#
# Bug #22876 Four-way deadlock
#
DROP TABLE IF EXISTS t1;
# Connection 1
set @@autocommit=0;
CREATE TABLE t1(s1 INT UNIQUE) ENGINE=innodb;
INSERT INTO t1 VALUES (1);
# Connection 2
set @@autocommit=0;
INSERT INTO t1 VALUES (2);
INSERT INTO t1 VALUES (1);
# Connection 3
set @@autocommit=0;
DROP TABLE t1;
# Connection 1
# Connection 1 is now holding the lock.
# Issuing insert from connection 1 while connection 2&3 
# is waiting for the lock should give a deadlock error.
INSERT INTO t1 VALUES (2);
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
# Cleanup
commit;
set @@autocommit=1;
commit;
set @@autocommit=1;
set @@autocommit=1;
#
# Bug #42147 Concurrent DML and LOCK TABLE ... READ for InnoDB 
#            table cause warnings in errlog
#
#
# Note that this test for now relies on a global suppression of 
# the warning "Found lock of type 6 that is write and read locked"
# This suppression rule can be removed once Bug#42147 is properly
# fixed. See bug page for more info.
#
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (i INT) engine= innodb;
# Connection 2
# Get user-level lock
SELECT get_lock('bug42147_lock', 60);
get_lock('bug42147_lock', 60)
1
# Connection 1
INSERT INTO t1 SELECT get_lock('bug42147_lock', 60);
# Connection 2
LOCK TABLES t1 READ;
SELECT release_lock('bug42147_lock');
release_lock('bug42147_lock')
1
# Connection 1
# Connection 2
UNLOCK TABLES;
# Connection 1
DROP TABLE t1;