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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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10
sql/sql_lex.h
View File

@ -502,6 +502,7 @@ public:
LEX_STRING *alias,
ulong table_options,
thr_lock_type flags= TL_UNLOCK,
enum_mdl_type mdl_type= MDL_SHARED_READ,
List<Index_hint> *hints= 0,
LEX_STRING *option= 0);
virtual void set_lock_for_tables(thr_lock_type lock_type) {}
@ -799,6 +800,7 @@ public:
LEX_STRING *alias,
ulong table_options,
thr_lock_type flags= TL_UNLOCK,
enum_mdl_type mdl_type= MDL_SHARED_READ,
List<Index_hint> *hints= 0,
LEX_STRING *option= 0);
TABLE_LIST* get_table_list();
@ -2249,6 +2251,7 @@ public:
yacc_yyvs= NULL;
m_set_signal_info.clear();
m_lock_type= TL_READ_DEFAULT;
m_mdl_type= MDL_SHARED_READ;
}
~Yacc_state();
@ -2260,6 +2263,7 @@ public:
void reset_before_substatement()
{
m_lock_type= TL_READ_DEFAULT;
m_mdl_type= MDL_SHARED_READ;
}
/**
@ -2299,6 +2303,12 @@ public:
*/
thr_lock_type m_lock_type;
/**
The type of requested metadata lock for tables added to
the statement table list.
*/
enum_mdl_type m_mdl_type;
/*
TODO: move more attributes from the LEX structure here.
*/