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d0e8306203
Made innodb to compile more cleanly with debugging options enabled. Fixed a few bugs and found a few possible bugs, which I hope Heikki will check. Comments needs to be fixed too. Some while() functions should be changed to do ... until for documenting purposes, because some of them must and will be processed at least once, or a variable would be used uninitialized. Regards, Jani
83 lines
2.3 KiB
Text
83 lines
2.3 KiB
Text
/******************************************************
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Row versions
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(c) 1997 Innobase Oy
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Created 2/6/1997 Heikki Tuuri
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*******************************************************/
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#include "row0row.h"
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#include "dict0dict.h"
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#include "read0read.h"
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#include "page0page.h"
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#include "log0recv.h"
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/*************************************************************************
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Fetches the trx id of a clustered index record or version. */
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UNIV_INLINE
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dulint
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row_vers_get_trx_id(
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/*================*/
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/* out: trx id or ut_dulint_zero if the
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clustered index record not found */
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rec_t* rec, /* in: clustered index record, or an old
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version of it */
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dict_table_t* table) /* in: table */
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{
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return(row_get_rec_trx_id(rec, dict_table_get_first_index(table)));
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}
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/*************************************************************************
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Checks if a consistent read can be performed immediately on the index
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record, or if an older version is needed. */
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UNIV_INLINE
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ibool
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row_vers_clust_rec_sees_older(
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/*==========================*/
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/* out: FALSE if can read immediately */
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rec_t* rec, /* in: record which should be read or passed
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over by a read cursor */
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dict_index_t* index, /* in: clustered index */
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read_view_t* view) /* in: read view */
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{
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ut_ad(index->type & DICT_CLUSTERED);
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if (read_view_sees_trx_id(view, row_get_rec_trx_id(rec, index))) {
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return(FALSE);
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}
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return(TRUE);
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}
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/*************************************************************************
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Checks if a secondary index record can be read immediately by a consistent
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read, or if an older version may be needed. To be sure, we will have to
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look in the clustered index. */
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UNIV_INLINE
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ibool
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row_vers_sec_rec_may_see_older(
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/*===========================*/
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/* out: FALSE if can be read immediately */
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rec_t* rec, /* in: record which should be read or passed */
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dict_index_t* index __attribute__((unused)),/* in: secondary index */
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read_view_t* view) /* in: read view */
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{
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page_t* page;
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ut_ad(!(index->type & DICT_CLUSTERED));
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page = buf_frame_align(rec);
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if ((ut_dulint_cmp(page_get_max_trx_id(page), view->up_limit_id) >= 0)
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|| recv_recovery_is_on()) {
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/* It may be that the record was inserted or modified by a
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transaction the view should not see: we have to look in the
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clustered index */
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return(TRUE);
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}
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return(FALSE);
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}
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