Kristofer Pettersson 41085809c3 Bug#39253 Large query cache still freezes server after fix for bug #21074 ...

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()

2009-11-20 13:49:06 +01:00

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