1/*****************************************************************************
2
3Copyright (c) 1996, 2009, Oracle and/or its affiliates. All Rights Reserved.
4
5This program is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License, version 2.0,
7as published by the Free Software Foundation.
8
9This program is also distributed with certain software (including
10but not limited to OpenSSL) that is licensed under separate terms,
11as designated in a particular file or component or in included license
12documentation.  The authors of MySQL hereby grant you an additional
13permission to link the program and your derivative works with the
14separately licensed software that they have included with MySQL.
15
16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19GNU General Public License, version 2.0, for more details.
20
21You should have received a copy of the GNU General Public License along with
22this program; if not, write to the Free Software Foundation, Inc.,
2351 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
24
25*****************************************************************************/
26
27/**************************************************//**
28@file include/trx0purge.ic
29Purge old versions
30
31Created 3/26/1996 Heikki Tuuri
32*******************************************************/
33
34#include "trx0undo.h"
35
36/********************************************************************//**
37Calculates the file address of an undo log header when we have the file
38address of its history list node.
39@return	file address of the log */
40UNIV_INLINE
41fil_addr_t
42trx_purge_get_log_from_hist(
43/*========================*/
44	fil_addr_t	node_addr)	/*!< in: file address of the history
45					list node of the log */
46{
47	node_addr.boffset -= TRX_UNDO_HISTORY_NODE;
48
49	return(node_addr);
50}
51
52#ifdef UNIV_DEBUG
53/********************************************************************//**
54address of its history list node.
55@return	TRUE if purge_sys_t::limit <= purge_sys_t::iter*/
56UNIV_INLINE
57ibool
58trx_purge_check_limit(void)
59/*=======================*/
60{
61	ut_ad(purge_sys->limit.trx_no <= purge_sys->iter.trx_no);
62
63	if (purge_sys->limit.trx_no == purge_sys->iter.trx_no) {
64		ut_ad(purge_sys->limit.undo_no <= purge_sys->iter.undo_no);
65	}
66
67	return(TRUE);
68}
69#endif /* UNIV_DEBUG */
70
71