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Bug#11766349 - 59443: query_cache_debug.test is occasionally very slow

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The test case problem stemmed from the fact that a debug sync
signal is a global variable that persists until overwritten
by a new signal. This means that if two different signals
are raised in sequence, a thread waiting for the first signal
might miss it if the second signal sets the global variable
before the thread wakes up.

The solution is to deliver a subsequent signal only after the
waiting thread has received it.

mysql-test/t/query_cache_debug.test:
  Wait for signal to be delivered.
This commit is contained in:
Davi Arnaut 2011-05-30 12:17:22 -03:00
parent ec0b030f26
commit c7d2ec7dd5
2 changed files with 12 additions and 0 deletions
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2
mysql-test/r/query_cache_debug.result
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@ -153,7 +153,9 @@ SET DEBUG_SYNC="now WAIT_FOR parked1_2";
** until a broadcast signal reaches them causing both threads to
** come alive and check the condition.
SET DEBUG_SYNC="now SIGNAL go2";
** Wait for thd2 to receive the signal
SET DEBUG_SYNC="now SIGNAL go3";
** Wait for thd3 to receive the signal
**
** Finally signal the DELETE statement on THD1 one last time.
** The stmt will complete the query cache invalidation and return

10
mysql-test/t/query_cache_debug.test
View File

@ -208,7 +208,17 @@ SET DEBUG_SYNC="now WAIT_FOR parked1_2";
--echo ** until a broadcast signal reaches them causing both threads to
--echo ** come alive and check the condition.
SET DEBUG_SYNC="now SIGNAL go2";
--echo ** Wait for thd2 to receive the signal
let $wait_condition=
SELECT COUNT(*) = 1 FROM information_schema.processlist
WHERE state = "Waiting for query cache lock";
--source include/wait_condition.inc
SET DEBUG_SYNC="now SIGNAL go3";
--echo ** Wait for thd3 to receive the signal
let $wait_condition=
SELECT COUNT(*) = 2 FROM information_schema.processlist
WHERE state = "Waiting for query cache lock";
--source include/wait_condition.inc
--echo **
--echo ** Finally signal the DELETE statement on THD1 one last time.