diff options
Diffstat (limited to 'sql/table.h')
| -rw-r--r-- | sql/table.h | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/sql/table.h b/sql/table.h index b6ea372b41e..1762ae8785d 100644 --- a/sql/table.h +++ b/sql/table.h @@ -1350,24 +1350,36 @@ struct TABLE_LIST bool prelocking_placeholder; /** Indicates that if TABLE_LIST object corresponds to the table/view - which requires special handling/meta-data locking. + which requires special handling. */ enum { - /* Normal open, shared metadata lock should be taken. */ - NORMAL_OPEN= 0, - /* - It's target table of CREATE TABLE ... SELECT so we should - either open table if it exists (and take shared metadata lock) - or take exclusive metadata lock if it doesn't exist. - */ - OPEN_OR_CREATE, + /* Normal open. */ + OPEN_NORMAL= 0, + /* Associate a table share only if the the table exists. */ + OPEN_IF_EXISTS, + /* Don't associate a table share. */ + OPEN_STUB + } open_strategy; + /** + Indicates the locking strategy for the object being opened: + whether the associated metadata lock is shared or exclusive. + */ + enum + { + /* Take a shared metadata lock before the object is opened. */ + SHARED_MDL= 0, /* - It's target view of CREATE/ALTER VIEW. We should take exclusive - metadata lock for this table list element. + Take a exclusive metadata lock before the object is opened. + If opening is successful, downgrade to a shared lock. */ - TAKE_EXCLUSIVE_MDL - } open_type; + EXCLUSIVE_DOWNGRADABLE_MDL, + /* Take a exclusive metadata lock before the object is opened. */ + EXCLUSIVE_MDL + } lock_strategy; + /* For transactional locking. */ + int lock_timeout; /* NOWAIT or WAIT [X] */ + bool lock_transactional; /* If transactional lock requested. */ bool internal_tmp_table; /** TRUE if an alias for this table was specified in the SQL. */ bool is_alias; |