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----------------------------------------------------------
revno: 2617.69.20
committer: Konstantin Osipov <kostja@sun.com>
branch nick: 5.4-4284-1-assert
timestamp: Thu 2009-08-13 18:29:55 +0400
message:
  WL#4284 "Transactional DDL locking"
  A review fix.
  Since WL#4284 implementation separated MDL_request and MDL_ticket,
  MDL_request becamse a utility object necessary only to get a ticket.
  Store it by-value in TABLE_LIST with the intent to merge
  MDL_request::key with table_list->table_name and table_list->db
  in future.
  Change the MDL subsystem to not require MDL_requests to
  stay around till close_thread_tables().
  Remove the list of requests from the MDL context.
  Requests for shared metadata locks acquired in open_tables()
  are only used as a list in recover_from_failed_open_table_attempt(),
  which calls mdl_context.wait_for_locks() for this list.
  To keep such list for recover_from_failed_open_table_attempt(),
  introduce a context class (Open_table_context), that collects
  all requests.
  A lot of minor cleanups and simplications that became possible
  with this change.
This commit is contained in:
Konstantin Osipov
2009-12-08 12:57:07 +03:00
parent 4a8a1c568d
commit a66a2608ae
30 changed files with 566 additions and 733 deletions
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14
sql/table.cc
View File

@ -4583,6 +4583,14 @@ void TABLE_LIST::reinit_before_use(THD *thd)
}
while (parent_embedding &&
parent_embedding->nested_join->join_list.head() == embedded);
mdl_request.ticket= NULL;
/*
Not strictly necessary, but we manipulate with the type in open_table(),
so it's "safe" to reset the lock request type to the parser default, to
restore things back to first-execution state.
*/
mdl_request.set_type(MDL_SHARED);
}
/*
@ -4811,11 +4819,11 @@ size_t max_row_length(TABLE *table, const uchar *data)
objects for all elements of table list.
*/
void alloc_mdl_requests(TABLE_LIST *table_list, MEM_ROOT *root)
void init_mdl_requests(TABLE_LIST *table_list)
{
for ( ; table_list ; table_list= table_list->next_global)
table_list->mdl_request=
MDL_request::create(0, table_list->db, table_list->table_name, root);
table_list->mdl_request.init(0, table_list->db, table_list->table_name,
MDL_SHARED);
}