# 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

--disable_warnings
drop table if exists t1,t2;
--enable_warnings

# 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 with multi-updates
# It should not block when multi-update is reading on a read-locked table
#

connection locker;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values(1,1);
insert into t1 values(2,2);
insert into t2 values(1,2);
lock table t1 read;
connection writer;
--sleep 2
send update t1,t2 set c=a where b=d;
connection reader;
--sleep 2
select c from t2;
connection writer;
reap;
connection locker;
drop table t1;
drop table t2;

#
# 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;

#
# Same test as above, but with the dropped table locked twice
#

connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write, t1 as t1_2 write, t2 as t2_2 write;
connection reader;
send insert t1 select * from t2;
connection locker;
drop table t2;
connection reader;
--error 1146
reap;
connection locker;
drop table t1;


# End of 4.1 tests

#
# BUG#9998 - MySQL client hangs on USE "database"
#
create table t1(a int);
lock tables t1 write;
connection reader;
show columns from t1;
connection locker;
unlock tables;
drop table t1;

#
# Bug#19815 - CREATE/RENAME/DROP DATABASE can deadlock on a global read lock
#
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
#
connection con1;
CREATE DATABASE mysqltest_1;
FLUSH TABLES WITH READ LOCK;
#
# With bug in place: acquire LOCK_mysql_create_table and
# wait in wait_if_global_read_lock().
connection con2;
send DROP DATABASE mysqltest_1;
--sleep 1
#
# With bug in place: try to acquire LOCK_mysql_create_table...
# When fixed: Reject dropping db because of the read lock.
connection con1;
--error ER_CANT_UPDATE_WITH_READLOCK
DROP DATABASE mysqltest_1;
UNLOCK TABLES;
#
connection con2;
reap;
#
connection default;
disconnect con1;
disconnect con2;
# This must have been dropped by connection 2 already,
# which waited until the global read lock was released.
--error ER_DB_DROP_EXISTS
DROP DATABASE mysqltest_1;

# Bug#16986 - Deadlock condition with MyISAM tables
#
connection locker;
use mysql;
LOCK TABLES columns_priv WRITE, db WRITE, host WRITE, user WRITE;
FLUSH TABLES;
--sleep 1
#
connection reader;
use mysql;
#NOTE:  This must be a multi-table select, otherwise the deadlock will not occur
send SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1;
--sleep 1
#
connection locker;
# Make test case independent from earlier grants.
--replace_result "Table is already up to date" "OK"
OPTIMIZE TABLES columns_priv, db, host, user;
UNLOCK TABLES;
#
connection reader;
reap;
use test;
#
connection locker;
use test;
#
connection default;

# End of 5.0 tests
