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86 lines
2.2 KiB
Text
86 lines
2.2 KiB
Text
/******************************************************
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Transaction undo log record
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(c) 1996 Innobase Oy
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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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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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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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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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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dulint
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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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trx_undo_rec_t* undo_rec) /* in: undo log record */
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{
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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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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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trx_undo_rec_t* rec_copy;
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len = mach_read_from_2(undo_rec) + buf_frame_align(undo_rec)
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- undo_rec;
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rec_copy = mem_heap_alloc(heap, len);
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ut_memcpy(rec_copy, undo_rec, len);
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return(rec_copy);
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}
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