97 lines
2.7 KiB
PHP
97 lines
2.7 KiB
PHP
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#
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# SUMMARY
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# Check if statement reading table '$table' allows concurrent
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# inserts in it.
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#
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# PARAMETERS
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# $table Table in which concurrent inserts should be allowed.
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# $con_aux1 Name of the first auxiliary connection to be used by this
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# script.
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# $con_aux2 Name of the second auxiliary connection to be used by this
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# script.
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# $statement Statement to be checked.
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# $restore_table Table which might be modified by statement to be checked
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# and thus needs backing up before its execution and
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# restoring after it (can be empty).
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#
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# EXAMPLE
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# lock_sync.test
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#
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--disable_result_log
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--disable_query_log
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# Reset DEBUG_SYNC facility for safety.
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set debug_sync= "RESET";
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if ($restore_table)
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{
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--eval create temporary table t_backup select * from $restore_table;
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}
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connection $con_aux1;
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set debug_sync='after_lock_tables_takes_lock SIGNAL parked WAIT_FOR go';
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--send_eval $statement;
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connection $con_aux2;
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set debug_sync='now WAIT_FOR parked';
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--send_eval insert into $table (i) values (0);
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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 concurrent insert is successfully executed while
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# statement being checked has its tables locked.
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# We use wait_condition.inc instead of simply reaping
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# concurrent insert 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 = "insert into $table (i) values (0)";
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--source include/wait_condition.inc
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--disable_result_log
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--disable_query_log
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if ($success)
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{
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# Apparently concurrent insert was successfully executed.
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# To be safe against wait_condition.inc succeeding due to
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# races let us first reap concurrent insert to ensure that
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# it has really been successfully executed.
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connection $con_aux2;
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--reap
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connection default;
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set debug_sync= 'now SIGNAL go';
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connection $con_aux1;
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--reap
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connection default;
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--echo Success: '$statement' allows concurrent inserts into '$table'.
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}
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if (!$success)
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{
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# Waiting has timed out. Apparently concurrent insert was blocked.
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# So to be able to continue we need to end our statement first.
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set debug_sync= 'now SIGNAL go';
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connection $con_aux1;
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--reap
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connection $con_aux2;
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--reap
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connection default;
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--echo Error: '$statement' doesn't allow concurrent inserts into '$table'!
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}
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--eval delete from $table where i = 0;
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if ($restore_table)
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{
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--eval truncate table $restore_table;
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--eval insert into $restore_table select * from t_backup;
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drop temporary table t_backup;
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}
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# Clean-up. Reset DEBUG_SYNC facility after use.
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set debug_sync= "RESET";
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--enable_result_log
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--enable_query_log
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