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63 lines
2.3 KiB
Text
63 lines
2.3 KiB
Text
/*****************************************************************************
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Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/trx0purge.ic
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Purge old versions
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#include "trx0undo.h"
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/********************************************************************//**
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Calculates the file address of an undo log header when we have the file
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address of its history list node.
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@return file address of the log */
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UNIV_INLINE
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fil_addr_t
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trx_purge_get_log_from_hist(
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/*========================*/
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fil_addr_t node_addr) /*!< in: file address of the history
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list node of the log */
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{
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node_addr.boffset -= TRX_UNDO_HISTORY_NODE;
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return(node_addr);
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}
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/********************************************************************//**
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address of its history list node.
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@return true if purge_sys_t::limit <= purge_sys_t::iter */
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UNIV_INLINE
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bool
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trx_purge_check_limit(void)
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/*=======================*/
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{
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/* limit is used to track till what point purge element has been
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processed and so limit <= iter.
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undo_no ordering is enforced only within the same rollback segment.
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If a transaction uses multiple rollback segments then we need to
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consider the rollback segment space id too. */
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return(purge_sys->iter.trx_no > purge_sys->limit.trx_no
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|| (purge_sys->iter.trx_no == purge_sys->limit.trx_no
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&& ((purge_sys->iter.undo_no >= purge_sys->limit.undo_no)
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|| (purge_sys->iter.undo_rseg_space
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!= purge_sys->limit.undo_rseg_space))));
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}
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