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Bug#39253 Large query cache still freezes server after fix for bug #21074

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This patch introduce a limit on the time the query cache can
block with a lock on SELECTs.

Other operations which causes a change in the table
data will still be blocked.


sql/sql_cache.cc:
  * Introduced a timeout value for the qc lock when entering send_result_to_client()
  and store_query() methods.
sql/sql_cache.h:
  * New signature for Query_cache::try_lock()
This commit is contained in:
Kristofer Pettersson 2009-11-20 13:49:06 +01:00
commit 41085809c3
2 changed files with 36 additions and 5 deletions
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2
sql/sql_cache.h
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@ -485,7 +485,7 @@ protected:
const char *name);
my_bool in_blocks(Query_cache_block * point);
bool try_lock(void);
bool try_lock(bool use_timeout= FALSE);
void lock(void);
void lock_and_suspend(void);
void unlock(void);