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Pre-requisite patch for bug #51263 "Deadlock between

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transactional SELECT and ALTER TABLE ... REBUILD PARTITION".

The goal of this patch is to decouple type of metadata
lock acquired for table by open_tables() from type of
table-level lock to be acquired on it.

To achieve this we change approach to how we determine what
type of metadata lock should be acquired on table to be open.
Now instead of inferring it at open_tables() time from flags
and type of table-level lock we rely on that type of metadata
lock is properly set at parsing time and is not changed
further.
This commit is contained in:
Dmitry Lenev
2010-05-25 16:35:01 +04:00
parent 6ceacd4fb9
commit a3c080be7a
20 changed files with 359 additions and 227 deletions
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19
sql/table.h
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@ -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] */