MySQL 5.6.14 Source Code Document
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have_debug_sync.inc
1 --require r/have_debug_sync.require
2 disable_query_log;
3 let $value= query_get_value(SHOW VARIABLES LIKE 'debug_sync', Value, 1);
4 eval SELECT ('$value' LIKE 'ON %') AS debug_sync;
5 enable_query_log;