include "sf_sdlist_types.h"
#include "sf_types.h"
#include "snort_debug.h"

typedef unsigned int PoolCount;

typedef struct _MemBucket
{
    SDListItem *key;
    int used;
    void *data;
} MemBucket;

typedef struct _MemPool
{
    void **datapool; /* memory buffer for MemBucket->data */

    MemBucket *bucketpool; /* memory buffer */

    SDListItem *listpool; /* list of things to use for memory bufs */

    PoolCount total;

    sfSDList free_list;
    sfSDList used_list;

    size_t obj_size;
} MemPool;

int mempool_init(MemPool *mempool, PoolCount num_objects, size_t obj_size);
int mempool_destroy(MemPool *mempool);
MemBucket *mempool_alloc(MemPool *mempool);
void mempool_free(MemPool *mempool, MemBucket *obj);
int mempool_clean(MemPool *mempool);

static inline MemBucket* mempool_oldestUsedBucket(
        MemPool *mempool
        )
{
    SDListItem *li = mempool->used_list.head;

    if (li)
    {
        return li->data;
    }

    return NULL;
}
static inline unsigned int mempool_numUsedBucket(
        MemPool *mempool
        )
{
    return mempool->used_list.size;
}

#endif /* _MEMPOOL_H */


