diff options
Diffstat (limited to 'sql/table.h')
| -rw-r--r-- | sql/table.h | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/sql/table.h b/sql/table.h index fcff0cfb0d5..ea585208b83 100644 --- a/sql/table.h +++ b/sql/table.h @@ -1581,20 +1581,21 @@ struct TABLE_LIST OPEN_STUB } open_strategy; /** - Indicates the locking strategy for the object being opened: - whether the associated metadata lock is shared or exclusive. + Indicates the locking strategy for the object being opened. */ enum { - /* Take a shared metadata lock before the object is opened. */ - SHARED_MDL= 0, /* - Take a exclusive metadata lock before the object is opened. - If opening is successful, downgrade to a shared lock. + Take metadata lock specified by 'mdl_request' member before + the object is opened. Do nothing after that. */ - EXCLUSIVE_DOWNGRADABLE_MDL, - /* Take a exclusive metadata lock before the object is opened. */ - EXCLUSIVE_MDL + OTLS_NONE= 0, + /* + Take (exclusive) metadata lock specified by 'mdl_request' member + before object is opened. If opening is successful, downgrade to + a shared lock. + */ + OTLS_DOWNGRADE_IF_EXISTS } lock_strategy; /* For transactional locking. */ int lock_timeout; /* NOWAIT or WAIT [X] */ |