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Bug#56822: Add a thread state for sessions waiting on the query cache lock

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Only wait for a single debug signal at a time as the signal state
is global. Also, do not activate the query cache debug sync points
if the thread has no associated THD session.
This commit is contained in:
Davi Arnaut
2010-10-08 09:16:20 -03:00
parent 921fd52975
commit 657b157511
3 changed files with 39 additions and 13 deletions
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14
mysql-test/r/query_cache_debug.result
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@ -123,16 +123,20 @@ SET DEBUG_SYNC="now WAIT_FOR parked1_1";
** On THD2: Insert a result into the cache. This attempt will be blocked
** because of a debug hook placed just before the mutex lock after which
** the first part of the result set is written.
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2";
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2 EXECUTE 1";
SELECT SQL_CACHE * FROM t2 UNION SELECT * FROM t3;
=================================== Connection default
** Assert that the SELECT-stmt thread reaches the sync point.
SET DEBUG_SYNC="now WAIT_FOR parked2";
**
**
=================================== Connection thd3
** On THD3: Insert another result into the cache and block on the same
** debug hook.
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3";
SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5;;
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3 EXECUTE 1";
SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5;
=================================== Connection default
** Assert that the two SELECT-stmt threads to reach the hook.
SET DEBUG_SYNC="now WAIT_FOR parked2";
** Assert that the SELECT-stmt thread reaches the sync point.
SET DEBUG_SYNC="now WAIT_FOR parked3";
**
**