#
# Code coverage testing of TRUNCATE TABLE.
#
# Ingo Struewing, 2009-07-20
#

--source include/have_debug_sync.inc
SET DEBUG_SYNC='RESET';

--let $MYSQLD_DATADIR= `SELECT @@datadir`

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings

--echo #
--echo # Bug#20667 - Truncate table fails for a write locked table
--echo #
########
# Attack acquire_exclusive_locks(). Hold a global read lock.
# Non-LOCK TABLE case.
#
CREATE TABLE t1 (c1 INT);
INSERT INTO t1 VALUES (1);
#
# Start a transaction and execute a DML in it. Since 5.4.4 this leaves
# a shared meta data lock (MDL) behind. TRUNCATE shall block on it.
#
--connect (con1, localhost, root,,)
START TRANSACTION;
INSERT INTO t1 VALUES (2);
#
# Get connection id of default connection.
# Start TRUNCATE, which will block on acquire_exclusive_locks().
#
--connection default
let $ID= `SELECT @id := CONNECTION_ID()`;
SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL waiting';
send TRUNCATE TABLE t1;
#
# Get the default connection ID into a variable in an invisible statement.
# Kill the TRUNCATE query. This shall result in an error return
# from wait_while_table_is_used().
#
--connection con1
SET DEBUG_SYNC='now WAIT_FOR waiting';
let $invisible_assignment_in_select = `SELECT @id := $ID`;
KILL QUERY @id;
--connection default
--error ER_QUERY_INTERRUPTED
reap;
--connection con1
--echo # Release SW lock by committing transaction.
COMMIT;
--disconnect con1
--connection default
UNLOCK TABLES;
DROP TABLE t1;
SET DEBUG_SYNC='RESET';

--echo #
--echo # Bug#57659 Segfault in Query_cache::invalidate_data for TRUNCATE TABLE
--echo #

--echo # Note that this test case only reproduces the problem
--echo # when it is run with valgrind.

--disable_warnings
DROP TABLE IF EXISTS t1, m1;
--enable_warnings

CREATE TABLE t1(a INT) engine=memory;
CREATE TABLE m1(a INT) engine=merge UNION(t1);
connect(con2, localhost, root);

connect(con1, localhost, root);
SET DEBUG_SYNC= 'open_tables_after_open_and_process_table SIGNAL opened WAIT_FOR dropped';
--echo # Sending:
--send TRUNCATE TABLE m1

connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR opened';
--echo # Sending:
--send FLUSH TABLES m1

connection default;
--echo # Waiting for FLUSH TABLES to be blocked.
let $wait_condition= SELECT COUNT(*)=1 FROM information_schema.processlist
  WHERE state= 'Waiting for table metadata lock' AND info= 'FLUSH TABLES m1';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL dropped';

connection con1;
--echo # Reaping: TRUNCATE TABLE m1
--error ER_WRONG_MRG_TABLE
--reap
disconnect con1;
--source include/wait_until_disconnected.inc

connection con2;
--echo # Reaping: FLUSH TABLES
--reap
disconnect con2;
--source include/wait_until_disconnected.inc

connection default;
SET DEBUG_SYNC= 'RESET';
DROP TABLE m1, t1;