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mariadb/storage/innobase/include/trx0sys.h
Vladislav Vaintroub 47e18af906 MDEV-27494 Rename .ic files to .inl
2022-01-17 16:41:51 +01:00

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/*****************************************************************************
Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2019, 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/trx0sys.h
Transaction system
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#ifndef trx0sys_h
#define trx0sys_h
#include "buf0buf.h"
#include "fil0fil.h"
#include "trx0types.h"
#include "mem0mem.h"
#include "mtr0mtr.h"
#include "ut0byte.h"
#include "mem0mem.h"
#include "ut0lst.h"
#include "read0types.h"
#include "page0types.h"
#include "ut0mutex.h"
#include "trx0trx.h"
#ifdef WITH_WSREP
#include "trx0xa.h"
#endif /* WITH_WSREP */
typedef UT_LIST_BASE_NODE_T(trx_t) trx_ut_list_t;
// Forward declaration
class MVCC;
class ReadView;
/** The transaction system */
extern trx_sys_t* trx_sys;
/** Checks if a page address is the trx sys header page.
@param[in] page_id page id
@return true if trx sys header page */
inline bool trx_sys_hdr_page(const page_id_t page_id);
/** Initialize the transaction system main-memory data structures. */
void trx_sys_init_at_db_start();
/*****************************************************************//**
Creates the trx_sys instance and initializes purge_queue and mutex. */
void
trx_sys_create(void);
/*================*/
/*****************************************************************//**
Creates and initializes the transaction system at the database creation. */
void
trx_sys_create_sys_pages(void);
/*==========================*/
/** @return an unallocated rollback segment slot in the TRX_SYS header
@retval ULINT_UNDEFINED if not found */
ulint
trx_sysf_rseg_find_free(mtr_t* mtr);
/**********************************************************************//**
Gets a pointer to the transaction system file copy and x-locks its page.
@return pointer to system file copy, page x-locked */
UNIV_INLINE
trx_sysf_t*
trx_sysf_get(
/*=========*/
mtr_t* mtr); /*!< in: mtr */
/*****************************************************************//**
Gets the space of the nth rollback segment slot in the trx system
file copy.
@return space id */
UNIV_INLINE
ulint
trx_sysf_rseg_get_space(
/*====================*/
trx_sysf_t* sys_header, /*!< in: trx sys file copy */
ulint i, /*!< in: slot index == rseg id */
mtr_t* mtr); /*!< in: mtr */
/*****************************************************************//**
Gets the page number of the nth rollback segment slot in the trx system
file copy.
@return page number, FIL_NULL if slot unused */
UNIV_INLINE
ulint
trx_sysf_rseg_get_page_no(
/*======================*/
trx_sysf_t* sys_header, /*!< in: trx sys file copy */
ulint i, /*!< in: slot index == rseg id */
mtr_t* mtr); /*!< in: mtr */
/*****************************************************************//**
Sets the space id of the nth rollback segment slot in the trx system
file copy. */
UNIV_INLINE
void
trx_sysf_rseg_set_space(
/*====================*/
trx_sysf_t* sys_header, /*!< in: trx sys file copy */
ulint i, /*!< in: slot index == rseg id */
ulint space, /*!< in: space id */
mtr_t* mtr); /*!< in: mtr */
/*****************************************************************//**
Sets the page number of the nth rollback segment slot in the trx system
file copy. */
UNIV_INLINE
void
trx_sysf_rseg_set_page_no(
/*======================*/
trx_sysf_t* sys_header, /*!< in: trx sys file copy */
ulint i, /*!< in: slot index == rseg id */
ulint page_no, /*!< in: page number, FIL_NULL if
the slot is reset to unused */
mtr_t* mtr); /*!< in: mtr */
/*****************************************************************//**
Allocates a new transaction id.
@return new, allocated trx id */
UNIV_INLINE
trx_id_t
trx_sys_get_new_trx_id();
/*===================*/
/*****************************************************************//**
Determines the maximum transaction id.
@return maximum currently allocated trx id; will be stale after the
next call to trx_sys_get_new_trx_id() */
UNIV_INLINE
trx_id_t
trx_sys_get_max_trx_id(void);
/*========================*/
#ifdef UNIV_DEBUG
/* Flag to control TRX_RSEG_N_SLOTS behavior debugging. */
extern uint trx_rseg_n_slots_debug;
#endif
/*****************************************************************//**
Writes a trx id to an index page. In case that the id size changes in
some future version, this function should be used instead of
mach_write_... */
UNIV_INLINE
void
trx_write_trx_id(
/*=============*/
byte* ptr, /*!< in: pointer to memory where written */
trx_id_t id); /*!< in: id */
/*****************************************************************//**
Reads a trx id from an index page. In case that the id size changes in
some future version, this function should be used instead of
mach_read_...
@return id */
UNIV_INLINE
trx_id_t
trx_read_trx_id(
/*============*/
const byte* ptr); /*!< in: pointer to memory from where to read */
/****************************************************************//**
Looks for the trx instance with the given id in the rw trx_list.
@return the trx handle or NULL if not found */
UNIV_INLINE
trx_t*
trx_get_rw_trx_by_id(
/*=================*/
trx_id_t trx_id);/*!< in: trx id to search for */
/****************************************************************//**
Returns the minimum trx id in rw trx list. This is the smallest id for which
the trx can possibly be active. (But, you must look at the trx->state to
find out if the minimum trx id transaction itself is active, or already
committed.)
@return the minimum trx id, or trx_sys->max_trx_id if the trx list is empty */
UNIV_INLINE
trx_id_t
trx_rw_min_trx_id(void);
/*===================*/
/** Look up a rw transaction with the given id.
@param[in] trx_id transaction identifier
@param[out] corrupt flag that will be set if trx_id is corrupted
@return transaction; its state should be rechecked after acquiring trx_t::mutex
@retval NULL if there is no transaction identified by trx_id. */
inline trx_t* trx_rw_is_active_low(trx_id_t trx_id, bool* corrupt);
/** Look up a rw transaction with the given id.
@param[in] trx_id transaction identifier
@param[out] corrupt flag that will be set if trx_id is corrupted
@param[in] ref_count whether to increment trx->n_ref
@return transaction; its state should be rechecked after acquiring trx_t::mutex
@retval NULL if there is no active transaction identified by trx_id. */
inline trx_t* trx_rw_is_active(trx_id_t trx_id, bool* corrupt, bool ref_count);
#if defined UNIV_DEBUG || defined UNIV_BLOB_LIGHT_DEBUG
/***********************************************************//**
Assert that a transaction has been recovered.
@return TRUE */
UNIV_INLINE
ibool
trx_assert_recovered(
/*=================*/
trx_id_t trx_id) /*!< in: transaction identifier */
MY_ATTRIBUTE((warn_unused_result));
#endif /* UNIV_DEBUG || UNIV_BLOB_LIGHT_DEBUG */
/*****************************************************************//**
Updates the offset information about the end of the MySQL binlog entry
which corresponds to the transaction just being committed. In a MySQL
replication slave updates the latest master binlog position up to which
replication has proceeded. */
void
trx_sys_update_mysql_binlog_offset(
/*===============================*/
const char* file_name,/*!< in: MySQL log file name */
int64_t offset, /*!< in: position in that log file */
trx_sysf_t* sys_header, /*!< in: trx sys header */
mtr_t* mtr); /*!< in: mtr */
/** Display the MySQL binlog offset info if it is present in the trx
system header. */
void
trx_sys_print_mysql_binlog_offset();
#ifdef WITH_WSREP
/** Update WSREP XID info in sys_header of TRX_SYS_PAGE_NO = 5.
@param[in] xid Transaction XID
@param[in,out] sys_header sys_header
@param[in] mtr minitransaction */
UNIV_INTERN
void
trx_sys_update_wsrep_checkpoint(
const XID* xid,
trx_sysf_t* sys_header,
mtr_t* mtr);
/** Read WSREP checkpoint XID from sys header.
@param[out] xid WSREP XID
@return whether the checkpoint was present */
UNIV_INTERN
bool
trx_sys_read_wsrep_checkpoint(XID* xid);
#endif /* WITH_WSREP */
/** Initializes the tablespace tag system. */
void
trx_sys_file_format_init(void);
/*==========================*/
/*****************************************************************//**
Closes the tablespace tag system. */
void
trx_sys_file_format_close(void);
/*===========================*/
/********************************************************************//**
Tags the system table space with minimum format id if it has not been
tagged yet.
WARNING: This function is only called during the startup and AFTER the
redo log application during recovery has finished. */
void
trx_sys_file_format_tag_init(void);
/*==============================*/
/*****************************************************************//**
Shutdown/Close the transaction system. */
void
trx_sys_close(void);
/*===============*/
/*****************************************************************//**
Get the name representation of the file format from its id.
@return pointer to the name */
const char*
trx_sys_file_format_id_to_name(
/*===========================*/
const ulint id); /*!< in: id of the file format */
/*****************************************************************//**
Set the file format id unconditionally except if it's already the
same value.
@return TRUE if value updated */
ibool
trx_sys_file_format_max_set(
/*========================*/
ulint format_id, /*!< in: file format id */
const char** name); /*!< out: max file format name or
NULL if not needed. */
/** Create the rollback segments.
@return whether the creation succeeded */
bool
trx_sys_create_rsegs();
/*****************************************************************//**
Get the number of transaction in the system, independent of their state.
@return count of transactions in trx_sys_t::trx_list */
UNIV_INLINE
ulint
trx_sys_get_n_rw_trx(void);
/*======================*/
/*********************************************************************
Check if there are any active (non-prepared) transactions.
@return total number of active transactions or 0 if none */
ulint
trx_sys_any_active_transactions(void);
/*=================================*/
/*****************************************************************//**
Get the name representation of the file format from its id.
@return pointer to the max format name */
const char*
trx_sys_file_format_max_get(void);
/*=============================*/
/*****************************************************************//**
Check for the max file format tag stored on disk.
@return DB_SUCCESS or error code */
dberr_t
trx_sys_file_format_max_check(
/*==========================*/
ulint max_format_id); /*!< in: the max format id to check */
/********************************************************************//**
Update the file format tag in the system tablespace only if the given
format id is greater than the known max id.
@return TRUE if format_id was bigger than the known max id */
ibool
trx_sys_file_format_max_upgrade(
/*============================*/
const char** name, /*!< out: max file format name */
ulint format_id); /*!< in: file format identifier */
/*****************************************************************//**
Get the name representation of the file format from its id.
@return pointer to the name */
const char*
trx_sys_file_format_id_to_name(
/*===========================*/
const ulint id); /*!< in: id of the file format */
/**
Add the transaction to the RW transaction set
@param trx transaction instance to add */
UNIV_INLINE
void
trx_sys_rw_trx_add(trx_t* trx);
#ifdef UNIV_DEBUG
/*************************************************************//**
Validate the trx_sys_t::rw_trx_list.
@return true if the list is valid */
bool
trx_sys_validate_trx_list();
/*========================*/
#endif /* UNIV_DEBUG */
/** The automatically created system rollback segment has this id */
#define TRX_SYS_SYSTEM_RSEG_ID 0
/** The offset of the transaction system header on the page */
#define TRX_SYS FSEG_PAGE_DATA
/** Transaction system header */
/*------------------------------------------------------------- @{ */
#define TRX_SYS_TRX_ID_STORE 0 /*!< the maximum trx id or trx
number modulo
TRX_SYS_TRX_ID_UPDATE_MARGIN
written to a file page by any
transaction; the assignment of
transaction ids continues from
this number rounded up by
TRX_SYS_TRX_ID_UPDATE_MARGIN
plus
TRX_SYS_TRX_ID_UPDATE_MARGIN
when the database is
started */
#define TRX_SYS_FSEG_HEADER 8 /*!< segment header for the
tablespace segment the trx
system is created into */
#define TRX_SYS_RSEGS (8 + FSEG_HEADER_SIZE)
/*!< the start of the array of
rollback segment specification
slots */
/*------------------------------------------------------------- @} */
/* Max number of rollback segments: the number of segment specification slots
in the transaction system array; rollback segment id must fit in one (signed)
byte, therefore 128; each slot is currently 8 bytes in size. If you want
to raise the level to 256 then you will need to fix some assertions that
impose the 7 bit restriction. e.g., mach_write_to_3() */
#define TRX_SYS_N_RSEGS 128
/** Maximum number of undo tablespaces (not counting the system tablespace) */
#define TRX_SYS_MAX_UNDO_SPACES (TRX_SYS_N_RSEGS - 1)
/** Maximum length of MySQL binlog file name, in bytes. */
#define TRX_SYS_MYSQL_LOG_NAME_LEN 512
/** Contents of TRX_SYS_MYSQL_LOG_MAGIC_N_FLD */
#define TRX_SYS_MYSQL_LOG_MAGIC_N 873422344
#if UNIV_PAGE_SIZE_MIN < 4096
# error "UNIV_PAGE_SIZE_MIN < 4096"
#endif
/** The offset of the MySQL binlog offset info in the trx system header */
#define TRX_SYS_MYSQL_LOG_INFO (UNIV_PAGE_SIZE - 1000)
#define TRX_SYS_MYSQL_LOG_MAGIC_N_FLD 0 /*!< magic number which is
TRX_SYS_MYSQL_LOG_MAGIC_N
if we have valid data in the
MySQL binlog info */
#define TRX_SYS_MYSQL_LOG_OFFSET 4 /*!< the 64-bit offset
within that file */
#define TRX_SYS_MYSQL_LOG_NAME 12 /*!< MySQL log file name */
/** Memory map TRX_SYS_PAGE_NO = 5 when UNIV_PAGE_SIZE = 4096
0...37 FIL_HEADER
38...45 TRX_SYS_TRX_ID_STORE
46...55 TRX_SYS_FSEG_HEADER (FSEG_HEADER_SIZE == 10)
56 TRX_SYS_RSEGS
56...59 TRX_SYS_RSEG_SPACE for slot 0
60...63 TRX_SYS_RSEG_PAGE_NO for slot 0
64...67 TRX_SYS_RSEG_SPACE for slot 1
68...71 TRX_SYS_RSEG_PAGE_NO for slot 1
....
594..597 TRX_SYS_RSEG_SPACE for slot 72
598..601 TRX_SYS_RSEG_PAGE_NO for slot 72
...
...1063 TRX_SYS_RSEG_PAGE_NO for slot 126
(UNIV_PAGE_SIZE-3500 WSREP ::: FAIL would overwrite undo tablespace
space_id, page_no pairs :::)
596 TRX_SYS_WSREP_XID_INFO TRX_SYS_WSREP_XID_MAGIC_N_FLD
600 TRX_SYS_WSREP_XID_FORMAT
604 TRX_SYS_WSREP_XID_GTRID_LEN
608 TRX_SYS_WSREP_XID_BQUAL_LEN
612 TRX_SYS_WSREP_XID_DATA (len = 128)
739 TRX_SYS_WSREP_XID_DATA_END
FIXED WSREP XID info offsets for 4k page size 10.0.32-galera
(UNIV_PAGE_SIZE-2500)
1596 TRX_SYS_WSREP_XID_INFO TRX_SYS_WSREP_XID_MAGIC_N_FLD
1600 TRX_SYS_WSREP_XID_FORMAT
1604 TRX_SYS_WSREP_XID_GTRID_LEN
1608 TRX_SYS_WSREP_XID_BQUAL_LEN
1612 TRX_SYS_WSREP_XID_DATA (len = 128)
1739 TRX_SYS_WSREP_XID_DATA_END
(UNIV_PAGE_SIZE - 2000 MYSQL MASTER LOG)
2096 TRX_SYS_MYSQL_MASTER_LOG_INFO TRX_SYS_MYSQL_LOG_MAGIC_N_FLD
2100 TRX_SYS_MYSQL_LOG_OFFSET_HIGH
2104 TRX_SYS_MYSQL_LOG_OFFSET_LOW
2108 TRX_SYS_MYSQL_LOG_NAME
(UNIV_PAGE_SIZE - 1000 MYSQL LOG)
3096 TRX_SYS_MYSQL_LOG_INFO TRX_SYS_MYSQL_LOG_MAGIC_N_FLD
3100 TRX_SYS_MYSQL_LOG_OFFSET_HIGH
3104 TRX_SYS_MYSQL_LOG_OFFSET_LOW
3108 TRX_SYS_MYSQL_LOG_NAME
(UNIV_PAGE_SIZE - 200 DOUBLEWRITE)
3896 TRX_SYS_DOUBLEWRITE TRX_SYS_DOUBLEWRITE_FSEG
3906 TRX_SYS_DOUBLEWRITE_MAGIC
3910 TRX_SYS_DOUBLEWRITE_BLOCK1
3914 TRX_SYS_DOUBLEWRITE_BLOCK2
3918 TRX_SYS_DOUBLEWRITE_REPEAT
3930 TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N
(UNIV_PAGE_SIZE - 8, TAILER)
4088..4096 FIL_TAILER
*/
#ifdef WITH_WSREP
/** The offset to WSREP XID headers */
#define TRX_SYS_WSREP_XID_INFO std::max(srv_page_size - 3500, 1596UL)
#define TRX_SYS_WSREP_XID_MAGIC_N_FLD 0
#define TRX_SYS_WSREP_XID_MAGIC_N 0x77737265
/** XID field: formatID, gtrid_len, bqual_len, xid_data */
#define TRX_SYS_WSREP_XID_LEN (4 + 4 + 4 + XIDDATASIZE)
#define TRX_SYS_WSREP_XID_FORMAT 4
#define TRX_SYS_WSREP_XID_GTRID_LEN 8
#define TRX_SYS_WSREP_XID_BQUAL_LEN 12
#define TRX_SYS_WSREP_XID_DATA 16
#endif /* WITH_WSREP*/
/** Doublewrite buffer */
/* @{ */
/** The offset of the doublewrite buffer header on the trx system header page */
#define TRX_SYS_DOUBLEWRITE (UNIV_PAGE_SIZE - 200)
/*-------------------------------------------------------------*/
#define TRX_SYS_DOUBLEWRITE_FSEG 0 /*!< fseg header of the fseg
containing the doublewrite
buffer */
#define TRX_SYS_DOUBLEWRITE_MAGIC FSEG_HEADER_SIZE
/*!< 4-byte magic number which
shows if we already have
created the doublewrite
buffer */
#define TRX_SYS_DOUBLEWRITE_BLOCK1 (4 + FSEG_HEADER_SIZE)
/*!< page number of the
first page in the first
sequence of 64
(= FSP_EXTENT_SIZE) consecutive
pages in the doublewrite
buffer */
#define TRX_SYS_DOUBLEWRITE_BLOCK2 (8 + FSEG_HEADER_SIZE)
/*!< page number of the
first page in the second
sequence of 64 consecutive
pages in the doublewrite
buffer */
#define TRX_SYS_DOUBLEWRITE_REPEAT 12 /*!< we repeat
TRX_SYS_DOUBLEWRITE_MAGIC,
TRX_SYS_DOUBLEWRITE_BLOCK1,
TRX_SYS_DOUBLEWRITE_BLOCK2
so that if the trx sys
header is half-written
to disk, we still may
be able to recover the
information */
/** If this is not yet set to TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N,
we must reset the doublewrite buffer, because starting from 4.1.x the
space id of a data page is stored into
FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID. */
#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED (24 + FSEG_HEADER_SIZE)
/*-------------------------------------------------------------*/
/** Contents of TRX_SYS_DOUBLEWRITE_MAGIC */
#define TRX_SYS_DOUBLEWRITE_MAGIC_N 536853855
/** Contents of TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED */
#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N 1783657386
/** Size of the doublewrite block in pages */
#define TRX_SYS_DOUBLEWRITE_BLOCK_SIZE FSP_EXTENT_SIZE
/* @} */
/** File format tag */
/* @{ */
/** The offset of the file format tag on the trx system header page
(TRX_SYS_PAGE_NO of TRX_SYS_SPACE) */
#define TRX_SYS_FILE_FORMAT_TAG (UNIV_PAGE_SIZE - 16)
/** Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format
identifier is added to this constant. */
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW 3645922177UL
/** Contents of TRX_SYS_FILE_FORMAT_TAG+4 when valid */
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH 2745987765UL
/** Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format
identifier is added to this 64-bit constant. */
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N \
((ib_uint64_t) TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH << 32 \
| TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW)
/* @} */
/** The transaction system central memory data structure. */
struct trx_sys_t {
TrxSysMutex mutex; /*!< mutex protecting most fields in
this structure except when noted
otherwise */
MVCC* mvcc; /*!< Multi version concurrency control
manager */
volatile trx_id_t
max_trx_id; /*!< The smallest number not yet
assigned as a transaction id or
transaction number. This is declared
volatile because it can be accessed
without holding any mutex during
AC-NL-RO view creation. */
trx_ut_list_t serialisation_list;
/*!< Ordered on trx_t::no of all the
currenrtly active RW transactions */
#ifdef UNIV_DEBUG
trx_id_t rw_max_trx_id; /*!< Max trx id of read-write
transactions which exist or existed */
#endif /* UNIV_DEBUG */
/** Avoid false sharing */
const char pad1[CACHE_LINE_SIZE];
trx_ut_list_t rw_trx_list; /*!< List of active and committed in
memory read-write transactions, sorted
on trx id, biggest first. Recovered
transactions are always on this list. */
/** Avoid false sharing */
const char pad2[CACHE_LINE_SIZE];
trx_ut_list_t mysql_trx_list; /*!< List of transactions created
for MySQL. All user transactions are
on mysql_trx_list. The rw_trx_list
can contain system transactions and
recovered transactions that will not
be in the mysql_trx_list.
mysql_trx_list may additionally contain
transactions that have not yet been
started in InnoDB. */
trx_ids_t rw_trx_ids; /*!< Array of Read write transaction IDs
for MVCC snapshot. A ReadView would take
a snapshot of these transactions whose
changes are not visible to it. We should
remove transactions from the list before
committing in memory and releasing locks
to ensure right order of removal and
consistent snapshot. */
/** Avoid false sharing */
const char pad3[CACHE_LINE_SIZE];
/** Temporary rollback segments */
trx_rseg_t* temp_rsegs[TRX_SYS_N_RSEGS];
/** Avoid false sharing */
const char pad4[CACHE_LINE_SIZE];
trx_rseg_t* rseg_array[TRX_SYS_N_RSEGS];
/*!< Pointer array to rollback
segments; NULL if slot not in use;
created and destroyed in
single-threaded mode; not protected
by any mutex, because it is read-only
during multi-threaded operation */
ulint rseg_history_len;
/*!< Length of the TRX_RSEG_HISTORY
list (update undo logs for committed
transactions), protected by
rseg->mutex */
TrxIdSet rw_trx_set; /*!< Mapping from transaction id
to transaction instance */
};
/** When a trx id which is zero modulo this number (which must be a power of
two) is assigned, the field TRX_SYS_TRX_ID_STORE on the transaction system
page is updated */
#define TRX_SYS_TRX_ID_WRITE_MARGIN ((trx_id_t) 256)
/** Test if trx_sys->mutex is owned. */
#define trx_sys_mutex_own() (trx_sys->mutex.is_owned())
/** Acquire the trx_sys->mutex. */
#define trx_sys_mutex_enter() do { \
mutex_enter(&trx_sys->mutex); \
} while (0)
/** Release the trx_sys->mutex. */
#define trx_sys_mutex_exit() do { \
trx_sys->mutex.exit(); \
} while (0)
#include "trx0sys.inl"
#endif
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