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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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5
sql/sql_class.cc
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@ -501,9 +501,6 @@ THD::THD()
net.vio=0;
#endif
client_capabilities= 0; // minimalistic client
#ifdef HAVE_QUERY_CACHE
query_cache_init_query(&net); // If error on boot
#endif
ull=0;
system_thread= NON_SYSTEM_THREAD;
cleanup_done= abort_on_warning= no_warnings_for_error= 0;
@ -796,7 +793,7 @@ THD::raise_condition_no_handler(uint sql_errno,
MYSQL_ERROR *cond= NULL;
DBUG_ENTER("THD::raise_condition_no_handler");
query_cache_abort(& net);
query_cache_abort(&query_cache_tls);
/* FIXME: broken special case */
if (no_warnings_for_error && (level == MYSQL_ERROR::WARN_LEVEL_ERROR))