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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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16
mysql-test/t/query_cache_debug.test
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@ -170,20 +170,26 @@ connection thd2;
--echo ** On THD2: Insert a result into the cache. This attempt will be blocked
--echo ** because of a debug hook placed just before the mutex lock after which
--echo ** 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";
--send SELECT SQL_CACHE * FROM t2 UNION SELECT * FROM t3
connection default;
--echo =================================== Connection default
--echo ** Assert that the SELECT-stmt thread reaches the sync point.
SET DEBUG_SYNC="now WAIT_FOR parked2";
--echo **
--echo **
connection thd3;
--echo =================================== Connection thd3
--echo ** On THD3: Insert another result into the cache and block on the same
--echo ** debug hook.
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3";
--send SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5;
SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3 EXECUTE 1";
--send SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5
connection default;
--echo =================================== Connection default
--echo ** Assert that the two SELECT-stmt threads to reach the hook.
SET DEBUG_SYNC="now WAIT_FOR parked2";
--echo ** Assert that the SELECT-stmt thread reaches the sync point.
SET DEBUG_SYNC="now WAIT_FOR parked3";
--echo **
--echo **