mariadb/mysql-test/t/flush_read_lock_kill.test

# Let's see if FLUSH TABLES WITH READ LOCK can be killed when waiting
# for running commits to finish (in the past it could not)
# This will not be a meaningful test on non-debug servers so will be
# skipped.

# This also won't work with the embedded server test
--source include/not_embedded.inc

--source include/have_debug.inc

# This test needs transactional engine as otherwise COMMIT
# won't block FLUSH TABLES WITH GLOBAL READ LOCK.
--source include/have_innodb.inc

# Save the initial number of concurrent sessions
--source include/count_sessions.inc

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connection con1;

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
SET DEBUG_SYNC= 'RESET';
CREATE TABLE t1 (kill_id INT) engine = InnoDB;
INSERT INTO t1 VALUES(connection_id());

--echo # Switching to connection 'default'.
connection default;
--echo # Start transaction.
BEGIN;
INSERT INTO t1 VALUES(connection_id());
--echo # Ensure that COMMIT will pause once it acquires protection
--echo # against its global read lock.
SET DEBUG_SYNC='ha_commit_trans_after_acquire_commit_lock SIGNAL acquired WAIT_FOR go';

--echo # Sending:
--send COMMIT

--echo # Switching to 'con1'.
connection con1;
--echo # Wait till COMMIT acquires protection against global read
--echo # lock and pauses.
SET DEBUG_SYNC='now WAIT_FOR acquired';
--echo # Sending:
send FLUSH TABLES WITH READ LOCK;

--echo # Switching to 'con2'.
connection con2;
SELECT ((@id := kill_id) - kill_id) FROM t1 LIMIT 1;

--echo # Wait till FLUSH TABLES WITH READ LOCK blocks due
--echo # to active COMMIT
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for commit lock"
  and info = "flush tables with read lock";
--source include/wait_condition.inc

--echo # Kill connection 'con1'.
KILL CONNECTION @id;

--echo # Switching to 'con1'.
connection con1;
--echo # Try to reap FLUSH TABLES WITH READ LOCK, 
--echo # it fail due to killed statement and connection.
--error 1317,2013
reap;

--echo # Switching to 'con2'.
connection con2;
--echo # Resume COMMIT.
SET DEBUG_SYNC='now SIGNAL go';

--echo # Switching to 'default'.
connection default;
--echo # Reaping COMMIT.
--reap
disconnect con2;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';

# Wait till all disconnects are completed
--source include/wait_until_count_sessions.inc