mariadb/mysql-test/t/flush_block_commit.test

# Let's see if FLUSH TABLES WITH READ LOCK blocks COMMIT of existing
# transactions.
# We verify that we did not introduce a deadlock.

-- source include/have_innodb.inc

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connect (con3,localhost,root,,);
connection con1;
drop table if exists t1;
create table t1 (a int) type=innodb;

# blocks COMMIT ?

begin;
insert into t1 values(1);
connection con2;
flush tables with read lock;
select * from t1;
connection con1;
send commit; # blocked by con2
sleep 1;
connection con2;
select * from t1; # verify con1 was blocked and data did not move
unlock tables;
connection con1;
reap;

# No deadlock ?

connection con1;
begin;
select * from t1 for update;
connection con2;
begin;
send select * from t1 for update; # blocked by con1
sleep 1;
connection con3;
send flush tables with read lock; # blocked by con2
connection con1;
commit; # should not be blocked by con3
connection con2;
reap;
connection con3;
reap;
unlock tables;
connection con1;
drop table t1;