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/*****************************************************************************
Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2021, MariaDB Corporation.
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/trx0types.h
Transaction system global type definitions
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#ifndef trx0types_h
#define trx0types_h
#include "ut0byte.h"
#include "ut0mutex.h"
#include <vector>
/** printf(3) format used for printing DB_TRX_ID and other system fields */
#define TRX_ID_FMT IB_ID_FMT
/** maximum length that a formatted trx_t::id could take, not including
the terminating NUL character. */
static const ulint TRX_ID_MAX_LEN = 17;
/** Space id of the transaction system page (the system tablespace) */
static const ulint TRX_SYS_SPACE = 0;
/** Page number of the transaction system page */
#define TRX_SYS_PAGE_NO FSP_TRX_SYS_PAGE_NO
/** Random value to check for corruption of trx_t */
static const ulint TRX_MAGIC_N = 91118598;
constexpr uint innodb_purge_threads_MAX= 32;
/** Transaction execution states when trx->state == TRX_STATE_ACTIVE */
enum trx_que_t {
TRX_QUE_RUNNING, /*!< transaction is running */
TRX_QUE_LOCK_WAIT, /*!< transaction is waiting for
a lock */
TRX_QUE_ROLLING_BACK, /*!< transaction is rolling back */
TRX_QUE_COMMITTING /*!< transaction is committing */
};
/** Transaction states (trx_t::state) */
enum trx_state_t {
TRX_STATE_NOT_STARTED,
TRX_STATE_ACTIVE,
/** XA PREPARE has been executed; only XA COMMIT or XA ROLLBACK
are possible */
TRX_STATE_PREPARED,
/** XA PREPARE transaction that was returned to ha_recover() */
TRX_STATE_PREPARED_RECOVERED,
TRX_STATE_COMMITTED_IN_MEMORY
};
/** Type of data dictionary operation */
enum trx_dict_op_t {
/** The transaction is not modifying the data dictionary. */
TRX_DICT_OP_NONE = 0,
/** The transaction is creating a table or an index, or
dropping a table. The table must be dropped in crash
recovery. This and TRX_DICT_OP_NONE are the only possible
operation modes in crash recovery. */
TRX_DICT_OP_TABLE = 1,
/** The transaction is creating or dropping an index in an
existing table. In crash recovery, the data dictionary
must be locked, but the table must not be dropped. */
TRX_DICT_OP_INDEX = 2
};
/** Memory objects */
/* @{ */
/** Transaction */
struct trx_t;
/** The locks and state of an active transaction */
struct trx_lock_t;
/** Rollback segment */
struct trx_rseg_t;
/** Transaction undo log */
struct trx_undo_t;
/** Rollback command node in a query graph */
struct roll_node_t;
/** Commit command node in a query graph */
struct commit_node_t;
/** SAVEPOINT command node in a query graph */
struct trx_named_savept_t;
/* @} */
/** Row identifier (DB_ROW_ID, DATA_ROW_ID) */
typedef ib_id_t row_id_t;
/** Transaction identifier (DB_TRX_ID, DATA_TRX_ID) */
typedef ib_id_t trx_id_t;
/** Rollback pointer (DB_ROLL_PTR, DATA_ROLL_PTR) */
typedef ib_id_t roll_ptr_t;
/** Undo number */
typedef ib_id_t undo_no_t;
/** Transaction savepoint */
struct trx_savept_t{
undo_no_t least_undo_no; /*!< least undo number to undo */
};
/** File objects */
/* @{ */
/** Undo segment header */
typedef byte trx_usegf_t;
/** Undo log header */
typedef byte trx_ulogf_t;
/** Undo log page header */
typedef byte trx_upagef_t;
/** Undo log record */
typedef byte trx_undo_rec_t;
/* @} */
typedef ib_mutex_t RsegMutex;
typedef ib_mutex_t TrxMutex;
typedef ib_mutex_t PQMutex;
typedef ib_mutex_t TrxSysMutex;
typedef std::vector<trx_id_t, ut_allocator<trx_id_t> > trx_ids_t;
#endif /* trx0types_h */
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