Drizzled Public API Documentation

trx0sys.h File Reference
#include "univ.i"
#include "trx0types.h"
#include "fsp0types.h"
#include "fil0fil.h"
#include "buf0buf.h"
#include "mtr0mtr.h"
#include "ut0byte.h"
#include "mem0mem.h"
#include "sync0sync.h"
#include "ut0lst.h"
#include "read0types.h"
#include "page0types.h"
#include <drizzled/atomics.h>
#include "fsp0fsp.h"

Go to the source code of this file.

Classes

struct  trx_doublewrite_struct
 
struct  trx_sys_struct
 

Macros

#define trx0sys_h
 
#define TRX_SYS_SYSTEM_RSEG_ID   0
 
#define TRX_SYS_SPACE   0 /* the SYSTEM tablespace */
 
#define TRX_SYS_PAGE_NO   FSP_TRX_SYS_PAGE_NO
 
#define TRX_SYS   FSEG_PAGE_DATA
 
#define TRX_SYS_TRX_ID_STORE   0
 
#define TRX_SYS_FSEG_HEADER   8
 
#define TRX_SYS_RSEGS   (8 + FSEG_HEADER_SIZE)
 
#define TRX_SYS_N_RSEGS   128
 
#define TRX_SYS_OLD_N_RSEGS   256
 
#define TRX_SYS_MYSQL_LOG_NAME_LEN   512
 
#define TRX_SYS_MYSQL_LOG_MAGIC_N   873422344
 
#define TRX_SYS_MYSQL_MASTER_LOG_INFO   (UNIV_PAGE_SIZE - 2000)
 
#define TRX_SYS_DRIZZLE_LOG_INFO   (UNIV_PAGE_SIZE - 1000)
 
#define TRX_SYS_DRIZZLE_MAX_COMMIT_ID   8
 
#define TRX_SYS_DRIZZLE_LOG_NAME   12
 
#define TRX_SYS_TRX_ID_WRITE_MARGIN   256
 
#define TRX_SYS_DOUBLEWRITE   (UNIV_PAGE_SIZE - 200)
 
#define TRX_SYS_DOUBLEWRITE_FSEG   0
 
#define TRX_SYS_DOUBLEWRITE_MAGIC   FSEG_HEADER_SIZE
 
#define TRX_SYS_DOUBLEWRITE_BLOCK1   (4 + FSEG_HEADER_SIZE)
 
#define TRX_SYS_DOUBLEWRITE_BLOCK2   (8 + FSEG_HEADER_SIZE)
 
#define TRX_SYS_DOUBLEWRITE_REPEAT   12
 
#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED   (24 + FSEG_HEADER_SIZE)
 
#define TRX_SYS_DOUBLEWRITE_MAGIC_N   536853855
 
#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N   1783657386
 
#define TRX_SYS_DOUBLEWRITE_BLOCK_SIZE   FSP_EXTENT_SIZE
 
#define TRX_SYS_FILE_FORMAT_TAG   (UNIV_PAGE_SIZE - 16)
 
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW   3645922177UL
 
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH   2745987765UL
 
#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N
 

Functions

UNIV_INTERN void trx_sys_create_doublewrite_buf (void)
 
UNIV_INTERN void trx_sys_doublewrite_init_or_restore_pages (ibool restore_corrupt_pages)
 
UNIV_INTERN void trx_sys_mark_upgraded_to_multiple_tablespaces (void)
 
UNIV_INTERN ibool trx_doublewrite_page_inside (ulint page_no)
 
UNIV_INLINE ibool trx_sys_hdr_page (ulint space, ulint page_no)
 
UNIV_INTERN void trx_sys_init_at_db_start (void)
 
UNIV_INTERN void trx_sys_create (void)
 
UNIV_INTERN ulint trx_sysf_rseg_find_free (mtr_t *mtr)
 
UNIV_INLINE trx_rseg_ttrx_sys_get_nth_rseg (trx_sys_t *sys, ulint n)
 
UNIV_INLINE void trx_sys_set_nth_rseg (trx_sys_t *sys, ulint n, trx_rseg_t *rseg)
 
UNIV_INLINE trx_sysf_ttrx_sysf_get (mtr_t *mtr)
 
UNIV_INLINE ulint trx_sysf_rseg_get_space (trx_sysf_t *sys_header, ulint i, mtr_t *mtr)
 
UNIV_INLINE ulint trx_sysf_rseg_get_page_no (trx_sysf_t *sys_header, ulint i, mtr_t *mtr)
 
UNIV_INLINE void trx_sysf_rseg_set_space (trx_sysf_t *sys_header, ulint i, ulint space, mtr_t *mtr)
 
UNIV_INLINE void trx_sysf_rseg_set_page_no (trx_sysf_t *sys_header, ulint i, ulint page_no, mtr_t *mtr)
 
UNIV_INLINE trx_id_t trx_sys_get_new_trx_id (void)
 
UNIV_INLINE trx_id_t trx_sys_get_new_trx_no (void)
 
UNIV_INLINE void trx_write_trx_id (byte *ptr, trx_id_t id)
 
UNIV_INLINE trx_id_t trx_read_trx_id (const byte *ptr)
 
UNIV_INLINE trx_ttrx_get_on_id (trx_id_t trx_id)
 
UNIV_INLINE trx_id_t trx_list_get_min_trx_id (void)
 
UNIV_INLINE ibool trx_is_active (trx_id_t trx_id)
 
UNIV_INTERN ibool trx_in_trx_list (trx_t *in_trx)
 
UNIV_INTERN void trx_sys_flush_commit_id (uint64_t commit_id, ulint field, mtr_t *mtr)
 
UNIV_INTERN void trx_sys_read_commit_id (void)
 
UNIV_INTERN void trx_sys_print_mysql_master_log_pos (void)
 
UNIV_INTERN void trx_sys_file_format_init (void)
 
UNIV_INTERN void trx_sys_file_format_close (void)
 
UNIV_INTERN void trx_sys_file_format_tag_init (void)
 
UNIV_INTERN void trx_sys_close (void)
 
UNIV_INTERN const char * trx_sys_file_format_id_to_name (const ulint id)
 
UNIV_INTERN ibool trx_sys_file_format_max_set (ulint format_id, const char **name)
 
UNIV_INTERN const char * trx_sys_file_format_max_get (void)
 
UNIV_INTERN ulint trx_sys_file_format_max_check (ulint max_format_id)
 
UNIV_INTERN ibool trx_sys_file_format_max_upgrade (const char **name, ulint format_id)
 
UNIV_INTERN void trx_sys_create_rsegs (ulint n_rsegs)
 

Variables

drizzled::atomic< uint64_t > trx_sys_commit_id
 
trx_sys_ttrx_sys
 
trx_doublewrite_ttrx_doublewrite
 
ibool trx_doublewrite_must_reset_space_ids
 
ibool trx_doublewrite_buf_is_being_created
 
ibool trx_sys_multiple_tablespace_format
 

Detailed Description

Transaction system

Created 3/26/1996 Heikki Tuuri

Definition in file trx0sys.h.

Macro Definition Documentation

#define TRX_SYS_DOUBLEWRITE   (UNIV_PAGE_SIZE - 200)

Doublewrite buffer The offset of the doublewrite buffer header on the trx system header page

Definition at line 485 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf(), trx_sys_doublewrite_init_or_restore_pages(), and trx_sys_mark_upgraded_to_multiple_tablespaces().

#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

Definition at line 497 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf().

#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

Definition at line 504 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf().

#define TRX_SYS_DOUBLEWRITE_BLOCK_SIZE   FSP_EXTENT_SIZE

Size of the doublewrite block in pages

Definition at line 540 of file trx0sys.h.

Referenced by buf_read_page_low(), trx_doublewrite_page_inside(), trx_sys_create_doublewrite_buf(), and trx_sys_doublewrite_init_or_restore_pages().

#define TRX_SYS_DOUBLEWRITE_FSEG   0

fseg header of the fseg containing the doublewrite buffer

Definition at line 487 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf().

#define TRX_SYS_DOUBLEWRITE_MAGIC   FSEG_HEADER_SIZE
 4-byte magic number which

shows if we already have created the doublewrite buffer

Definition at line 492 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf(), and trx_sys_doublewrite_init_or_restore_pages().

#define TRX_SYS_DOUBLEWRITE_MAGIC_N   536853855

Contents of TRX_SYS_DOUBLEWRITE_MAGIC

Definition at line 535 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf(), and trx_sys_doublewrite_init_or_restore_pages().

#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

Definition at line 510 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf().

#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED   (24 + FSEG_HEADER_SIZE)
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_NO.

Definition at line 531 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf(), trx_sys_doublewrite_init_or_restore_pages(), and trx_sys_mark_upgraded_to_multiple_tablespaces().

#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N   1783657386

Contents of TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED

Definition at line 537 of file trx0sys.h.

Referenced by trx_sys_create_doublewrite_buf(), trx_sys_doublewrite_init_or_restore_pages(), and trx_sys_mark_upgraded_to_multiple_tablespaces().

#define TRX_SYS_DRIZZLE_LOG_INFO   (UNIV_PAGE_SIZE - 1000)

The offset of the MySQL binlog offset info in the trx system header

Definition at line 476 of file trx0sys.h.

Referenced by trx_commit_off_kernel(), and trx_sys_read_commit_id().

#define TRX_SYS_DRIZZLE_LOG_NAME   12

Unused

Definition at line 480 of file trx0sys.h.

#define TRX_SYS_DRIZZLE_MAX_COMMIT_ID   8

the maximum commit id assigned in the system

Definition at line 477 of file trx0sys.h.

Referenced by trx_sys_flush_commit_id(), and trx_sys_read_commit_id().

#define TRX_SYS_FILE_FORMAT_TAG   (UNIV_PAGE_SIZE - 16)

File format tag The offset of the file format tag on the trx system header page (TRX_SYS_PAGE_NO of TRX_SYS_SPACE)

Definition at line 548 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N
Value:
Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format

identifier is added to this 64-bit constant.

Definition at line 557 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH   2745987765UL

Contents of TRX_SYS_FILE_FORMAT_TAG+4 when valid

Definition at line 554 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW   3645922177UL
Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format

identifier is added to this constant.

Definition at line 552 of file trx0sys.h.

#define TRX_SYS_FSEG_HEADER   8

segment header for the tablespace segment the trx system is created into

Definition at line 442 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_MAGIC_N   873422344

Contents of TRX_SYS_MYSQL_LOG_MAGIC_N_FLD

Definition at line 469 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_NAME_LEN   512
Maximum length of MySQL binlog file name, in bytes.
See Also
trx_sys_mysql_master_log_name
trx_sys_mysql_bin_log_name

Definition at line 467 of file trx0sys.h.

#define TRX_SYS_MYSQL_MASTER_LOG_INFO   (UNIV_PAGE_SIZE - 2000)
The offset of the MySQL replication info in the trx system header;

this contains the same fields as TRX_SYS_MYSQL_LOG_INFO below

Definition at line 473 of file trx0sys.h.

#define TRX_SYS_RSEGS   (8 + FSEG_HEADER_SIZE)
 the start of the array of

rollback segment specification slots

Definition at line 447 of file trx0sys.h.

#define TRX_SYS_TRX_ID_STORE   0

Transaction system header 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

Definition at line 419 of file trx0sys.h.

Referenced by trx_sys_init_at_db_start().

#define TRX_SYS_TRX_ID_WRITE_MARGIN   256
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

Definition at line 617 of file trx0sys.h.

Referenced by trx_sys_init_at_db_start().

Function Documentation

UNIV_INTERN ibool trx_doublewrite_page_inside ( ulint  page_no)

Determines if a page number is located inside the doublewrite buffer.

Returns
TRUE if the location is inside the two blocks of the doublewrite buffer in: page number

Determines if a page number is located inside the doublewrite buffer.

Returns
TRUE if the location is inside the two blocks of the doublewrite buffer
Parameters
page_noin: page number

Definition at line 153 of file trx0sys.cc.

References trx_doublewrite_struct::block1, trx_doublewrite_struct::block2, trx_doublewrite, trx_doublewrite_page_inside(), and TRX_SYS_DOUBLEWRITE_BLOCK_SIZE.

Referenced by buf_page_io_complete(), and trx_doublewrite_page_inside().

UNIV_INLINE trx_t* trx_get_on_id ( trx_id_t  trx_id)

Looks for the trx handle with the given id in trx_list.

Returns
the trx handle or NULL if not found in: trx id to search for

Referenced by row_vers_build_for_semi_consistent_read(), row_vers_impl_x_locked_off_kernel(), and trx_lists_init_at_db_start().

UNIV_INTERN ibool trx_in_trx_list ( trx_t in_trx)

Checks that trx is in the trx list.

Returns
TRUE if is in in: trx

Checks that trx is in the trx list.

Returns
TRUE if is in
Parameters
in_trxin: trx

Definition at line 638 of file trx0sys.cc.

References trx_in_trx_list(), trx_sys, ut_ad, UT_LIST_GET_FIRST, and UT_LIST_GET_NEXT.

Referenced by trx_in_trx_list().

UNIV_INLINE ibool trx_is_active ( trx_id_t  trx_id)

Checks if a transaction with the given id is active.

Returns
TRUE if active in: trx id of the transaction

Referenced by row_vers_impl_x_locked_off_kernel().

UNIV_INLINE trx_id_t trx_list_get_min_trx_id ( void  )

Returns the minumum trx id in trx list. This is the smallest id for which the trx can possibly be active. (But, you must look at the trx->conc_state to find out if the minimum trx id transaction itself is active, or already committed.)

Returns
the minimum trx id, or trx_sys->max_trx_id if the trx list is empty

Referenced by lock_sec_rec_read_check_and_lock().

UNIV_INLINE trx_id_t trx_read_trx_id ( const byte *  ptr)

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_...

Returns
id in: pointer to memory from where to read

Referenced by row_unlock_for_mysql().

UNIV_INTERN void trx_sys_create ( void  )

Creates and initializes the transaction system at the database creation.

Definition at line 908 of file trx0sys.cc.

References mtr_commit(), mtr_start(), trx_sys_create(), and trx_sys_init_at_db_start().

Referenced by innobase_start_or_create_for_mysql(), and trx_sys_create().

UNIV_INTERN void trx_sys_create_rsegs ( ulint  n_rsegs)

number of rollback segments to create

Parameters
n_rsegsnumber of rollback segments to create

Definition at line 1182 of file trx0sys.cc.

References recv_needed_recovery, and trx_sys_create_rsegs().

Referenced by innobase_start_or_create_for_mysql(), and trx_sys_create_rsegs().

UNIV_INTERN void trx_sys_doublewrite_init_or_restore_pages ( ibool  restore_corrupt_pages)

At a database startup initializes the doublewrite buffer memory structure if we already have a doublewrite buffer created in the data files. If we are upgrading to an InnoDB version which supports multiple tablespaces, then this function performs the necessary update operations. If we are in a crash recovery, this function uses a possible doublewrite buffer to restore half-written pages in the data files. in: TRUE=restore pages

At a database startup initializes the doublewrite buffer memory structure if we already have a doublewrite buffer created in the data files. If we are upgrading to an InnoDB version which supports multiple tablespaces, then this function performs the necessary update operations. If we are in a crash recovery, this function uses a possible doublewrite buffer to restore half-written pages in the data files.

Parameters
restore_corrupt_pagesin: TRUE=restore pages

Definition at line 430 of file trx0sys.cc.

References trx_doublewrite_struct::block1, trx_doublewrite_struct::block2, FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID, FIL_PAGE_OFFSET, FIL_TABLESPACE, mach_read_from_4(), mach_write_to_4(), OS_FILE_READ, trx_doublewrite, trx_doublewrite_must_reset_space_ids, TRX_SYS_DOUBLEWRITE, TRX_SYS_DOUBLEWRITE_BLOCK_SIZE, trx_sys_doublewrite_init_or_restore_pages(), TRX_SYS_DOUBLEWRITE_MAGIC, TRX_SYS_DOUBLEWRITE_MAGIC_N, TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED, TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N, trx_sys_multiple_tablespace_format, ut_align(), ut_free(), ut_malloc(), and trx_doublewrite_struct::write_buf.

Referenced by recv_recovery_from_checkpoint_start_func(), and trx_sys_doublewrite_init_or_restore_pages().

UNIV_INTERN void trx_sys_file_format_close ( void  )

Closes the tablespace tag system.

Definition at line 1172 of file trx0sys.cc.

References trx_sys_file_format_close().

Referenced by innobase_shutdown_for_mysql(), and trx_sys_file_format_close().

UNIV_INTERN const char* trx_sys_file_format_id_to_name ( const ulint  id)

Get the name representation of the file format from its id.

Returns
pointer to the name in: id of the file format

Get the name representation of the file format from its id.

Returns
pointer to the name
Parameters
idin: id of the file format

Definition at line 1001 of file trx0sys.cc.

References trx_sys_file_format_id_to_name(), and ut_a.

Referenced by innobase_file_format_name_lookup(), innobase_init(), innodb_file_format_max_validate(), innodb_file_format_name_validate(), trx_sys_file_format_id_to_name(), trx_sys_file_format_init(), and trx_sys_file_format_max_check().

UNIV_INTERN void trx_sys_file_format_init ( void  )
UNIV_INTERN ulint trx_sys_file_format_max_check ( ulint  max_format_id)

Check for the max file format tag stored on disk.

Returns
DB_SUCCESS or error code in: the max format id to check

Check for the max file format tag stored on disk. Note: If max_format_id is == DICT_TF_FORMAT_MAX + 1 then we only print a warning.

Returns
DB_SUCCESS or error code
Parameters
max_format_idin: max format id to check

Definition at line 1016 of file trx0sys.cc.

References DICT_TF_FORMAT_MAX, DICT_TF_FORMAT_MIN, file_format_struct::id, file_format_struct::name, trx_sys_file_format_id_to_name(), trx_sys_file_format_max_check(), and ut_a.

Referenced by innobase_start_or_create_for_mysql(), and trx_sys_file_format_max_check().

UNIV_INTERN const char* trx_sys_file_format_max_get ( void  )

Get the name representation of the file format from its id.

Returns
pointer to the max format name

Definition at line 1144 of file trx0sys.cc.

References file_format_struct::name, and trx_sys_file_format_max_get().

Referenced by innobase_init(), and trx_sys_file_format_max_get().

UNIV_INTERN ibool trx_sys_file_format_max_set ( ulint  format_id,
const char **  name 
)

Set the file format id unconditionally except if it's already the same value.

Returns
TRUE if value updated out: max file format name or NULL if not needed.

Set the file format id unconditionally except if it's already the same value.

Returns
TRUE if value updated
Parameters
format_idin: file format id
nameout: max file format name or NULL if not needed.

Definition at line 1067 of file trx0sys.cc.

References DICT_TF_FORMAT_MAX, file_format_struct::id, file_format_struct::mutex, trx_sys_file_format_max_set(), and ut_a.

Referenced by innodb_file_format_max_validate(), trx_sys_file_format_max_set(), and trx_sys_file_format_tag_init().

UNIV_INTERN ibool trx_sys_file_format_max_upgrade ( const char **  name,
ulint  format_id 
)

Update the file format tag in the system tablespace only if the given format id is greater than the known max id.

Returns
TRUE if format_id was bigger than the known max id in: file format identifier

Update the file format tag in the system tablespace only if the given format id is greater than the known max id.

Returns
TRUE if format_id was bigger than the known max id
Parameters
nameout: max file format name
format_idin: file format identifier

Definition at line 1116 of file trx0sys.cc.

References DICT_TF_FORMAT_MAX, file_format_struct::id, file_format_struct::mutex, file_format_struct::name, trx_sys_file_format_max_upgrade(), and ut_a.

Referenced by InnobaseEngine::doCreateTable(), ha_innobase::doOpen(), and trx_sys_file_format_max_upgrade().

UNIV_INTERN void trx_sys_file_format_tag_init ( 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.

Definition at line 1097 of file trx0sys.cc.

References DICT_TF_FORMAT_MIN, trx_sys_file_format_max_set(), and trx_sys_file_format_tag_init().

Referenced by innobase_start_or_create_for_mysql(), and trx_sys_file_format_tag_init().

UNIV_INTERN void trx_sys_flush_commit_id ( uint64_t  commit_id,
ulint  field,
mtr_t mtr 
)

Writes to the sys header file the latest commit_id in the system

Definition at line 684 of file trx0sys.cc.

References mlog_write_ull(), TRX_SYS_DRIZZLE_MAX_COMMIT_ID, trx_sys_flush_commit_id(), and trx_sysf_get().

Referenced by trx_commit_off_kernel(), and trx_sys_flush_commit_id().

UNIV_INLINE trx_id_t trx_sys_get_new_trx_id ( void  )

Allocates a new transaction id.

Returns
new, allocated trx id

Referenced by trx_start_low().

UNIV_INLINE trx_id_t trx_sys_get_new_trx_no ( void  )

Allocates a new transaction number.

Returns
new, allocated trx number

Referenced by trx_commit_off_kernel().

UNIV_INLINE trx_rseg_t* trx_sys_get_nth_rseg ( trx_sys_t sys,
ulint  n 
)

Gets the pointer in the nth slot of the rseg array.

Returns
pointer to rseg object, NULL if slot not in use in: index of slot
Parameters
sysin: trx system

Referenced by trx_start_low().

UNIV_INLINE ibool trx_sys_hdr_page ( ulint  space,
ulint  page_no 
)

Checks if a page address is the trx sys header page.

Returns
TRUE if trx sys header page in: page number
Parameters
spacein: space

Referenced by buf_read_ahead_linear(), buf_read_page_low(), and ibuf_merge_or_delete_for_page().

UNIV_INTERN void trx_sys_mark_upgraded_to_multiple_tablespaces ( void  )
UNIV_INTERN void trx_sys_print_mysql_master_log_pos ( void  )

Prints to stderr the MySQL master log offset info in the trx system header if the magic number shows it valid.

UNIV_INTERN void trx_sys_read_commit_id ( void  )

Reads the latest commit_id into trx_sys_commit_id

Definition at line 697 of file trx0sys.cc.

References mach_read_from_8(), mtr_commit(), mtr_start(), trx_sys_commit_id, TRX_SYS_DRIZZLE_LOG_INFO, TRX_SYS_DRIZZLE_MAX_COMMIT_ID, trx_sys_read_commit_id(), and trx_sysf_get().

Referenced by trx_sys_read_commit_id().

UNIV_INLINE void trx_sys_set_nth_rseg ( trx_sys_t sys,
ulint  n,
trx_rseg_t rseg 
)

Sets the pointer in the nth slot of the rseg array. in: pointer to rseg object, NULL if slot not in use

Parameters
sysin: trx system
nin: index of slot

Referenced by trx_rseg_mem_free().

UNIV_INLINE trx_sysf_t* trx_sysf_get ( mtr_t mtr)

Gets a pointer to the transaction system file copy and x-locks its page.

Returns
pointer to system file copy, page x-locked in: mtr

Referenced by trx_rseg_header_create(), trx_sys_flush_commit_id(), trx_sys_init_at_db_start(), trx_sys_read_commit_id(), and trx_sysf_rseg_find_free().

UNIV_INTERN ulint trx_sysf_rseg_find_free ( mtr_t mtr)

Looks for a free slot for a rollback segment in the trx system file copy.

Returns
slot index or ULINT_UNDEFINED if not found in: mtr

Looks for a free slot for a rollback segment in the trx system file copy.

Returns
slot index or ULINT_UNDEFINED if not found
Parameters
mtrin: mtr

Definition at line 718 of file trx0sys.cc.

References FIL_NULL, trx_sysf_get(), trx_sysf_rseg_find_free(), trx_sysf_rseg_get_page_no(), and ut_ad.

Referenced by trx_sysf_rseg_find_free().

UNIV_INLINE ulint trx_sysf_rseg_get_page_no ( trx_sysf_t sys_header,
ulint  i,
mtr_t mtr 
)

Gets the page number of the nth rollback segment slot in the trx system file copy.

Returns
page number, FIL_NULL if slot unused in: mtr
Parameters
sys_headerin: trx sys file copy
iin: slot index == rseg id

Referenced by trx_sysf_rseg_find_free().

UNIV_INLINE ulint trx_sysf_rseg_get_space ( trx_sysf_t sys_header,
ulint  i,
mtr_t mtr 
)

Gets the space of the nth rollback segment slot in the trx system file copy.

Returns
space id in: mtr
Parameters
sys_headerin: trx sys file copy
iin: slot index == rseg id
UNIV_INLINE void trx_sysf_rseg_set_page_no ( trx_sysf_t sys_header,
ulint  i,
ulint  page_no,
mtr_t mtr 
)

Sets the page number of the nth rollback segment slot in the trx system file copy. in: mtr

Parameters
sys_headerin: trx sys file copy
iin: slot index == rseg id
page_noin: page number, FIL_NULL if the slot is reset to unused

Referenced by trx_rseg_header_create().

UNIV_INLINE void trx_sysf_rseg_set_space ( trx_sysf_t sys_header,
ulint  i,
ulint  space,
mtr_t mtr 
)

Sets the space id of the nth rollback segment slot in the trx system file copy. in: mtr

Parameters
sys_headerin: trx sys file copy
iin: slot index == rseg id
spacein: space id

Referenced by trx_rseg_header_create().

UNIV_INLINE void trx_write_trx_id ( byte *  ptr,
trx_id_t  id 
)

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_... in: id

Parameters
ptrin: pointer to memory where written

Referenced by row_ins_step(), row_upd_index_entry_sys_field(), row_upd_rec_sys_fields_in_recovery(), and trx_undo_update_rec_get_update().

Variable Documentation

ibool trx_doublewrite_buf_is_being_created

Set to TRUE when the doublewrite buffer is being created

Definition at line 69 of file trx0sys.cc.

Referenced by trx_sys_create_doublewrite_buf().

ibool trx_doublewrite_must_reset_space_ids
The following is set to TRUE when we are upgrading from pre-4.1

format data files to the multiple tablespaces format data files

Definition at line 67 of file trx0sys.cc.

Referenced by ibuf_merge_or_delete_for_page(), innobase_start_or_create_for_mysql(), and trx_sys_doublewrite_init_or_restore_pages().

drizzled::atomic<uint64_t> trx_sys_commit_id

the highest commit identifier assigned in the system

Definition at line 96 of file trx0sys.cc.

Referenced by trx_commit_off_kernel(), and trx_sys_read_commit_id().

ibool trx_sys_multiple_tablespace_format
The following is TRUE when we are using the database in the

post-4.1 format, i.e., we have successfully upgraded, or have created a new database installation

Definition at line 74 of file trx0sys.cc.

Referenced by ibuf_insert(), ibuf_merge_or_delete_for_page(), trx_sys_create_doublewrite_buf(), trx_sys_doublewrite_init_or_restore_pages(), and trx_sys_mark_upgraded_to_multiple_tablespaces().