mariadb/mysql-test/t/lock_multi.test

# This test doesn't work with the embedded version as this code
# assumes that one query is running while we are doing queries on
# a second connection.
# This would work if mysqltest run would be threaded and handle each
# connection in a separate thread.
#
-- source include/not_embedded.inc

drop table if exists t1,t2;

# test to see if select will get the lock ahead of low priority update

connect (locker,localhost,root,,);
connect (reader,localhost,root,,);
connect (writer,localhost,root,,);

connection locker;
create table t1(n int);
insert into t1 values (1);
lock tables t1 write;
connection writer;
send update low_priority t1 set n = 4;
connection reader;
--sleep 2
send select n from t1;
connection locker;
--sleep 2
unlock tables;
connection writer;
reap;
connection reader;
reap;
drop table t1;

connection locker;
create table t1(n int);
insert into t1 values (1);
lock tables t1 read;
connection writer;
send update low_priority t1 set n = 4;
connection reader;
--sleep 2
send select n from t1;
connection locker;
--sleep 2
unlock tables;
connection writer;
reap;
connection reader;
reap;
drop table t1;

#
# Test problem when using locks on many tables and droping a table that
# is to-be-locked by another thread
#

connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write;
connection reader;
send insert t1 select * from t2;
connection locker;
drop table t2;
connection reader;
--error 1146
reap;
connection locker;
drop table t1;