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/*****************************************************************************
Copyright (c) 1994, 2011, Oracle and/or its affiliates. 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.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/********************************************************************//**
@file include/ha0ha.ic
The hash table with external chains
Created 8/18/1994 Heikki Tuuri
*************************************************************************/
#include "ut0rnd.h"
#include "mem0mem.h"
#include "btr0types.h"
/***********************************************************//**
Deletes a hash node. */
UNIV_INTERN
void
ha_delete_hash_node(
/*================*/
hash_table_t* table, /*!< in: hash table */
ha_node_t* del_node); /*!< in: node to be deleted */
/******************************************************************//**
Gets a hash node data.
@return pointer to the data */
UNIV_INLINE
const rec_t*
ha_node_get_data(
/*=============*/
const ha_node_t* node) /*!< in: hash chain node */
{
return(node->data);
}
/******************************************************************//**
Sets hash node data. */
UNIV_INLINE
void
ha_node_set_data_func(
/*==================*/
ha_node_t* node, /*!< in: hash chain node */
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
buf_block_t* block, /*!< in: buffer block containing the data */
#endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
const rec_t* data) /*!< in: pointer to the data */
{
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
node->block = block;
#endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
node->data = data;
}
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
/** Sets hash node data.
@param n in: hash chain node
@param b in: buffer block containing the data
@param d in: pointer to the data */
# define ha_node_set_data(n,b,d) ha_node_set_data_func(n,b,d)
#else /* UNIV_AHI_DEBUG || UNIV_DEBUG */
/** Sets hash node data.
@param n in: hash chain node
@param b in: buffer block containing the data
@param d in: pointer to the data */
# define ha_node_set_data(n,b,d) ha_node_set_data_func(n,d)
#endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
/******************************************************************//**
Gets the next node in a hash chain.
@return next node, NULL if none */
UNIV_INLINE
ha_node_t*
ha_chain_get_next(
/*==============*/
ha_node_t* node) /*!< in: hash chain node */
{
return(node->next);
}
/******************************************************************//**
Gets the first node in a hash chain.
@return first node, NULL if none */
UNIV_INLINE
ha_node_t*
ha_chain_get_first(
/*===============*/
hash_table_t* table, /*!< in: hash table */
ulint fold) /*!< in: fold value determining the chain */
{
return((ha_node_t*)
hash_get_nth_cell(table, hash_calc_hash(fold, table))->node);
}
/*************************************************************//**
Looks for an element in a hash table.
@return pointer to the data of the first hash table node in chain
having the fold number, NULL if not found */
UNIV_INLINE
const rec_t*
ha_search_and_get_data(
/*===================*/
hash_table_t* table, /*!< in: hash table */
ulint fold) /*!< in: folded value of the searched data */
{
ha_node_t* node;
ASSERT_HASH_MUTEX_OWN(table, fold);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
#endif /* UNIV_SYNC_DEBUG */
ut_ad(btr_search_enabled);
node = ha_chain_get_first(table, fold);
while (node) {
if (node->fold == fold) {
return(node->data);
}
node = ha_chain_get_next(node);
}
return(NULL);
}
/*********************************************************//**
Looks for an element when we know the pointer to the data.
@return pointer to the hash table node, NULL if not found in the table */
UNIV_INLINE
ha_node_t*
ha_search_with_data(
/*================*/
hash_table_t* table, /*!< in: hash table */
ulint fold, /*!< in: folded value of the searched data */
const rec_t* data) /*!< in: pointer to the data */
{
ha_node_t* node;
ASSERT_HASH_MUTEX_OWN(table, fold);
ut_ad(btr_search_enabled);
node = ha_chain_get_first(table, fold);
while (node) {
if (node->data == data) {
return(node);
}
node = ha_chain_get_next(node);
}
return(NULL);
}
/*********************************************************//**
Looks for an element when we know the pointer to the data, and deletes
it from the hash table, if found.
@return TRUE if found */
UNIV_INLINE
ibool
ha_search_and_delete_if_found(
/*==========================*/
hash_table_t* table, /*!< in: hash table */
ulint fold, /*!< in: folded value of the searched data */
const rec_t* data) /*!< in: pointer to the data */
{
ha_node_t* node;
ASSERT_HASH_MUTEX_OWN(table, fold);
#ifdef UNIV_SYNC_DEBUG
ut_ad(rw_lock_own(&btr_search_latch, RW_LOCK_EX));
#endif /* UNIV_SYNC_DEBUG */
ut_ad(btr_search_enabled);
node = ha_search_with_data(table, fold, data);
if (node) {
ha_delete_hash_node(table, node);
return(TRUE);
}
return(FALSE);
}
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