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Introduce thd->query_cache_tls (thread

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local storage for query cache). 
We need more than one pointer in a thread to
represent the query cache and net->query_cache_query can not be used
any more (due to ABI compatibility issues and to different life
time of NET and THD).
This is a backport of the following patch from 6.0:
----------------------------------------------------------
revno: 2476.1157.2
committer: kostja@bodhi.(none)
timestamp: Sat 2007-06-16 13:29:24 +0400
This commit is contained in:
Konstantin Osipov
2009-10-13 22:18:48 +04:00
parent 10390cec03
commit ea6a22bfa8
10 changed files with 141 additions and 102 deletions
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24
sql/sql_class.h
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@ -315,6 +315,27 @@ typedef enum enum_diag_condition_item_name
*/
extern const LEX_STRING Diag_condition_item_names[];
/**
Query_cache_tls -- query cache thread local data.
*/
class Query_cache_block;
struct Query_cache_tls
{
/*
'first_query_block' should be accessed only via query cache
functions and methods to maintain proper locking.
*/
Query_cache_block *first_query_block;
void set_first_query_block(Query_cache_block *first_query_block_arg)
{
first_query_block= first_query_block_arg;
}
Query_cache_tls() :first_query_block(NULL) {}
};
#include "sql_lex.h" /* Must be here */
class Delayed_insert;
@ -1239,6 +1260,9 @@ public:
fields then.
*/
struct st_mysql_stmt *current_stmt;
#endif
#ifdef HAVE_QUERY_CACHE
Query_cache_tls query_cache_tls;
#endif
NET net; // client connection descriptor
Protocol *protocol; // Current protocol