mirror of
https://github.com/MariaDB/server.git
synced 2025-01-22 14:54:20 +01:00
7736c6fe08
* Remove old Innobase copyright lines from C source files * Add a reference to the GPLv2 license as recommended by the lawyers at Oracle Legal [Step 4/28]
83 lines
2.4 KiB
Text
83 lines
2.4 KiB
Text
/*****************************************************************************
|
|
|
|
Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free Software
|
|
Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/************************************************************************
|
|
The index tree adaptive search
|
|
|
|
Created 2/17/1996 Heikki Tuuri
|
|
*************************************************************************/
|
|
|
|
#include "dict0mem.h"
|
|
#include "btr0cur.h"
|
|
#include "buf0buf.h"
|
|
|
|
/*************************************************************************
|
|
Updates the search info. */
|
|
UNIV_INTERN
|
|
void
|
|
btr_search_info_update_slow(
|
|
/*========================*/
|
|
btr_search_t* info, /* in/out: search info */
|
|
btr_cur_t* cursor);/* in: cursor which was just positioned */
|
|
|
|
/************************************************************************
|
|
Returns search info for an index. */
|
|
UNIV_INLINE
|
|
btr_search_t*
|
|
btr_search_get_info(
|
|
/*================*/
|
|
/* out: search info; search mutex reserved */
|
|
dict_index_t* index) /* in: index */
|
|
{
|
|
ut_ad(index);
|
|
|
|
return(index->search_info);
|
|
}
|
|
|
|
/*************************************************************************
|
|
Updates the search info. */
|
|
UNIV_INLINE
|
|
void
|
|
btr_search_info_update(
|
|
/*===================*/
|
|
dict_index_t* index, /* in: index of the cursor */
|
|
btr_cur_t* cursor) /* in: cursor which was just positioned */
|
|
{
|
|
btr_search_t* info;
|
|
|
|
#ifdef UNIV_SYNC_DEBUG
|
|
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
|
|
ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
|
|
#endif /* UNIV_SYNC_DEBUG */
|
|
|
|
info = btr_search_get_info(index);
|
|
|
|
info->hash_analysis++;
|
|
|
|
if (info->hash_analysis < BTR_SEARCH_HASH_ANALYSIS) {
|
|
|
|
/* Do nothing */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
ut_ad(cursor->flag != BTR_CUR_HASH);
|
|
|
|
btr_search_info_update_slow(info, cursor);
|
|
}
|