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Implement MySQL framework to support consistent read views in

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cursors for InnoDB. The idea of the patch is that if MySQL requests
a consistent read view, we open one when open a cursor, set is as the
active view to a transaction when fetch from the cursor, and close
together with cursor close. This patch is associated to bugs #11813, 
#11832, and #11833. Contains after review fixes.
This commit is contained in:
unknown 2005-07-22 14:10:03 +03:00
commit 6fd13aaa3c
8 changed files with 294 additions and 13 deletions
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40
innobase/include/read0read.h
View file

@ -69,6 +69,35 @@ read_view_print(
/*============*/
read_view_t* view); /* in: read view */
/*************************************************************************
Create a consistent cursor view for mysql to be used in cursors. In this
consistent read view modifications done by the creating transaction or future
transactions are not visible. */
cursor_view_t*
read_cursor_view_create_for_mysql(
/*==============================*/
trx_t* cr_trx);/* in: trx where cursor view is created */
/*************************************************************************
Close a given consistent cursor view for and restore global read view
back to a transaction. */
void
read_cursor_view_close_for_mysql(
/*=============================*/
trx_t* trx, /* in: trx */
cursor_view_t* curview); /* in: cursor view to be closed */
/*************************************************************************
This function sets a given consistent cursor view to a transaction
read view if given consistent cursor view is not null. Otherwice, function
restores a global read view to a transaction read view. */
void
read_cursor_set_for_mysql(
/*======================*/
trx_t* trx, /* in: transaction where cursor is set */
cursor_view_t* curview);/* in: consistent cursor view to be set */
/* Read view lists the trx ids of those transactions for which a consistent
read should not see the modifications to the database. */
@ -100,6 +129,17 @@ struct read_view_struct{
/* List of read views in trx_sys */
};
/* Implement InnoDB framework to support consistent read views in
cursors. This struct holds both heap where consistent read view
is allocated and pointer to a read view. */
struct cursor_view_struct{
mem_heap_t* heap;
/* Memory heap for the cursor view */
read_view_t* read_view;
/* Consistent read view of the cursor*/
};
#ifndef UNIV_NONINL
#include "read0read.ic"
#endif

1
innobase/include/read0types.h
View file

@ -10,5 +10,6 @@ Created 2/16/1997 Heikki Tuuri
#define read0types_h
typedef struct read_view_struct read_view_t;
typedef struct cursor_view_struct cursor_view_t;
#endif

15
innobase/include/trx0trx.h
View file

@ -602,8 +602,19 @@ struct trx_struct{
UT_LIST_BASE_NODE_T(lock_t)
trx_locks; /* locks reserved by the transaction */
/*------------------------------*/
mem_heap_t* read_view_heap; /* memory heap for the read view */
read_view_t* read_view; /* consistent read view or NULL */
mem_heap_t* global_read_view_heap;
/* memory heap for the global read
view */
read_view_t* global_read_view;
/* consistent read view used in the
transaction is stored here if
transaction is using a consistent
read view associated to a cursor */
read_view_t* read_view; /* consistent read view used in the
transaction or NULL, this read view
can be normal read view associated
to a transaction or read view
associated to a cursor */
/*------------------------------*/
UT_LIST_BASE_NODE_T(trx_named_savept_t)
trx_savepoints; /* savepoints set with SAVEPOINT ...,