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67 lines
1.6 KiB
Text
67 lines
1.6 KiB
Text
/************************************************************************
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The index tree adaptive search
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(c) 1996 Innobase Oy
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Created 2/17/1996 Heikki Tuuri
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*************************************************************************/
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#include "dict0mem.h"
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#include "btr0cur.h"
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#include "buf0buf.h"
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/*************************************************************************
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Updates the search info. */
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void
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btr_search_info_update_slow(
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/*========================*/
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btr_search_t* info, /* in/out: search info */
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btr_cur_t* cursor);/* in: cursor which was just positioned */
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/************************************************************************
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Returns search info for an index. */
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UNIV_INLINE
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btr_search_t*
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btr_search_get_info(
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/*================*/
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/* out: search info; search mutex reserved */
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dict_index_t* index) /* in: index */
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{
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ut_ad(index);
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return(index->search_info);
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}
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/*************************************************************************
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Updates the search info. */
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UNIV_INLINE
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void
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btr_search_info_update(
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/*===================*/
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dict_index_t* index, /* in: index of the cursor */
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btr_cur_t* cursor) /* in: cursor which was just positioned */
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{
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btr_search_t* info;
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#ifdef UNIV_SYNC_DEBUG
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ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
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ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
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#endif /* UNIV_SYNC_DEBUG */
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info = btr_search_get_info(index);
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info->hash_analysis++;
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if (info->hash_analysis < BTR_SEARCH_HASH_ANALYSIS) {
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/* Do nothing */
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return;
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}
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ut_ad(cursor->flag != BTR_CUR_HASH);
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btr_search_info_update_slow(info, cursor);
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}
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