diff options
Diffstat (limited to 'innobase/include/read0read.h')
| -rw-r--r-- | innobase/include/read0read.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/innobase/include/read0read.h b/innobase/include/read0read.h index db6bf888095..7a91248cf7f 100644 --- a/innobase/include/read0read.h +++ b/innobase/include/read0read.h @@ -68,7 +68,34 @@ void 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 mysql and restore global read view +back to a transaction read view. */ + +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. Otherwise, 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 +127,20 @@ 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*/ + ulint n_mysql_tables_in_use; + /* number of Innobase tables used in the + processing of this cursor */ +}; + #ifndef UNIV_NONINL #include "read0read.ic" #endif |