DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (a INT);
INSERT INTO t2 VALUES(10);
INSERT INTO t2 VALUES(10);
INSERT INTO t2 VALUES(20);
INSERT INTO t2 VALUES(10);
INSERT INTO t2 VALUES(20);
SET DEBUG_SYNC= 'locked_table_name SIGNAL thread1_ready WAIT_FOR threads_dumped';
CREATE TABLE t1 (a INT);
SET DEBUG_SYNC= 'now WAIT_FOR thread1_ready';
SET DEBUG_SYNC= 'execute_command_after_close_tables SIGNAL thread2_ready WAIT_FOR threads_dumped';
SELECT a FROM t2 WHERE a > 15;
SET DEBUG_SYNC= 'now WAIT_FOR thread2_ready';
SHOW PROCESSLIST;
Id	User	Host	db	Command	Time	State	Info	Rows_sent	Rows_examined	Rows_read
###	root	###	test	Query	###	###	SHOW PROCESSLIST	0	0	2
###	root	###	test	Query	###	###	CREATE TABLE t1 (a INT)	0	0	1
###	root	###	test	Query	###	###	SELECT a FROM t2 WHERE a > 15	2	5	6
SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id;
id	info	rows_sent	rows_examined	rows_read
###	SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id	0	0	1
###	CREATE TABLE t1 (a INT)	0	0	1
###	SELECT a FROM t2 WHERE a > 15	2	5	6
SET DEBUG_SYNC= 'now SIGNAL threads_dumped';
a
20
20
SET DEBUG_SYNC= 'sent_row SIGNAL thread1_ready WAIT_FOR threads_dumped';
SELECT a FROM t2 WHERE a < 15;
SET DEBUG_SYNC= 'now WAIT_FOR thread1_ready';
SET DEBUG_SYNC= 'sent_row SIGNAL thread2_ready WAIT_FOR threads_dumped';
SELECT a FROM t2 WHERE a > 15;
SET DEBUG_SYNC= 'now WAIT_FOR thread2_ready';
SHOW PROCESSLIST;
Id	User	Host	db	Command	Time	State	Info	Rows_sent	Rows_examined	Rows_read
###	root	###	test	Query	###	###	SHOW PROCESSLIST	0	0	4
###	root	###	test	Query	###	###	SELECT a FROM t2 WHERE a < 15	1	0	1
###	root	###	test	Query	###	###	SELECT a FROM t2 WHERE a > 15	1	0	3
SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id;
id	info	rows_sent	rows_examined	rows_read
###	SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id	0	0	1
###	SELECT a FROM t2 WHERE a < 15	1	0	1
###	SELECT a FROM t2 WHERE a > 15	1	0	3
SET DEBUG_SYNC= 'now SIGNAL threads_dumped';
a
10
10
10
a
20
20
SET DEBUG_SYNC= 'execute_command_after_close_tables SIGNAL thread1_ready WAIT_FOR threads_dumped';
UPDATE t2 SET a = 15 WHERE a = 20;
SET DEBUG_SYNC= 'now WAIT_FOR thread1_ready';
SET DEBUG_SYNC= 'execute_command_after_close_tables SIGNAL thread2_ready WAIT_FOR threads_dumped';
UPDATE t2 SET a = 15 WHERE a = 10;
SET DEBUG_SYNC= 'now WAIT_FOR thread2_ready';
SHOW PROCESSLIST;
Id	User	Host	db	Command	Time	State	Info	Rows_sent	Rows_examined	Rows_read
###	root	###	test	Query	###	###	SHOW PROCESSLIST	0	0	4
###	root	###	test	Query	###	###	UPDATE t2 SET a = 15 WHERE a = 20	0	5	6
###	root	###	test	Query	###	###	UPDATE t2 SET a = 15 WHERE a = 10	0	5	6
SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id;
id	info	rows_sent	rows_examined	rows_read
###	SELECT id, info, rows_sent, rows_examined, rows_read FROM INFORMATION_SCHEMA.PROCESSLIST ORDER BY id	0	0	1
###	UPDATE t2 SET a = 15 WHERE a = 20	0	5	6
###	UPDATE t2 SET a = 15 WHERE a = 10	0	5	6
SET DEBUG_SYNC= 'now SIGNAL threads_dumped';
DROP TABLES t1, t2;