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by brian
clean slate |
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/******************************************************
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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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