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comments to Doxygen /** style like this:
/*****************************//**
This conversion was performed by the following command:
perl -i -e 'while(<ARGV>){if (m|^/\*{30}\**$|) {
s|\*{4}$|//**| if ++$com>1; $_ .= "\@file $ARGV\n" if $com==2}
print; if(eof){$.=0;undef $com}}' */*[ch] include/univ.i
213 lines
6.7 KiB
C
213 lines
6.7 KiB
C
/*****************************************************************************
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Copyright (c) 2007, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/trx0i_s.h
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INFORMATION SCHEMA innodb_trx, innodb_locks and
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innodb_lock_waits tables cache structures and public
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functions.
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Created July 17, 2007 Vasil Dimov
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*******************************************************/
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#ifndef trx0i_s_h
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#define trx0i_s_h
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#include "univ.i"
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#include "trx0types.h"
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#include "ut0ut.h"
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/* the maximum amount of memory that can be consumed by innodb_trx,
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innodb_locks and innodb_lock_waits information schema tables. */
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#define TRX_I_S_MEM_LIMIT 16777216 /* 16 MiB */
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/* the maximum length of a string that can be stored in
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i_s_locks_row_t::lock_data */
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#define TRX_I_S_LOCK_DATA_MAX_LEN 8192
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/* the maximum length of a string that can be stored in
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i_s_trx_row_t::trx_query */
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#define TRX_I_S_TRX_QUERY_MAX_LEN 1024
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typedef struct i_s_locks_row_struct i_s_locks_row_t;
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typedef struct i_s_hash_chain_struct i_s_hash_chain_t;
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/* Objects of this type are added to the hash table
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trx_i_s_cache_t::locks_hash */
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struct i_s_hash_chain_struct {
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i_s_locks_row_t* value;
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i_s_hash_chain_t* next;
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};
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/* This structure represents INFORMATION_SCHEMA.innodb_locks row */
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struct i_s_locks_row_struct {
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ullint lock_trx_id;
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const char* lock_mode;
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const char* lock_type;
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const char* lock_table;
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const char* lock_index;
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ulint lock_space;
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ulint lock_page;
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ulint lock_rec;
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const char* lock_data;
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/* The following are auxiliary and not included in the table */
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ullint lock_table_id;
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i_s_hash_chain_t hash_chain; /* this object is added to the hash
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table
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trx_i_s_cache_t::locks_hash */
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};
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/* This structure represents INFORMATION_SCHEMA.innodb_trx row */
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typedef struct i_s_trx_row_struct {
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ullint trx_id;
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const char* trx_state;
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ib_time_t trx_started;
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const i_s_locks_row_t* requested_lock_row;
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ib_time_t trx_wait_started;
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ullint trx_weight;
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ulint trx_mysql_thread_id;
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const char* trx_query;
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} i_s_trx_row_t;
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/* This structure represents INFORMATION_SCHEMA.innodb_lock_waits row */
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typedef struct i_s_lock_waits_row_struct {
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const i_s_locks_row_t* requested_lock_row;
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const i_s_locks_row_t* blocking_lock_row;
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} i_s_lock_waits_row_t;
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/* This type is opaque and is defined in trx/trx0i_s.c */
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typedef struct trx_i_s_cache_struct trx_i_s_cache_t;
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/* Auxiliary enum used by functions that need to select one of the
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INFORMATION_SCHEMA tables */
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enum i_s_table {
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I_S_INNODB_TRX,
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I_S_INNODB_LOCKS,
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I_S_INNODB_LOCK_WAITS
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};
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/* This is the intermediate buffer where data needed to fill the
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INFORMATION SCHEMA tables is fetched and later retrieved by the C++
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code in handler/i_s.cc. */
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extern trx_i_s_cache_t* trx_i_s_cache;
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/*******************************************************************//**
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Initialize INFORMATION SCHEMA trx related cache. */
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UNIV_INTERN
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void
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trx_i_s_cache_init(
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/*===============*/
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trx_i_s_cache_t* cache); /*!< out: cache to init */
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/*******************************************************************//**
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Issue a shared/read lock on the tables cache. */
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UNIV_INTERN
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void
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trx_i_s_cache_start_read(
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/*=====================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Release a shared/read lock on the tables cache. */
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UNIV_INTERN
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void
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trx_i_s_cache_end_read(
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/*===================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Issue an exclusive/write lock on the tables cache. */
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UNIV_INTERN
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void
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trx_i_s_cache_start_write(
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/*======================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Release an exclusive/write lock on the tables cache. */
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UNIV_INTERN
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void
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trx_i_s_cache_end_write(
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/*====================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Retrieves the number of used rows in the cache for a given
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INFORMATION SCHEMA table.
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@return number of rows */
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UNIV_INTERN
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ulint
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trx_i_s_cache_get_rows_used(
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/*========================*/
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trx_i_s_cache_t* cache, /*!< in: cache */
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enum i_s_table table); /*!< in: which table */
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/*******************************************************************//**
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Retrieves the nth row in the cache for a given INFORMATION SCHEMA
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table.
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@return row */
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UNIV_INTERN
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void*
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trx_i_s_cache_get_nth_row(
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/*======================*/
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trx_i_s_cache_t* cache, /*!< in: cache */
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enum i_s_table table, /*!< in: which table */
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ulint n); /*!< in: row number */
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/*******************************************************************//**
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Update the transactions cache if it has not been read for some time.
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@return 0 - fetched, 1 - not */
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UNIV_INTERN
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int
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trx_i_s_possibly_fetch_data_into_cache(
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/*===================================*/
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trx_i_s_cache_t* cache); /*!< in/out: cache */
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/*******************************************************************//**
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Returns TRUE if the data in the cache is truncated due to the memory
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limit posed by TRX_I_S_MEM_LIMIT.
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@return TRUE if truncated */
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UNIV_INTERN
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ibool
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trx_i_s_cache_is_truncated(
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/*=======================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/* The maximum length of a resulting lock_id_size in
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trx_i_s_create_lock_id(), not including the terminating '\0'.
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":%lu:%lu:%lu" -> 63 chars */
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#define TRX_I_S_LOCK_ID_MAX_LEN (TRX_ID_MAX_LEN + 63)
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/*******************************************************************//**
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Crafts a lock id string from a i_s_locks_row_t object. Returns its
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second argument. This function aborts if there is not enough space in
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lock_id. Be sure to provide at least TRX_I_S_LOCK_ID_MAX_LEN + 1 if you
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want to be 100% sure that it will not abort.
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@return resulting lock id */
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UNIV_INTERN
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char*
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trx_i_s_create_lock_id(
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/*===================*/
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const i_s_locks_row_t* row, /*!< in: innodb_locks row */
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char* lock_id,/*!< out: resulting lock_id */
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ulint lock_id_size);/*!< in: size of the lock id
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buffer */
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#endif /* trx0i_s_h */
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