#
# wl#9383 INNODB: ADD AN OPTION TO TURN OFF/ON DEADLOCK CHECKER
#

--source include/have_innodb.inc
--source include/count_sessions.inc

let $have_deadlock=`select @@GLOBAL.innodb_deadlock_detect`;

connection default;

CREATE TABLE t1(
	id	INT,
	PRIMARY KEY(id)
) ENGINE=InnoDB;

CREATE TABLE dl(
    id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT, 
    cnt INT UNSIGNED
) ENGINE=InnoDB;

INSERT INTO t1 VALUES(1), (2), (3);
# Preserve the initial value of the deadlock counter
INSERT INTO dl(cnt) SELECT variable_value FROM information_schema.global_status WHERE variable_name LIKE 'Innodb_deadlocks';

# We are not interested query results, only errors
--disable_result_log
BEGIN;

SELECT * FROM t1 WHERE id = 1 LOCK IN SHARE MODE;

connect (con1,localhost,root,,);
BEGIN;
SELECT * FROM t1 WHERE id = 2 LOCK IN SHARE MODE;

connect (con2,localhost,root,,);
BEGIN;
SELECT * FROM t1 WHERE id = 2 LOCK IN SHARE MODE;

send SELECT * FROM t1 WHERE id = 1 FOR UPDATE;

connection default;
send SELECT * FROM t1 WHERE id = 2 FOR UPDATE;

connection con2;
if (!$have_deadlock) {
--error ER_LOCK_WAIT_TIMEOUT
reap;
disconnect con1;
}
if ($have_deadlock) {
connection con1;
COMMIT;
disconnect con1;
connection con2;
--error 0,ER_LOCK_DEADLOCK,ER_LOCK_WAIT_TIMEOUT
reap;
}
ROLLBACK;
disconnect con2;

#
# Note here that con1 is the older transaction as it
# query started wait first. Thus, con1 gets lock
# wait timeout first. There is possibility that
# default connection gets lock timeout also or
# as con1 is rolled back it gets the locks it waited
# and does the update.
#
connection default;
--let $valid_deadlock_cnt= 1
if (!$have_deadlock) {
--error 0,ER_LOCK_WAIT_TIMEOUT
reap;
}
if ($have_deadlock) {
--error 0,ER_LOCK_DEADLOCK
reap;
--disable_query_log
INSERT INTO dl(cnt) SELECT variable_value FROM information_schema.global_status WHERE variable_name LIKE 'Innodb_deadlocks';
set @init_deadlock_cnt = (SELECT min(k.cnt) FROM dl k);
--let $valid_deadlock_cnt= `SELECT (max(t.cnt-@init_deadlock_cnt) = 1) FROM dl t`
--enable_query_log
}
# Indicates that the deadlock counter works well.
# Use the default =1 where is no deadlock detection,
# to enable unconditional check.
--echo 'Deadlock counter is valid';
--echo $valid_deadlock_cnt

ROLLBACK;

--enable_result_log
DROP TABLE t1;
DROP TABLE dl;
--source include/wait_until_count_sessions.inc