mirror of
https://github.com/MariaDB/server.git
synced 2025-01-31 02:51:44 +01:00
73 lines
2.3 KiB
Text
73 lines
2.3 KiB
Text
/*****************************************************************************
|
|
|
|
Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
|
|
|
|
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, Suite 500, Boston, MA 02110-1335 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/**************************************************//**
|
|
@file include/trx0rec.ic
|
|
Transaction undo log record
|
|
|
|
Created 3/26/1996 Heikki Tuuri
|
|
*******************************************************/
|
|
|
|
/**********************************************************************//**
|
|
Reads from an undo log record the record type.
|
|
@return record type */
|
|
UNIV_INLINE
|
|
ulint
|
|
trx_undo_rec_get_type(
|
|
/*==================*/
|
|
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
|
|
{
|
|
return(mach_read_from_1(undo_rec + 2) & (TRX_UNDO_CMPL_INFO_MULT - 1));
|
|
}
|
|
|
|
/**********************************************************************//**
|
|
Reads the undo log record number.
|
|
@return undo no */
|
|
UNIV_INLINE
|
|
undo_no_t
|
|
trx_undo_rec_get_undo_no(
|
|
/*=====================*/
|
|
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
|
|
{
|
|
const byte* ptr;
|
|
|
|
ptr = undo_rec + 3;
|
|
|
|
return(mach_u64_read_much_compressed(ptr));
|
|
}
|
|
|
|
/***********************************************************************//**
|
|
Copies the undo record to the heap.
|
|
@return own: copy of undo log record */
|
|
UNIV_INLINE
|
|
trx_undo_rec_t*
|
|
trx_undo_rec_copy(
|
|
/*==============*/
|
|
const trx_undo_rec_t* undo_rec, /*!< in: undo log record */
|
|
mem_heap_t* heap) /*!< in: heap where copied */
|
|
{
|
|
ulint len;
|
|
|
|
len = mach_read_from_2(undo_rec)
|
|
- ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
|
|
ut_ad(len < UNIV_PAGE_SIZE);
|
|
trx_undo_rec_t* rec = static_cast<trx_undo_rec_t*>(
|
|
mem_heap_dup(heap, undo_rec, len));
|
|
mach_write_to_2(rec, len);
|
|
return rec;
|
|
}
|