CHANGE MASTER TO master_host='127.0.0.1', master_user='root';
START SLAVE SQL_THREAD;
include/wait_for_slave_sql_to_start.inc
SET @@SESSION.debug_sync=
'hold_sss_with_run_lock SIGNAL sss_got_run_lock WAIT_FOR sss_continue';
SHOW SLAVE STATUS;
connect  stopper, 127.0.0.1, root, , , $SERVER_MYPORT_1;
SET @@SESSION.debug_sync= 'now WAIT_FOR sss_got_run_lock';
STOP SLAVE SQL_THREAD;
connect  continuer, 127.0.0.1, root, , , $SERVER_MYPORT_1;
SET @@SESSION.debug_sync= 'now SIGNAL sss_continue';
connection stopper;
disconnect continuer;
connection default;
disconnect stopper;
SET @@SESSION.debug_sync= RESET;
include/wait_for_slave_sql_to_stop.inc
RESET SLAVE ALL;