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/* Copyright (C) 2003 MySQL AB
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; version 2 of the 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 __UNDO_BUFFER_HPP
#define __UNDO_BUFFER_HPP
#include <ndb_global.h>
#include <kernel_types.h>
struct Undo_buffer
{
Undo_buffer(class Dbtup*);
/**
* Alloc space for a copy tuple of size <em>words</em>
* store address to copy in dst
* supply pointer to original in curr
*
* @return 0 if unable to alloc space
*/
Uint32 * alloc_copy_tuple(Local_key* dst, Uint32 words);
/**
* Shrink size of copy tuple
* note: Only shrink latest allocated tuple
*/
void shrink_copy_tuple(Local_key* dst, Uint32 words);
/**
* Free space for copy tuple at key
*/
void free_copy_tuple(Local_key* key);
/**
* Get pointer to copy tuple
*/
Uint32 * get_ptr(Local_key* key);
private:
class Dbtup* m_tup;
Uint32 m_first_free;
};
#endif
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