mariadb/mysql-test/t/innodb-lock.test

-- source include/have_innodb.inc

#
# Check and select innodb lock type
#

set global innodb_table_locks=1;

select @@innodb_table_locks;

#
# Testing of explicit table locks with enforced table locks
#

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);

--disable_warnings
drop table if exists t1;
--enable_warnings

#
# Testing of explicit table locks with enforced table locks
#

set @@innodb_table_locks=1;

connection con1;
create table t1 (id integer, x integer) engine=INNODB;
insert into t1 values(0, 0);
set autocommit=0;
SELECT * from t1 where id = 0 FOR UPDATE;

connection con2;
set autocommit=0;

# The following statement should hang because con1 is locking the page
--send
lock table t1 write;
--sleep 2;

connection con1;
update t1 set x=1 where id = 0;
select * from t1;
commit;

connection con2;
reap;
update t1 set x=2 where id = 0;
commit;
unlock tables;

connection con1;
select * from t1;
commit;

drop table t1;

#
# Try with old lock method (where LOCK TABLE is ignored by InnoDB)
#

set @@innodb_table_locks=0;

create table t1 (id integer primary key, x integer) engine=INNODB;
insert into t1 values(0, 0),(1,1),(2,2);
commit;
SELECT * from t1 where id = 0 FOR UPDATE;

connection con2;
set autocommit=0;
set @@innodb_table_locks=0;

# The following statement should work becase innodb doesn't check table locks
lock table t1 write;

connection con1;

# This will be locked by MySQL
--send
update t1 set x=10 where id = 2;
--sleep 2

connection con2;

# Note that we will get a deadlock if we try to select any rows marked
# for update by con1 !

SELECT * from t1 where id = 2;
UPDATE t1 set x=3 where id = 2;
commit;
SELECT * from t1;
commit;
unlock tables;

connection con1;
reap;
commit;
select * from t1;
drop table t1;