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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


include/mysql.h.pp:
  Update the ABI (NET::query_cache_query is now unused).
include/mysql_com.h:
  NET::query_cache_query is now unused.
sql/mysql_priv.h:
  Update signatures of ex-functios now member functions.
sql/sql_cache.cc:
  Introduce THD::query_cache_tls.
sql/sql_cache.h:
  Introduce THD::query_cache_tls.
sql/sql_class.cc:
  Introduce THD::query_cache_tls.
sql/sql_class.h:
  Introduce THD::query_cache_tls.
sql/sql_parse.cc:
  Use THD::query_cache_tls.
sql/sql_select.cc:
  Use THD::query_cache_tls.
This commit is contained in:
Konstantin Osipov
2009-10-13 22:18:48 +04:00
parent 9a65687bd9
commit 99420dd913
10 changed files with 141 additions and 102 deletions
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5
include/mysql_com.h
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@@ -264,10 +264,9 @@ typedef struct st_net {
*/
#endif
/*
'query_cache_query' should be accessed only via query cache
functions and methods to maintain proper locking.
Unused, please remove with the next incompatible ABI change.
*/
unsigned char *query_cache_query;
unsigned char *unused;
unsigned int last_errno;
unsigned char error;
my_bool unused4; /* Please remove with the next incompatible ABI change. */