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/*****************************************************************************
Copyright (c) 1997, 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
*****************************************************************************/
/**************************************************//**
@file ha/hash0hash.c
The simple hash table utility
Created 5/20/1997 Heikki Tuuri
*******************************************************/
#include "hash0hash.h"
#ifdef UNIV_NONINL
#include "hash0hash.ic"
#endif
#include "mem0mem.h"
#ifndef UNIV_HOTBACKUP
/************************************************************//**
Reserves the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_enter(
/*=============*/
hash_table_t* table, /*!< in: hash table */
ulint fold) /*!< in: fold */
{
mutex_enter(hash_get_mutex(table, fold));
}
/************************************************************//**
Releases the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_exit(
/*============*/
hash_table_t* table, /*!< in: hash table */
ulint fold) /*!< in: fold */
{
mutex_exit(hash_get_mutex(table, fold));
}
/************************************************************//**
Reserves all the mutexes of a hash table, in an ascending order. */
UNIV_INTERN
void
hash_mutex_enter_all(
/*=================*/
hash_table_t* table) /*!< in: hash table */
{
ulint i;
for (i = 0; i < table->n_mutexes; i++) {
mutex_enter(table->mutexes + i);
}
}
/************************************************************//**
Releases all the mutexes of a hash table. */
UNIV_INTERN
void
hash_mutex_exit_all(
/*================*/
hash_table_t* table) /*!< in: hash table */
{
ulint i;
for (i = 0; i < table->n_mutexes; i++) {
mutex_exit(table->mutexes + i);
}
}
#endif /* !UNIV_HOTBACKUP */
/*************************************************************//**
Creates a hash table with >= n array cells. The actual number of cells is
chosen to be a prime number slightly bigger than n.
@return own: created table */
UNIV_INTERN
hash_table_t*
hash_create(
/*========*/
ulint n) /*!< in: number of array cells */
{
hash_cell_t* array;
ulint prime;
hash_table_t* table;
prime = ut_find_prime(n);
table = mem_alloc(sizeof(hash_table_t));
array = ut_malloc(sizeof(hash_cell_t) * prime);
table->array = array;
table->n_cells = prime;
#ifndef UNIV_HOTBACKUP
# if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
table->adaptive = FALSE;
# endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
table->n_mutexes = 0;
table->mutexes = NULL;
table->heaps = NULL;
#endif /* !UNIV_HOTBACKUP */
table->heap = NULL;
table->magic_n = HASH_TABLE_MAGIC_N;
/* Initialize the cell array */
hash_table_clear(table);
return(table);
}
/*************************************************************//**
Frees a hash table. */
UNIV_INTERN
void
hash_table_free(
/*============*/
hash_table_t* table) /*!< in, own: hash table */
{
#ifndef UNIV_HOTBACKUP
ut_a(table->mutexes == NULL);
#endif /* !UNIV_HOTBACKUP */
ut_free(table->array);
mem_free(table);
}
#ifndef UNIV_HOTBACKUP
/*************************************************************//**
Creates a mutex array to protect a hash table. */
UNIV_INTERN
void
hash_create_mutexes_func(
/*=====================*/
hash_table_t* table, /*!< in: hash table */
#ifdef UNIV_SYNC_DEBUG
ulint sync_level, /*!< in: latching order level of the
mutexes: used in the debug version */
#endif /* UNIV_SYNC_DEBUG */
ulint n_mutexes) /*!< in: number of mutexes, must be a
power of 2 */
{
ulint i;
ut_a(n_mutexes > 0);
ut_a(ut_is_2pow(n_mutexes));
table->mutexes = mem_alloc(n_mutexes * sizeof(mutex_t));
for (i = 0; i < n_mutexes; i++) {
mutex_create(table->mutexes + i, sync_level);
}
table->n_mutexes = n_mutexes;
}
#endif /* !UNIV_HOTBACKUP */
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