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e9a3aa18c8
and undo_no_t. Each type is still defined as dulint. This is an initial step towards replacing dulint with a 64-bit data type. Because modern compilers have no trouble supporting 64-bit arithmetics even on 32-bit targets, the dulint struct is a relic that should go. The last remaining major use of dulint is dictionary IDs (table, index, and row ids). rb://114 approved by Sunny Bains
111 lines
3.3 KiB
Text
111 lines
3.3 KiB
Text
/*****************************************************************************
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Copyright (c) 1996, 2009, Innobase Oy. 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., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/******************************************************
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Transaction undo log record
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#ifndef UNIV_HOTBACKUP
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/**************************************************************************
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Reads from an undo log record the record type. */
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UNIV_INLINE
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ulint
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trx_undo_rec_get_type(
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/*==================*/
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/* out: record type */
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const trx_undo_rec_t* undo_rec) /* in: undo log record */
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{
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return(mach_read_from_1(undo_rec + 2) & (TRX_UNDO_CMPL_INFO_MULT - 1));
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}
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/**************************************************************************
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Reads from an undo log record the record compiler info. */
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UNIV_INLINE
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ulint
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trx_undo_rec_get_cmpl_info(
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/*=======================*/
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/* out: compiler info */
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const trx_undo_rec_t* undo_rec) /* in: undo log record */
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{
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return(mach_read_from_1(undo_rec + 2) / TRX_UNDO_CMPL_INFO_MULT);
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}
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/**************************************************************************
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Returns TRUE if an undo log record contains an extern storage field. */
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UNIV_INLINE
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ibool
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trx_undo_rec_get_extern_storage(
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/*============================*/
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/* out: TRUE if extern */
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const trx_undo_rec_t* undo_rec) /* in: undo log record */
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{
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if (mach_read_from_1(undo_rec + 2) & TRX_UNDO_UPD_EXTERN) {
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return(TRUE);
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}
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return(FALSE);
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}
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/**************************************************************************
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Reads the undo log record number. */
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UNIV_INLINE
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undo_no_t
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trx_undo_rec_get_undo_no(
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/*=====================*/
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/* out: undo no */
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const trx_undo_rec_t* undo_rec) /* in: undo log record */
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{
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const byte* ptr;
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ptr = undo_rec + 3;
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return(mach_dulint_read_much_compressed(ptr));
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}
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/**************************************************************************
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Returns the start of the undo record data area. */
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UNIV_INLINE
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ulint
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trx_undo_rec_get_offset(
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/*====================*/
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/* out: offset to the data area */
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undo_no_t undo_no) /* in: undo no read from node */
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{
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return (3 + mach_dulint_get_much_compressed_size(undo_no));
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}
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/***************************************************************************
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Copies the undo record to the heap. */
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UNIV_INLINE
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trx_undo_rec_t*
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trx_undo_rec_copy(
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/*==============*/
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/* out, own: copy of undo log record */
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trx_undo_rec_t* undo_rec, /* in: undo log record */
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mem_heap_t* heap) /* in: heap where copied */
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{
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ulint len;
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len = mach_read_from_2(undo_rec)
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- ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
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return(mem_heap_dup(heap, undo_rec, len));
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}
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#endif /* !UNIV_HOTBACKUP */
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