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c7395690c6
bug #46947 "Embedded SELECT without FOR UPDATE is causing a lock". Fixed comments in tests. Improved comments and performance of auxiliary scripts.
72 lines
1.8 KiB
PHP
72 lines
1.8 KiB
PHP
#
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# SUMMARY
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# Check if statement affecting or reading table '$table' doesn't
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# take any kind of locks on its rows.
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#
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# PARAMETERS
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# $table Table for which presence of row locks should be checked.
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# $con_aux Name of auxiliary connection to be used by this script.
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# $statement Statement to be checked.
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#
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# EXAMPLE
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# innodb_mysql_lock2.test
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#
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--disable_result_log
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--disable_query_log
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connection default;
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begin;
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--eval select * from $table for update;
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connection $con_aux;
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begin;
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--send_eval $statement;
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--enable_result_log
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--enable_query_log
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connection default;
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# Wait until statement is successfully executed while
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# all rows in table are X-locked. This means that it
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# does not acquire any row locks.
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# We use wait_condition.inc instead of simply reaping
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# statement here in order to avoid deadlocks if test
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# fails and to time out gracefully instead.
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let $wait_condition=
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select count(*) = 0 from information_schema.processlist
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where info = "$statement";
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--source include/wait_condition.inc
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--disable_result_log
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--disable_query_log
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if ($success)
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{
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# Apparently statement was successfully executed and thus it
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# has not required any row locks.
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# To be safe against wait_condition.inc succeeding due to
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# races let us first reap the statement being checked to
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# ensure that it has been successfully executed.
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connection $con_aux;
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--reap
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rollback;
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connection default;
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rollback;
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--echo Success: '$statement' doesn't take row locks on '$table'.
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}
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if (!$success)
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{
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# Waiting has timed out. Apparently statement was blocked on
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# some row lock. So to be able to continue we need to unlock
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# rows first.
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rollback;
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connection $con_aux;
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--reap
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rollback;
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connection default;
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--echo Error: '$statement' takes some row locks on '$table'!
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}
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--enable_result_log
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--enable_query_log
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