read0read.cc File Reference

#include "read0read.h"
#include "srv0srv.h"
#include "trx0sys.h"

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Classes
struct	CreateView

Functions
UNIV_INLINE read_view_t *	read_view_create_low (ulint n, mem_heap_t *heap)
UNIV_INLINE read_view_t *	read_view_clone (const read_view_t *view, mem_heap_t *heap)
UNIV_INTERN read_view_t *	read_view_open_now (trx_id_t cr_trx_id, mem_heap_t *heap)
UNIV_INTERN read_view_t *	read_view_purge_open (mem_heap_t *heap)
UNIV_INTERN void	read_view_close_for_mysql (trx_t *trx)
UNIV_INTERN void	read_view_print (const read_view_t *view)
UNIV_INTERN cursor_view_t *	read_cursor_view_create_for_mysql (trx_t *cr_trx)
UNIV_INTERN void	read_cursor_view_close_for_mysql (trx_t *trx, cursor_view_t *curview)
UNIV_INTERN void	read_cursor_set_for_mysql (trx_t *trx, cursor_view_t *curview)

Detailed Description

Cursor read

Created 2/16/1997 Heikki Tuuri

Definition in file read0read.cc.

Function Documentation

UNIV_INTERN void read_cursor_set_for_mysql	(	trx_t *	trx,
		cursor_view_t *	curview
	)

This function sets a given consistent cursor view to a transaction read view if given consistent cursor view is not NULL. Otherwise, function restores a global read view to a transaction read view.

Parameters

trx	in: transaction where cursor is set
curview	in: consistent cursor view to be set

Definition at line 636 of file read0read.cc.

UNIV_INTERN void read_cursor_view_close_for_mysql	(	trx_t *	trx,
		cursor_view_t *	curview
	)

Close a given consistent cursor view for mysql and restore global read view back to a transaction read view.

Parameters

trx	in: trx
curview	in: cursor view to be closed

Definition at line 610 of file read0read.cc.

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UNIV_INTERN cursor_view_t* read_cursor_view_create_for_mysql

(

trx_t *

cr_trx

)

Create a high-granularity consistent cursor view for mysql to be used in cursors. In this consistent read view modifications done by the creating transaction after the cursor is created or future transactions are not visible.

Parameters

cr_trx

in: trx where cursor view is created

Definition at line 543 of file read0read.cc.

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UNIV_INLINE read_view_t* read_view_clone	(	const read_view_t *	view,
		mem_heap_t *	heap
	)

Clones a read view object. This function will allocate space for two read views contiguously, one identical in size and content as

Parameters

view	(starting at returned pointer) and another view immediately following the trx_ids array. The second view will have space for an extra trx_id_t element.

Returns

read view struct

Parameters

view	in: view to clone
heap	in: memory heap from which allocated

Definition at line 207 of file read0read.cc.

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UNIV_INTERN void read_view_close_for_mysql

(

trx_t *

trx

)

Closes a consistent read view for MySQL. This function is called at an SQL statement end if the trx isolation level is <= TRX_ISO_READ_COMMITTED.

Parameters

trx	in: trx which has a read view

Definition at line 484 of file read0read.cc.

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UNIV_INLINE read_view_t* read_view_create_low	(	ulint	n,
		mem_heap_t *	heap
	)

Creates a read view object.

Returns

own: read view struct

Parameters

n	in: number of cells in the trx_ids array
heap	in: memory heap from which allocated

Definition at line 182 of file read0read.cc.

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UNIV_INTERN read_view_t* read_view_open_now	(	trx_id_t	cr_trx_id,
		mem_heap_t *	heap
	)

Opens a read view where exactly the transactions serialized before this point in time are seen in the view.

Returns

own: read view struct

Parameters

cr_trx_id	in: trx_id of creating transaction, or 0 used in purge
heap	in: memory heap from which allocated

Definition at line 377 of file read0read.cc.

UNIV_INTERN void read_view_print

(

const read_view_t *

view

)

Prints a read view to stderr.

Parameters

view	in: read view

Definition at line 502 of file read0read.cc.

UNIV_INTERN read_view_t* read_view_purge_open

(

mem_heap_t *

heap

)

Makes a copy of the oldest existing read view, with the exception that also the creating trx of the oldest view is set as not visible in the 'copied' view. Opens a new view if no views currently exist. The view must be closed with ..._close. This is used in purge.

Returns

own: read view struct

Parameters

heap	in: memory heap from which allocated

Definition at line 403 of file read0read.cc.

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