set global sql_mode="";
set local sql_mode="";
# FTWRL takes two global metadata locks -- a global shared
# metadata lock and the commit blocker lock.
# The first lock prevents DDL from taking place.
# Let's say that all DDL statements that take metadata
# locks form class #1 -- incompatible with FTWRL because
# take incompatible MDL table locks.
# The first global lock doesn't, however, prevent standalone
# COMMITs (or implicit COMMITs) from taking place, since a
# COMMIT doesn't take table locks. It doesn't prevent
# DDL on temporary tables either, since they don't
# take any table locks either.
# Most DDL statements do not perform an implicit commit
# if operate on a temporary table. Examples are CREATE
# TEMPORARY TABLE and DROP TEMPORARY TABLE. 
# Thus, these DDL statements can go through in presence
# of FTWRL. This is class #2 -- compatible because
# do not take incompatible MDL locks and do not issue
# implicit commit..
# (Although these operations do not commit, their effects
# cannot be rolled back either.)
# ALTER TABLE, ANALYZE, OPTIMIZE and some others always
# issue an implicit commit, even if its argument is a
# temporary table. 
# *Howewer* an implicit commit is a no-op if all engines
# used since the start of transactiona are non-
# transactional. Thus, for non-transactional engines,
# these operations are not blocked by FTWRL.
# This is class #3 -- compatible because do not take
# MDL table locks and are non-transactional. 
# On the contrary, for transactional engines, there
# is always a commit, regardless of whether a table
# is temporary or not. Thus, for example, ALTER TABLE
# for a transactional engine will wait for FTWRL, 
# even if the subject table is temporary.
# Thus ALTER TABLE <temporary> is incompatible
# with FTWRL. This is class #4 -- incompatible
# becuase issue implicit COMMIT which is not a no-op.
# Finally, there are administrative statements (such as 
# RESET SLAVE) that do not take any locks and do not
# issue COMMIT.
# This is class #5.
# The goal of this coverage is to test statements
# of all classes.
# @todo: documents the effects of @@autocommit,
# DML and temporary transactional tables.
# Use MyISAM engine for the most of the tables
# used in this test in order to be able to 
# check that DDL statements on temporary tables
# are compatible with FTRWL. 
drop tables if exists t1_base, t2_base, t3_trans;
drop tables if exists tm_base, tm_base_temp;
drop database if exists mysqltest1;
# We're going to test ALTER DATABASE UPGRADE
drop database if exists `#mysql50#mysqltest-2`;
drop procedure if exists p1;
drop function if exists f1;
drop view if exists v1;
drop procedure if exists p2;
drop function if exists f2_base;
drop function if exists f2_temp;
drop event if exists e1;
drop event if exists e2;
create table t1_base(i int) engine=myisam;
create table t2_base(j int) engine=myisam;
create table t3_trans(i int) engine=innodb;
create temporary table t1_temp(i int) engine=myisam;
create temporary table t2_temp(j int) engine=myisam;
create temporary table t3_temp_trans(i int) engine=innodb;
create database mysqltest1;
create database `#mysql50#mysqltest-2`;
create procedure p1() begin end;
create function f1() returns int return 0;
create view v1 as select 1 as i;
create procedure p2(i int) begin end;
create function f2_base() returns int
begin
insert into t1_base values (1);
return 0;
end|
create function f2_temp() returns int
begin
insert into t1_temp values (1);
return 0;
end|
create event e1 on schedule every 1 minute do begin end;
Warnings:
Warning	1105	Event scheduler is switched off, use SET GLOBAL event_scheduler=ON to enable it.
connect  con1,localhost,root,,;
connect  con2,localhost,root,,;
connect  con3,localhost,root,,;
connection default;
#
# Test compatibility of FLUSH TABLES WITH READ LOCK 
# with various statements.
#
# These tests don't cover some classes of statements:
# - Replication-related - CHANGE MASTER TO, START/STOP SLAVE and etc
#   (all compatible with FTWRL).
# - Plugin-related - INSTALL/UNINSTALL (incompatible with FTWRL,
#   require plugin support).
#
# 1) ALTER variants.
#
# 1.1) ALTER TABLE
# 
# 1.1.a) For base table should be incompatible with FTWRL.
#
Success: Was not able to run 'alter table t1_base add column c1 int' under FTWRL.
Success: 'alter table t1_base add column c1 int' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter table t1_base add column c1 int' is active in another connection.
#
# 1.1.b) For a temporary table should be compatible with FTWRL.
#
Success: Was able to run 'alter table t1_temp add column c1 int' under FTWRL.
Success: Was able to run 'alter table t1_temp add column c1 int' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'alter table t1_temp add column c1 int' was active in another connection.
#
# 1.2) ALTER DATABASE should be incompatible with FTWRL.
#
Success: Was not able to run 'alter database mysqltest1 default character set utf8' under FTWRL.
Success: 'alter database mysqltest1 default character set utf8' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter database mysqltest1 default character set utf8' is active in another connection.
#
# 1.3) ALTER DATABASE UPGRADE DATA DIRECTORY NAME should be
#      incompatible with FTWRL.
#
Success: Was not able to run 'alter database `#mysql50#mysqltest-2` upgrade data directory name' under FTWRL.
Success: 'alter database `#mysql50#mysqltest-2` upgrade data directory name' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter database `#mysql50#mysqltest-2` upgrade data directory name' is active in another connection.
#
# 1.4) ALTER PROCEDURE should be incompatible with FTWRL.
#
Success: Was not able to run 'alter procedure p1 comment 'a'' under FTWRL.
Success: 'alter procedure p1 comment 'a'' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter procedure p1 comment 'a'' is active in another connection.
#
# 1.5) ALTER FUNCTION should be incompatible with FTWRL.
#
Success: Was not able to run 'alter function f1 comment 'a'' under FTWRL.
Success: 'alter function f1 comment 'a'' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter function f1 comment 'a'' is active in another connection.
#
# 1.6) ALTER VIEW should be incompatible with FTWRL.
#
Success: Was not able to run 'alter view v1 as select 2 as j' under FTWRL.
Success: 'alter view v1 as select 2 as j' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter view v1 as select 2 as j' is active in another connection.
#
# 1.7) ALTER EVENT should be incompatible with FTWRL.
#
Success: Was not able to run 'alter event e1 comment 'test'' under FTWRL.
Success: 'alter event e1 comment 'test'' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter event e1 comment 'test'' is active in another connection.
#
# 1.x) The rest of ALTER statements (ALTER TABLESPACE,
#      ALTER LOGFILE GROUP and ALTER SERVER) are too
#      special to be tested here.
#
#
# 2) ANALYZE TABLE statement is compatible with FTWRL.
# See Bug#43336 ANALYZE and OPTIMIZE do not honour
#  --read-only as they update status tables.
#
Success: Was not able to run 'analyze table t1_base' under FTWRL.
Success: 'analyze table t1_base' is blocked by FTWRL active in another connection.
#
# 3) BEGIN, ROLLBACK and COMMIT statements.
#    BEGIN and ROLLBACK are compatible with FTWRL.
#    COMMIT is not.
# 
# We need a special test for these statements as
# FTWRL commits a transaction and because COMMIT
# is handled in a special way.
flush tables with read lock;
begin;
# ROLLBACK is allowed under FTWRL although there
# no much sense in it. FTWRL commits any previous
# changes and doesn't allows any DML after it.
# So such a ROLLBACK is always a no-op.
rollback;
# Although COMMIT is incompatible with FTWRL in
# other senses it is still allowed under FTWRL.
# This fact relied upon by some versions of
# innobackup tool.
# Similarly to ROLLBACK it is a no-op in this situation.
commit;
unlock tables;
# Check that BEGIN/ROLLBACK are not blocked and 
# COMMIT is blocked by active FTWRL in another
# connection.
#
connection con1;
flush tables with read lock;
connection default;
begin;
connection con1;
unlock tables;
connection default;
# Do some work so ROLLBACK is not a no-op.
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
rollback;
connection con1;
unlock tables;
connection default;
begin;
# Do some work so COMMIT is not a no-op.
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
# Send:
commit;
connection con1;
# Wait until COMMIT is blocked.
unlock tables;
connection default;
# Reap COMMIT.
delete from t3_trans;
#
# Check that COMMIT blocks FTWRL in another connection.
begin;
insert into t3_trans values (1);
set debug_sync='RESET';
set debug_sync='ha_commit_trans_after_acquire_commit_lock SIGNAL parked WAIT_FOR go';
commit;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
connection con2;
# Wait until FTWRL is blocked.
set debug_sync='now SIGNAL go';
connection default;
# Reap COMMIT.
connection con1;
# Reap FTWRL.
unlock tables;
connection default;
delete from t3_trans;
set debug_sync= "RESET";
# We don't run similar test for BEGIN and ROLLBACK as
# they release metadata locks in non-standard place.
#
# 4) BINLOG statement should be incompatible with FTWRL.
#
#
# Provide format description BINLOG statement first.
BINLOG '
MfmqTA8BAAAAZwAAAGsAAAABAAQANS41LjctbTMtZGVidWctbG9nAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAx+apMEzgNAAgAEgAEBAQEEgAAVAAEGggAAAAICAgCAA==
';
# Now test compatibility for BINLOG statement which is 
# equivalent to INSERT INTO t1_base VALUES (1).
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was not able to run 'BINLOG '
MfmqTBMBAAAALgAAAN0AAAAAACgAAAAAAAEABHRlc3QAB3QxX2Jhc2UAAQMAAQ==
MfmqTBcBAAAAIgAAAP8AAAAAACgAAAAAAAEAAf/+AQAAAA==
'' under FTWRL.
Success: 'BINLOG '
MfmqTBMBAAAALgAAAN0AAAAAACgAAAAAAAEABHRlc3QAB3QxX2Jhc2UAAQMAAQ==
MfmqTBcBAAAAIgAAAP8AAAAAACgAAAAAAAEAAf/+AQAAAA==
'' is blocked by FTWRL active in another connection.
#
# 5) CALL statement. This statement uses resources in two
#    ways: through expressions used as parameters and through
#    sub-statements. This test covers only usage through
#    parameters as sub-statements do locking individually.
#
# 5.a) In simple cases a parameter expression should be
#      compatible with FTWRL.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'call p2((select count(*) from t1_base))' under FTWRL.
Success: Was able to run 'call p2((select count(*) from t1_base))' with FTWRL active in another connection.
#
# 5.b) In case when an expression uses function which updates
#      base tables CALL should be incompatible with FTWRL.
#
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was not able to run 'call p2(f2_base())' under FTWRL.
Success: 'call p2(f2_base())' is blocked by FTWRL active in another connection.
#
# 5.c) If function used as argument updates temporary tables
#      CALL statement should be compatible with FTWRL.
#
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'call p2(f2_temp())' under FTWRL.
Success: Was able to run 'call p2(f2_temp())' with FTWRL active in another connection.
#
# 6) CHECK TABLE statement is compatible with FTWRL.
#
Success: Was able to run 'check table t1_base' under FTWRL.
Success: Was able to run 'check table t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'check table t1_base' was active in another connection.
#
# 7) CHECKSUM TABLE statement is compatible with FTWRL.
#
Success: Was able to run 'checksum table t1_base' under FTWRL.
Success: Was able to run 'checksum table t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'checksum table t1_base' was active in another connection.
#
# 8) CREATE variants.
#
# 8.1) CREATE TABLE statement.
#
# 8.1.a) CREATE TABLE is incompatible with FTWRL when
#        base table is created.
Success: Was not able to run 'create table t3_base(i int)' under FTWRL.
Success: 'create table t3_base(i int)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create table t3_base(i int)' is active in another connection.
# 8.1.b) CREATE TABLE is compatible with FTWRL when
#        temporary table is created.
Success: Was able to run 'create temporary table t3_temp(i int)' under FTWRL.
Success: Was able to run 'create temporary table t3_temp(i int)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'create temporary table t3_temp(i int)' was active in another connection.
# 8.1.c) CREATE TABLE LIKE is incompatible with FTWRL when
#        base table is created.
Success: Was not able to run 'create table t3_base like t1_temp' under FTWRL.
Success: 'create table t3_base like t1_temp' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create table t3_base like t1_temp' is active in another connection.
# 8.1.d) CREATE TABLE LIKE is compatible with FTWRL when
#        temporary table is created.
Success: Was able to run 'create temporary table t3_temp like t1_base' under FTWRL.
Success: Was able to run 'create temporary table t3_temp like t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'create temporary table t3_temp like t1_base' was active in another connection.
# 8.1.e) CREATE TABLE SELECT is incompatible with FTWRL when
#        base table is created.
Success: Was not able to run 'create table t3_base select 1 as i' under FTWRL.
Success: 'create table t3_base select 1 as i' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create table t3_base select 1 as i' is active in another connection.
# 8.1.f) CREATE TABLE SELECT is compatible with FTWRL when
#        temporary table is created.
Success: Was able to run 'create temporary table t3_temp select 1 as i' under FTWRL.
Success: Was able to run 'create temporary table t3_temp select 1 as i' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'create temporary table t3_temp select 1 as i' was active in another connection.
# 8.2) CREATE INDEX statement.
#
# 8.2.a) CREATE INDEX is incompatible with FTWRL when
#        applied to base table.
Success: Was not able to run 'create index i on t1_base (i)' under FTWRL.
Success: 'create index i on t1_base (i)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create index i on t1_base (i)' is active in another connection.
# 8.2.b) CREATE INDEX is compatible with FTWRL when
#        applied to temporary table.
Success: Was able to run 'create index i on t1_temp (i)' under FTWRL.
Success: Was able to run 'create index i on t1_temp (i)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'create index i on t1_temp (i)' was active in another connection.
#
# 8.3) CREATE DATABASE is incompatible with FTWRL.
#
Success: Was not able to run 'create database mysqltest2' under FTWRL.
Success: 'create database mysqltest2' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create database mysqltest2' is active in another connection.
#
# 8.4) CREATE VIEW is incompatible with FTWRL.
#
Success: Was not able to run 'create view v2 as select 1 as j' under FTWRL.
Success: 'create view v2 as select 1 as j' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create view v2 as select 1 as j' is active in another connection.
#
# 8.5) CREATE TRIGGER is incompatible with FTWRL.
#
Success: Was not able to run 'create trigger t1_bi before insert on t1_base for each row begin end' under FTWRL.
Success: 'create trigger t1_bi before insert on t1_base for each row begin end' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create trigger t1_bi before insert on t1_base for each row begin end' is active in another connection.
#
# 8.6) CREATE FUNCTION is incompatible with FTWRL.
#
Success: Was not able to run 'create function f2() returns int return 0' under FTWRL.
Success: 'create function f2() returns int return 0' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create function f2() returns int return 0' is active in another connection.
#
# 8.7) CREATE PROCEDURE is incompatible with FTWRL.
#
Success: Was not able to run 'create procedure p3() begin end' under FTWRL.
Success: 'create procedure p3() begin end' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create procedure p3() begin end' is active in another connection.
#
# 8.8) CREATE EVENT should be incompatible with FTWRL.
#
Success: Was not able to run 'create event e2 on schedule every 1 minute do begin end' under FTWRL.
Success: 'create event e2 on schedule every 1 minute do begin end' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create event e2 on schedule every 1 minute do begin end' is active in another connection.
#
# 8.9) CREATE USER should be incompatible with FTWRL.
#
Success: Was not able to run 'create user mysqltest_u1' under FTWRL.
Success: 'create user mysqltest_u1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'create user mysqltest_u1' is active in another connection.
#
# 8.x) The rest of CREATE variants (CREATE LOGFILE GROUP,
#      CREATE TABLESPACE and CREATE SERVER) are too special
#      to test here.
#
#
# 9) PREPARE, EXECUTE and DEALLOCATE PREPARE statements.
#
# 9.1) PREPARE statement is compatible with FTWRL as it
#      doesn't change any data.
# 
# 9.1.a) Prepare of simple INSERT statement.
#
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'prepare stmt1 from 'insert into t1_base values (1)'' under FTWRL.
Success: Was able to run 'prepare stmt1 from 'insert into t1_base values (1)'' with FTWRL active in another connection.
#
# 9.1.b) Prepare of multi-UPDATE. At some point such statements
#        tried to acquire thr_lock.c locks during prepare phase.
#        This no longer happens and thus it is compatible with
#        FTWRL.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'prepare stmt1 from 'update t1_base, t2_base set t1_base.i= 1 where t1_base.i = t2_base.j'' under FTWRL.
Success: Was able to run 'prepare stmt1 from 'update t1_base, t2_base set t1_base.i= 1 where t1_base.i = t2_base.j'' with FTWRL active in another connection.
#
# 9.1.c) Prepare of multi-DELETE. Again PREPARE of such
#        statement should be compatible with FTWRL.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'prepare stmt1 from 'delete t1_base from t1_base, t2_base where t1_base.i = t2_base.j'' under FTWRL.
Success: Was able to run 'prepare stmt1 from 'delete t1_base from t1_base, t2_base where t1_base.i = t2_base.j'' with FTWRL active in another connection.
#
# 9.2) Compatibility of EXECUTE statement depends on statement
#     to be executed.
#
# 9.2.a) EXECUTE for statement which is itself compatible with
#       FTWRL should be compatible.
prepare stmt1 from 'select * from t1_base';
Success: Was able to run 'execute stmt1' under FTWRL.
Success: Was able to run 'execute stmt1' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'execute stmt1' was active in another connection.
deallocate prepare stmt1;
call mtr.add_suppression("Slave SQL.*Can.t execute the query because you have a conflicting read lock., error.* 1223");
#
# 9.2.b) EXECUTE for statement which is incompatible with FTWRL
#        should be also incompatible.
#
# Check that EXECUTE is not allowed under FTWRL.
prepare stmt1 from 'insert into t1_base values (1)';
flush tables with read lock;
execute stmt1;
ERROR HY000: Can't execute the query because you have a conflicting read lock
unlock tables;
# Check that active FTWRL in another connection
# blocks EXECUTE which changes data.
#
connection con1;
flush tables with read lock;
connection default;
execute stmt1 ;
connection con1;
# Check that EXECUTE is blocked.
unlock tables;
connection default;
# Reap EXECUTE.
set debug_sync='RESET';
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
execute stmt1; ;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
connection con2;
# Wait until FTWRL is blocked.
set debug_sync='now SIGNAL go';
connection default;
# Reap EXECUTE.
connection con1;
# Reap FTWRL.
unlock tables;
connection default;
set debug_sync= "RESET";
delete from t1_base;
deallocate prepare stmt1;
#
# 9.3) DEALLOCATE PREPARE is compatible with FTWRL.
#
prepare stmt1 from 'insert into t1_base values (1)';
Success: Was able to run 'deallocate prepare stmt1' under FTWRL.
Success: Was able to run 'deallocate prepare stmt1' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'deallocate prepare stmt1' was active in another connection.
deallocate prepare stmt1;
#
# 10) DELETE variations.
#
# 10.1) Simple DELETE.
# 
# 10.1.a) Simple DELETE on base table is incompatible with FTWRL.
Success: Was not able to run 'delete from t1_base' under FTWRL.
Success: 'delete from t1_base' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'delete from t1_base' is active in another connection.
# 
# 10.1.b) Simple DELETE on temporary table is compatible with FTWRL.
Success: Was able to run 'delete from t1_temp' under FTWRL.
Success: Was able to run 'delete from t1_temp' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'delete from t1_temp' was active in another connection.
#
# 10.2) Multi DELETE.
# 
# 10.2.a) Multi DELETE on base tables is incompatible with FTWRL.
Success: Was not able to run 'delete t1_base from t1_base, t2_base where t1_base.i = t2_base.j' under FTWRL.
Success: 'delete t1_base from t1_base, t2_base where t1_base.i = t2_base.j' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'delete t1_base from t1_base, t2_base where t1_base.i = t2_base.j' is active in another connection.
# 
# 10.2.b) Multi DELETE on temporary tables is compatible with FTWRL.
Success: Was able to run 'delete t1_temp from t1_temp, t2_temp where t1_temp.i = t2_temp.j' under FTWRL.
Success: Was able to run 'delete t1_temp from t1_temp, t2_temp where t1_temp.i = t2_temp.j' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'delete t1_temp from t1_temp, t2_temp where t1_temp.i = t2_temp.j' was active in another connection.
#
# 11) DESCRIBE should be compatible with FTWRL.
#
Success: Was able to run 'describe t1_base' under FTWRL.
Success: Was able to run 'describe t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'describe t1_base' was active in another connection.
#
# 12) Compatibility of DO statement with FTWRL depends on its
#     expression.
#
# 12.a) DO with expression which does not change base table
#       should be compatible with FTWRL.
Success: Was able to run 'do (select count(*) from t1_base)' under FTWRL.
Success: Was able to run 'do (select count(*) from t1_base)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'do (select count(*) from t1_base)' was active in another connection.
#
# 12.b) DO which calls SF updating base table should be
#       incompatible with FTWRL.
Success: Was not able to run 'do f2_base()' under FTWRL.
Success: 'do f2_base()' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'do f2_base()' is active in another connection.
#
# 12.c) DO which calls SF updating temporary table should be
#       compatible with FTWRL.
Success: Was able to run 'do f2_temp()' under FTWRL.
Success: Was able to run 'do f2_temp()' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'do f2_temp()' was active in another connection.
#
# 13) DROP variants.
#
# 13.1) DROP TABLES.
#
# 13.1.a) DROP TABLES which affects base tables is incompatible
#         with FTWRL.
Success: Was not able to run 'drop table t2_base' under FTWRL.
Success: 'drop table t2_base' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop table t2_base' is active in another connection.
# 13.1.b) DROP TABLES which affects only temporary tables
#         is compatible with FTWRL.
Success: Was able to run 'drop table t2_temp' under FTWRL.
Success: Was able to run 'drop table t2_temp' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'drop table t2_temp' was active in another connection.
#
# 13.1.c) DROP TEMPORARY TABLES should be compatible with FTWRL.
Success: Was able to run 'drop temporary table t2_temp' under FTWRL.
Success: Was able to run 'drop temporary table t2_temp' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'drop temporary table t2_temp' was active in another connection.
#
# 13.2) DROP INDEX.
#
# 13.2.a) DROP INDEX on a base table is incompatible with FTWRL.
create index i on t1_base (i);
Success: Was not able to run 'drop index i on t1_base' under FTWRL.
Success: 'drop index i on t1_base' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop index i on t1_base' is active in another connection.
drop index i on t1_base;
#
# 13.2.b) DROP INDEX on a temporary table is compatible with FTWRL.
create index i on t1_temp (i);
Success: Was able to run 'drop index i on t1_temp' under FTWRL.
Success: Was able to run 'drop index i on t1_temp' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'drop index i on t1_temp' was active in another connection.
drop index i on t1_temp;
#
# 13.3) DROP DATABASE is incompatible with FTWRL
#
Success: Was not able to run 'drop database mysqltest1' under FTWRL.
Success: 'drop database mysqltest1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop database mysqltest1' is active in another connection.
#
# 13.4) DROP FUNCTION is incompatible with FTWRL.
#
Success: Was not able to run 'drop function f1' under FTWRL.
Success: 'drop function f1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop function f1' is active in another connection.
#
# 13.5) DROP PROCEDURE is incompatible with FTWRL.
#
Success: Was not able to run 'drop procedure p1' under FTWRL.
Success: 'drop procedure p1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop procedure p1' is active in another connection.
#
# 13.6) DROP USER should be incompatible with FTWRL.
#
create user mysqltest_u1;
Success: Was not able to run 'drop user mysqltest_u1' under FTWRL.
Success: 'drop user mysqltest_u1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop user mysqltest_u1' is active in another connection.
drop user mysqltest_u1;
#
# 13.7) DROP VIEW should be incompatible with FTWRL.
#
Success: Was not able to run 'drop view v1' under FTWRL.
Success: 'drop view v1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop view v1' is active in another connection.
#
# 13.8) DROP EVENT should be incompatible with FTWRL.
#
Success: Was not able to run 'drop event e1' under FTWRL.
Success: 'drop event e1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop event e1' is active in another connection.
#
# 13.9) DROP TRIGGER is incompatible with FTWRL.
#
create trigger t1_bi before insert on t1_base for each row begin end;
Success: Was not able to run 'drop trigger t1_bi' under FTWRL.
Success: 'drop trigger t1_bi' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'drop trigger t1_bi' is active in another connection.
drop trigger t1_bi;
#
# 13.x) The rest of DROP variants (DROP TABLESPACE, DROP LOGFILE
#       GROUP and DROP SERVER) are too special to test here.
#
#
# 14) FLUSH variants.
#
# Test compatibility of _some_ important FLUSH variants with FTWRL.
#
# 14.1) FLUSH TABLES WITH READ LOCK is compatible with itself.
# 
# Check that FTWRL statements can be run while FTWRL
# is active in another connection.
#
flush tables with read lock;
# The second FTWRL in a row is allowed at the moment.
# It does not make much sense as it does only flush.
flush tables with read lock;
unlock tables;
connection con1;
flush tables with read lock;
connection default;
flush tables with read lock;
unlock tables;
connection con1;
unlock tables;
connection default;
#
# 14.2) FLUSH TABLES <list> WITH READ LOCK is not blocked by
#       active FTWRL. But since the latter keeps tables open
#       FTWRL is blocked by FLUSH TABLES <list> WITH READ LOCK.
#       Fixed by MDEV-5336
flush tables with read lock;
# FT <list> WRL is allowed under FTWRL at the moment.
# It does not make much sense though.
flush tables t1_base, t2_base with read lock;
unlock tables;
connection con1;
flush tables with read lock;
connection default;
flush tables t1_base, t2_base with read lock;
unlock tables;
connection con1;
unlock tables;
connection default;
flush tables t1_base, t2_base with read lock;
connection con1;
flush tables with read lock;
connection default;
unlock tables;
connection con1;
unlock tables;
connection default;
#
# 14.3) FLUSH TABLES is compatible with FTWRL.
Success: Was able to run 'flush tables' under FTWRL.
Success: Was able to run 'flush tables' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'flush tables' was active in another connection.
#
# 14.4) FLUSH TABLES <list> is compatible with FTWRL.
Success: Was able to run 'flush table t1_base, t2_base' under FTWRL.
Success: Was able to run 'flush table t1_base, t2_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'flush table t1_base, t2_base' was active in another connection.
#
# 14.5) FLUSH PRIVILEGES is compatible with FTWRL.
Success: Was able to run 'flush privileges' under FTWRL.
Success: Was able to run 'flush privileges' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'flush privileges' was active in another connection.
#
# 15) GRANT statement should be incompatible with FTWRL.
#
Success: Was not able to run 'grant all privileges on t1_base to mysqltest_u1' under FTWRL.
Success: 'grant all privileges on t1_base to mysqltest_u1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'grant all privileges on t1_base to mysqltest_u1' is active in another connection.
drop user mysqltest_u1;
#
# 16) All HANDLER variants are half-compatible with FTWRL.
#     I.e. they are not blocked by active FTWRL. But since open
#     HANDLER means open table instance FTWRL is blocked while
#     HANDLER is not closed.
#
# Check that HANDLER statements succeed under FTWRL.
flush tables with read lock;
handler t1_base open;
handler t1_base read first;
i
handler t1_base close;
unlock tables;
# Check that HANDLER statements can be run while FTWRL
# is active in another connection.
#
connection con1;
flush tables with read lock;
connection default;
handler t1_base open;
handler t1_base read first;
i
handler t1_base close;
connection con1;
unlock tables;
connection default;
#
# 17) HELP statement is compatible with FTWRL.
#
Success: Was able to run 'help no_such_topic' under FTWRL.
Success: Was able to run 'help no_such_topic' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'help no_such_topic' was active in another connection.
#
# 18) INSERT statement.
# 
# 18.a) Ordinary INSERT into base table is incompatible with FTWRL.
Success: Was not able to run 'insert into t1_base values (1)' under FTWRL.
Success: 'insert into t1_base values (1)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'insert into t1_base values (1)' is active in another connection.
#
# 18.b) Ordinary INSERT into temp table is compatible with FTWRL.
Success: Was able to run 'insert into t1_temp values (1)' under FTWRL.
Success: Was able to run 'insert into t1_temp values (1)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'insert into t1_temp values (1)' was active in another connection.
#
# 18.c) INSERT DELAYED is incompatible with FTWRL.
Success: Was not able to run 'insert delayed into t1_base values (1)' under FTWRL.
Success: 'insert delayed into t1_base values (1)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'insert delayed into t1_base values (1)' is active in another connection.
delete from t1_base;
# 
# 18.d) INSERT SELECT into base table is incompatible with FTWRL.
Success: Was not able to run 'insert into t1_base select * from t1_temp' under FTWRL.
Success: 'insert into t1_base select * from t1_temp' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'insert into t1_base select * from t1_temp' is active in another connection.
#
# 18.e) INSERT SELECT into temp table is compatible with FTWRL.
Success: Was able to run 'insert into t1_temp select * from t1_base' under FTWRL.
Success: Was able to run 'insert into t1_temp select * from t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'insert into t1_temp select * from t1_base' was active in another connection.
#
# 19) KILL statement is compatible with FTWRL.
#
# Check that KILL can be run under FTWRL.
flush tables with read lock;
set @id:= connection_id();
kill query @id;
ERROR 70100: Query execution was interrupted
unlock tables;
# Check that KILL statements can be run while FTWRL
# is active in another connection.
#
connection con1;
flush tables with read lock;
connection default;
kill query @id;
ERROR 70100: Query execution was interrupted
connection con1;
unlock tables;
connection default;
# Finally check that KILL doesn't block FTWRL
set debug_sync='RESET';
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
kill query @id;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
unlock tables;
set debug_sync='now SIGNAL go';
connection default;
# Reap KILL. 
ERROR 70100: Query execution was interrupted
set debug_sync='RESET';
#
# 20) LOAD DATA statement.
# 
# 20.a) LOAD DATA into base table is incompatible with FTWRL.
Success: Was not able to run 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_base (@dummy, i)' under FTWRL.
Success: 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_base (@dummy, i)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_base (@dummy, i)' is active in another connection.
# 
# 20.b) LOAD DATA into temporary table is compatible with FTWRL.
Success: Was able to run 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_temp (@dummy, i)' under FTWRL.
Success: Was able to run 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_temp (@dummy, i)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'load data infile '../../std_data/rpl_loaddata.dat' into table t1_temp (@dummy, i)' was active in another connection.
#
# 21) LOCK/UNLOCK TABLES statements.
#
# LOCK TABLES statement always (almost) blocks FTWRL as it
# keeps tables open until UNLOCK TABLES.
# Active FTWRL on the other hand blocks only those
# LOCK TABLES which allow updating of base tables.
#
# 21.a) LOCK TABLES READ is allowed under FTWRL and
#       is not blocked by active FTWRL.
flush tables with read lock;
lock tables t1_base read;
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
lock tables t1_base read;
unlock tables;
connection con1;
unlock tables;
connection default;
#
# 21.b) LOCK TABLES WRITE on a base table is disallowed
#       under FTWRL and should be blocked by active FTWRL.
flush tables with read lock;
lock tables t1_base write;
ERROR HY000: Can't execute the query because you have a conflicting read lock
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
lock tables t1_base write ;
connection con1;
# Check that LOCK TABLES WRITE is blocked.
unlock tables;
connection default;
# Reap LOCK TABLES WRITE
unlock tables;
#
# 21.c) LOCK TABLES WRITE on temporary table doesn't
#       make much sense but is allowed under FTWRL
#       and should not be blocked by active FTWRL.
flush tables with read lock;
lock tables t1_temp write;
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
lock tables t1_temp write;
unlock tables;
connection con1;
unlock tables;
connection default;
#
# 22) OPTIMIZE TABLE statement.
#
# 22.a) OPTIMIZE TABLE of base table is incompatible with FTWRL.
flush tables with read lock;
# OPTIMIZE statement returns errors as part of result-set.
optimize table t1_base;
Table	Op	Msg_type	Msg_text
test.t1_base	optimize	Error	Can't execute the query because you have a conflicting read lock
test.t1_base	optimize	error	Corrupt
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
optimize table t1_base;
connection con1;
# Check that OPTIMIZE TABLE is blocked.
unlock tables;
connection default;
# Reap OPTIMIZE TABLE
Table	Op	Msg_type	Msg_text
test.t1_base	optimize	status	OK
# We don't check that active OPTIMIZE TABLE blocks
# FTWRL as this one of statements releasing metadata
# locks in non-standard place.
#
# 22.b) OPTIMIZE TABLE of temporary table is compatible with FTWRL.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'optimize table t1_temp' under FTWRL.
Success: Was able to run 'optimize table t1_temp' with FTWRL active in another connection.
#
# 23) CACHE statement is compatible with FTWRL.
#
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'cache index t1_base in default' under FTWRL.
Success: Was able to run 'cache index t1_base in default' with FTWRL active in another connection.
#
# 24) LOAD INDEX statement is compatible with FTWRL.
#
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'load index into cache t1_base' under FTWRL.
Success: Was able to run 'load index into cache t1_base' with FTWRL active in another connection.
#
# 25) SAVEPOINT/RELEASE SAVEPOINT/ROLLBACK TO SAVEPOINT are
#     compatible with FTWRL.
#
# Since manipulations on savepoint have to be done
# inside transaction and FTWRL commits transaction we
# need a special test for these statements.
flush tables with read lock;
begin;
savepoint sv1;
rollback to savepoint sv1;
release savepoint sv1;
unlock tables;
commit;
# Check that these statements are not blocked by
# active FTWRL in another connection.
#
connection con1;
flush tables with read lock;
connection default;
begin;
connection con1;
unlock tables;
connection default;
# Do some changes to avoid SAVEPOINT and friends
# being almost no-ops.
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
savepoint sv1;
connection con1;
unlock tables;
connection default;
insert into t3_trans values (2);
connection con1;
flush tables with read lock;
connection default;
rollback to savepoint sv1;
release savepoint sv1;
connection con1;
unlock tables;
connection default;
rollback;
# Check that these statements don't block FTWRL in
# another connection.
begin;
# Do some changes to avoid SAVEPOINT and friends
# being almost no-ops.
insert into t3_trans values (1);
set debug_sync='RESET';
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
savepoint sv1;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
unlock tables;
set debug_sync='now SIGNAL go';
connection default;
# Reap SAVEPOINT
insert into t3_trans values (2);
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
rollback to savepoint sv1;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
unlock tables;
set debug_sync='now SIGNAL go';
connection default;
# Reap ROLLBACK TO SAVEPOINT
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
release savepoint sv1;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
unlock tables;
set debug_sync='now SIGNAL go';
connection default;
# Reap RELEASE SAVEPOINT
rollback;
set debug_sync= "RESET";
#
# 26) RENAME variants.
#
# 26.1) RENAME TABLES is incompatible with FTWRL.
Success: Was not able to run 'rename table t1_base to t3_base' under FTWRL.
Success: 'rename table t1_base to t3_base' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'rename table t1_base to t3_base' is active in another connection.
#
# 26.2) RENAME USER is incompatible with FTWRL.
create user mysqltest_u1;
Success: Was not able to run 'rename user mysqltest_u1 to mysqltest_u2' under FTWRL.
Success: 'rename user mysqltest_u1 to mysqltest_u2' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'rename user mysqltest_u1 to mysqltest_u2' is active in another connection.
drop user mysqltest_u1;
#
# 27) REPAIR TABLE statement.
#
# 27.a) REPAIR TABLE of base table is incompatible with FTWRL.
flush tables with read lock;
# REPAIR statement returns errors as part of result-set.
repair table t1_base;
Table	Op	Msg_type	Msg_text
test.t1_base	repair	Error	Can't execute the query because you have a conflicting read lock
test.t1_base	repair	error	Corrupt
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
repair table t1_base;
connection con1;
# Check that REPAIR TABLE is blocked.
unlock tables;
connection default;
# Reap REPAIR TABLE
Table	Op	Msg_type	Msg_text
test.t1_base	repair	status	OK
# We don't check that active REPAIR TABLE blocks
# FTWRL as this one of statements releasing metadata
# locks in non-standard place.
#
# 27.b) REPAIR TABLE of temporary table is compatible with FTWRL.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'repair table t1_temp' under FTWRL.
Success: Was able to run 'repair table t1_temp' with FTWRL active in another connection.
#
# 28) REPLACE statement.
# 
# 28.a) Ordinary REPLACE into base table is incompatible with FTWRL.
Success: Was not able to run 'replace into t1_base values (1)' under FTWRL.
Success: 'replace into t1_base values (1)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'replace into t1_base values (1)' is active in another connection.
#
# 28.b) Ordinary REPLACE into temp table is compatible with FTWRL.
Success: Was able to run 'replace into t1_temp values (1)' under FTWRL.
Success: Was able to run 'replace into t1_temp values (1)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'replace into t1_temp values (1)' was active in another connection.
# 
# 28.c) REPLACE SELECT into base table is incompatible with FTWRL.
Success: Was not able to run 'replace into t1_base select * from t1_temp' under FTWRL.
Success: 'replace into t1_base select * from t1_temp' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'replace into t1_base select * from t1_temp' is active in another connection.
#
# 28.d) REPLACE SELECT into temp table is compatible with FTWRL.
Success: Was able to run 'replace into t1_temp select * from t1_base' under FTWRL.
Success: Was able to run 'replace into t1_temp select * from t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'replace into t1_temp select * from t1_base' was active in another connection.
#
# 29) REVOKE variants.
# 
# 29.1) REVOKE privileges is incompatible with FTWRL. 
grant all privileges on t1_base to mysqltest_u1;
Success: Was not able to run 'revoke all privileges on t1_base from mysqltest_u1' under FTWRL.
Success: 'revoke all privileges on t1_base from mysqltest_u1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'revoke all privileges on t1_base from mysqltest_u1' is active in another connection.
# 
# 29.2) REVOKE ALL PRIVILEGES, GRANT OPTION is incompatible with FTWRL.
Success: Was not able to run 'revoke all privileges, grant option from mysqltest_u1' under FTWRL.
Success: 'revoke all privileges, grant option from mysqltest_u1' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'revoke all privileges, grant option from mysqltest_u1' is active in another connection.
drop user mysqltest_u1;
#
# 30) Compatibility of SELECT statement with FTWRL depends on
#     locking mode used and on functions being invoked by it.
#
# 30.a) Simple SELECT which does not change tables should be
#       compatible with FTWRL.
Success: Was able to run 'select count(*) from t1_base' under FTWRL.
Success: Was able to run 'select count(*) from t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'select count(*) from t1_base' was active in another connection.
# 30.b) SELECT ... FOR UPDATE is incompatible with FTWRL.
Success: Was not able to run 'select count(*) from t1_base for update' under FTWRL.
Success: 'select count(*) from t1_base for update' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'select count(*) from t1_base for update' is active in another connection.
# 30.c) SELECT ... LOCK IN SHARE MODE is compatible with FTWRL.
Success: Was able to run 'select count(*) from t1_base lock in share mode' under FTWRL.
Success: Was able to run 'select count(*) from t1_base lock in share mode' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'select count(*) from t1_base lock in share mode' was active in another connection.
#
# 30.d) SELECT which calls SF updating base table should be
#       incompatible with FTWRL.
Success: Was not able to run 'select f2_base()' under FTWRL.
Success: 'select f2_base()' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'select f2_base()' is active in another connection.
#
# 30.e) SELECT which calls SF updating temporary table should be
#       compatible with FTWRL.
Success: Was able to run 'select f2_temp()' under FTWRL.
Success: Was able to run 'select f2_temp()' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'select f2_temp()' was active in another connection.
#
# 31) Compatibility of SET statement with FTWRL depends on its
#     expression and on whether it is a special SET statement.
#
# 31.a) Ordinary SET with expression which does not
#       changes base table should be compatible with FTWRL.
# Skip last part of compatibility testing as our helper debug
# sync-point doesn't work for SET statements.
Success: Was able to run 'set @a:= (select count(*) from t1_base)' under FTWRL.
Success: Was able to run 'set @a:= (select count(*) from t1_base)' with FTWRL active in another connection.
#
# 31.b) Ordinary SET which calls SF updating base table should
#       be incompatible with FTWRL.
# Skip last part of compatibility testing as our helper debug
# sync-point doesn't work for SET statements.
Success: Was not able to run 'set @a:= f2_base()' under FTWRL.
Success: 'set @a:= f2_base()' is blocked by FTWRL active in another connection.
#
# 31.c) Ordinary SET which calls SF updating temporary table
#       should be compatible with FTWRL.
# Skip last part of compatibility testing as our helper debug
# sync-point doesn't work for SET statements.
Success: Was able to run 'set @a:= f2_temp()' under FTWRL.
Success: Was able to run 'set @a:= f2_temp()' with FTWRL active in another connection.
#
# 31.d) Special SET variants have different compatibility with FTWRL.
#
# 31.d.I) SET PASSWORD is incompatible with FTWRL as it changes data.
create user mysqltest_u1;
# Skip last part of compatibility testing as our helper debug
# sync-point doesn't work for SET statements.
Success: Was not able to run 'set password for 'mysqltest_u1' = password('')' under FTWRL.
Success: 'set password for 'mysqltest_u1' = password('')' is blocked by FTWRL active in another connection.
drop user mysqltest_u1;
#
# 31.d.II) SET READ_ONLY is compatible with FTWRL (but has no
#          effect when executed under it).
# Skip last part of compatibility testing as our helper debug
# sync-point doesn't work for SET statements.
Success: Was able to run 'set global read_only= 1' under FTWRL.
Success: Was able to run 'set global read_only= 1' with FTWRL active in another connection.
#
# 31.d.III) Situation with SET AUTOCOMMIT is complex.
#           Turning auto-commit off is always compatible with FTWRL.
#           Turning auto-commit on causes implicit commit and so
#           is incompatible with FTWRL if there are changes to be
#           committed.
flush tables with read lock;
set autocommit= 0;
# Turning auto-commit on causes implicit commit so can
# be incompatible with FTWRL if there is something to
# commit. But since even in this case we allow commits
# under active FTWRL such statement should always succeed.
insert into t3_temp_trans values (1);
set autocommit= 1;
unlock tables;
delete from t3_temp_trans;
# Check that SET AUTOCOMMIT=0 is not blocked and 
# SET AUTOCOMMIT=1 is blocked by active FTWRL in
# another connection.
#
connection con1;
flush tables with read lock;
connection default;
set autocommit= 0;
connection con1;
unlock tables;
connection default;
# Do some work so implicit commit in SET AUTOCOMMIT=1 
# is not a no-op.
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
# Send:
set autocommit= 1;
connection con1;
# Wait until SET AUTOCOMMIT=1 is blocked.
unlock tables;
connection default;
# Reap SET AUTOCOMMIT=1.
delete from t3_trans;
#
# Check that SET AUTOCOMMIT=1 blocks FTWRL in another connection.
set autocommit= 0;
insert into t3_trans values (1);
set debug_sync='RESET';
set debug_sync='ha_commit_trans_after_acquire_commit_lock SIGNAL parked WAIT_FOR go';
set autocommit= 1;
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
connection con2;
# Wait until FTWRL is blocked.
set debug_sync='now SIGNAL go';
connection default;
# Reap SET AUTOCOMMIT=1.
connection con1;
# Reap FTWRL.
unlock tables;
connection default;
delete from t3_trans;
set debug_sync= "RESET";
#
# 32) SHOW statements are compatible with FTWRL.
#     Let us test _some_ of them.
#
# 32.1) SHOW TABLES.
Success: Was able to run 'show tables from test' under FTWRL.
Success: Was able to run 'show tables from test' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show tables from test' was active in another connection.
#
# 32.1) SHOW TABLES.
Success: Was able to run 'show tables from test' under FTWRL.
Success: Was able to run 'show tables from test' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show tables from test' was active in another connection.
#
# 32.2) SHOW EVENTS.
Success: Was able to run 'show events from test' under FTWRL.
Success: Was able to run 'show events from test' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show events from test' was active in another connection.
#
# 32.3) SHOW GRANTS.
create user mysqltest_u1;
Success: Was able to run 'show grants for mysqltest_u1' under FTWRL.
Success: Was able to run 'show grants for mysqltest_u1' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show grants for mysqltest_u1' was active in another connection.
drop user mysqltest_u1;
#
# 32.4) SHOW CREATE TABLE.
Success: Was able to run 'show create table t1_base' under FTWRL.
Success: Was able to run 'show create table t1_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show create table t1_base' was active in another connection.
#
# 32.5) SHOW CREATE FUNCTION.
Success: Was able to run 'show create function f1' under FTWRL.
Success: Was able to run 'show create function f1' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'show create function f1' was active in another connection.
#
# 33) SIGNAL statement is compatible with FTWRL.
#
# Note that we don't cover RESIGNAL as it requires
# active handler context. 
Success: Was able to run 'signal sqlstate '01000'' under FTWRL.
Success: Was able to run 'signal sqlstate '01000'' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'signal sqlstate '01000'' was active in another connection.
#
# 34) TRUNCATE TABLE statement.
# 
# 34.a) TRUNCATE of base table is incompatible with FTWRL.
Success: Was not able to run 'truncate table t1_base' under FTWRL.
Success: 'truncate table t1_base' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'truncate table t1_base' is active in another connection.
# 
# 34.b) TRUNCATE of temporary table is compatible with FTWRL.
Success: Was able to run 'truncate table t1_temp' under FTWRL.
Success: Was able to run 'truncate table t1_temp' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'truncate table t1_temp' was active in another connection.
#
# 35) UPDATE variants.
#
# 35.1) Simple UPDATE.
# 
# 35.1.a) Simple UPDATE on base table is incompatible with FTWRL.
Success: Was not able to run 'update t1_base set i= 1 where i = 0' under FTWRL.
Success: 'update t1_base set i= 1 where i = 0' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'update t1_base set i= 1 where i = 0' is active in another connection.
# 
# 35.1.b) Simple UPDATE on temporary table is compatible with FTWRL.
Success: Was able to run 'update t1_temp set i= 1 where i = 0' under FTWRL.
Success: Was able to run 'update t1_temp set i= 1 where i = 0' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'update t1_temp set i= 1 where i = 0' was active in another connection.
#
# 35.2) Multi UPDATE.
# 
# 35.2.a) Multi UPDATE on base tables is incompatible with FTWRL.
Success: Was not able to run 'update t1_base, t2_base set t1_base.i= 1 where t1_base.i = t2_base.j' under FTWRL.
Success: 'update t1_base, t2_base set t1_base.i= 1 where t1_base.i = t2_base.j' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'update t1_base, t2_base set t1_base.i= 1 where t1_base.i = t2_base.j' is active in another connection.
# 
# 35.2.b) Multi UPDATE on temporary tables is compatible with FTWRL.
Success: Was able to run 'update t1_temp, t2_temp set t1_temp.i= 1 where t1_temp.i = t2_temp.j' under FTWRL.
Success: Was able to run 'update t1_temp, t2_temp set t1_temp.i= 1 where t1_temp.i = t2_temp.j' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'update t1_temp, t2_temp set t1_temp.i= 1 where t1_temp.i = t2_temp.j' was active in another connection.
#
# 36) USE statement is compatible with FTWRL.
#
Success: Was able to run 'use mysqltest1' under FTWRL.
Success: Was able to run 'use mysqltest1' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'use mysqltest1' was active in another connection.
#
# 37) XA statements.
#     
# XA statements are similar to BEGIN/COMMIT/ROLLBACK.
#
# XA BEGIN, END, PREPARE, ROLLBACK and RECOVER are compatible
# with FTWRL. XA COMMIT is not.
flush tables with read lock;
# Although all below statements are allowed under FTWRL they
# are almost no-ops as FTWRL does commit and does not allows
# any non-temporary DML under it.
xa start 'test1';
xa end 'test1';
xa prepare 'test1';
xa rollback 'test1';
xa start 'test1';
xa end 'test1';
xa prepare 'test1';
xa commit 'test1';
xa recover;
unlock tables;
# Check that XA non-COMMIT statements are not and COMMIT is
# blocked by active FTWRL in another connection
#
connection con1;
flush tables with read lock;
connection default;
xa start 'test1';
connection con1;
unlock tables;
connection default;
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
xa end 'test1';
xa prepare 'test1';
xa rollback 'test1';
connection con1;
unlock tables;
connection default;
xa start 'test1';
insert into t3_trans values (1);
connection con1;
flush tables with read lock;
connection default;
connection default;
xa end 'test1';
xa prepare 'test1';
# Send:
xa commit 'test1';;
connection con1;
# Wait until XA COMMIT is blocked.
unlock tables;
connection default;
# Reap XA COMMIT.
delete from t3_trans;
#
# Check that XA COMMIT blocks FTWRL in another connection.
xa start 'test1';
insert into t3_trans values (1);
xa end 'test1';
xa prepare 'test1';
set debug_sync='RESET';
set debug_sync='trans_xa_commit_after_acquire_commit_lock SIGNAL parked WAIT_FOR go';
xa commit 'test1';
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
connection con2;
# Wait until FTWRL is blocked.
set debug_sync='now SIGNAL go';
connection default;
# Reap XA COMMIT.
connection con1;
# Reap FTWRL.
unlock tables;
connection default;
delete from t3_trans;
set debug_sync= "RESET";
#
# 38) Test effect of auto-commit mode for DML on transactional
#     temporary tables.
# 
# 38.1) When auto-commit is on each such a statement ends with commit
#       of changes to temporary tables. But since transactions doing
#       such changes are considered read only [sic!/QQ] this commit
#       is compatible with FTWRL.
#
#       Let us demostrate this fact for some common DML statements.
Success: Was able to run 'delete from t3_temp_trans' under FTWRL.
Success: Was able to run 'delete from t3_temp_trans' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'delete from t3_temp_trans' was active in another connection.
Success: Was able to run 'insert into t3_temp_trans values (1)' under FTWRL.
Success: Was able to run 'insert into t3_temp_trans values (1)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'insert into t3_temp_trans values (1)' was active in another connection.
Success: Was able to run 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' under FTWRL.
Success: Was able to run 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' was active in another connection.
# 
# 38.2) When auto-commit is off DML on transaction temporary tables
#       is compatible with FTWRL.
#
set autocommit= 0;
Success: Was able to run 'delete from t3_temp_trans' under FTWRL.
Success: Was able to run 'delete from t3_temp_trans' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'delete from t3_temp_trans' was active in another connection.
Success: Was able to run 'insert into t3_temp_trans values (1)' under FTWRL.
Success: Was able to run 'insert into t3_temp_trans values (1)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'insert into t3_temp_trans values (1)' was active in another connection.
Success: Was able to run 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' under FTWRL.
Success: Was able to run 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'update t3_temp_trans, t2_temp set t3_temp_trans.i= 1 where t3_temp_trans.i = t2_temp.j' was active in another connection.
set autocommit= 1;
#
# 39) Test effect of DDL on transactional tables.
#
# 39.1) Due to implicit commit at the end of statement some of DDL
#       statements which are compatible with FTWRL in non-transactional
#       case are not compatible in case of transactional tables.
#
# 39.1.a) ANALYZE TABLE for transactional table is incompatible with
#         FTWRL.
flush tables with read lock;
analyze table t3_trans;
ERROR HY000: Can't execute the query because you have a conflicting read lock
unlock tables;
#
connection con1;
flush tables with read lock;
connection default;
analyze table t3_trans;
connection con1;
# Check that ANALYZE TABLE is blocked.
unlock tables;
connection default;
# Reap ANALYZE TABLE
Table	Op	Msg_type	Msg_text
test.t3_trans	analyze	status	Engine-independent statistics collected
test.t3_trans	analyze	status	OK
#
# 39.1.b) CHECK TABLE for transactional table is compatible with FTWRL.
#         Although it does implicit commit at the end of statement it
#         is considered to be read-only operation.
# Skip last part of compatibility testing as this statement
# releases metadata locks in non-standard place.
Success: Was able to run 'check table t3_trans' under FTWRL.
Success: Was able to run 'check table t3_trans' with FTWRL active in another connection.
#
# 39.2) Situation with DDL on temporary transactional tables is
#       complex.
#
# 39.2.a) Some statements compatible with FTWRL since they don't
#         do implicit commit.
#
# For example, CREATE TEMPORARY TABLE:
Success: Was able to run 'create temporary table t4_temp_trans(i int) engine=innodb' under FTWRL.
Success: Was able to run 'create temporary table t4_temp_trans(i int) engine=innodb' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'create temporary table t4_temp_trans(i int) engine=innodb' was active in another connection.
#
# Or DROP TEMPORARY TABLE:
Success: Was able to run 'drop temporary tables t3_temp_trans' under FTWRL.
Success: Was able to run 'drop temporary tables t3_temp_trans' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'drop temporary tables t3_temp_trans' was active in another connection.
#
# 39.2.b) Some statements do implicit commit but are considered
#         read-only and so are compatible with FTWRL.
#
# For example, REPAIR TABLE:
Success: Was able to run 'repair table t3_temp_trans' under FTWRL.
Success: Was able to run 'repair table t3_temp_trans' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'repair table t3_temp_trans' was active in another connection.
#
# And ANALYZE TABLE:
Error: Wasn't able to run 'analyze table t3_temp_trans' under FTWRL!
Success: Was able to run 'analyze table t3_temp_trans' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'analyze table t3_temp_trans' was active in another connection.
#
# And ALTER TABLE:
Success: Was able to run 'alter table t3_temp_trans add column c1 int' under FTWRL.
Success: Was able to run 'alter table t3_temp_trans add column c1 int' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'alter table t3_temp_trans add column c1 int' was active in another connection.
#
# 40) Test effect of implicit commit for DDL which is otherwise
#     compatible with FTWRL. Implicit commit at the start of DDL
#     statement can make it incompatible with FTWRL if there are
#     some changes to be commited even in case when DDL statement
#     itself is compatible with FTWRL.
#
# For example CHECK TABLE for base non-transactional tables and
# ALTER TABLE for temporary non-transactional tables are affected.
begin;
insert into t3_trans values (1);
#
connection con1;
flush tables with read lock;
connection default;
check table t1_base;
connection con1;
# Check that CHECK TABLE is blocked.
unlock tables;
connection default;
# Reap CHECK TABLE
Table	Op	Msg_type	Msg_text
test.t1_base	check	status	OK
begin;
delete from t3_trans;
#
connection con1;
flush tables with read lock;
connection default;
alter table t1_temp add column c1 int;
connection con1;
# Check that ALTER TABLE is blocked.
unlock tables;
connection default;
# Reap ALTER TABLE
alter table t1_temp drop column c1;
#
# Check that FLUSH TABLES WITH READ LOCK is blocked by individual
# statements and is not blocked in the presence of transaction which
# has done some changes earlier but is idle now (or does only reads).
# This allows to use this statement even on systems which has long
# running transactions.
#
begin;
insert into t1_base values (1);
insert into t3_trans values (1);
connection con1;
# The below FTWRL should not be blocked by transaction in 'default'.
flush tables with read lock;
connection default;
# Transaction still is able to read even with FTWRL active in another
# connection.
select * from t1_base;
i
1
select * from t2_base;
j
select * from t3_trans;
i
1
connection con1;
unlock tables;
connection default;
commit;
delete from t1_base;
delete from t3_trans;
#
# Check that impending FTWRL blocks new DML statements and
# so can't be starved by a constant flow of DML.
# (a.k.a. test for bug #54673 "It takes too long to get
# readlock for 'FLUSH TABLES WITH READ LOCK'").
#
set debug_sync='RESET';
set debug_sync='execute_command_after_close_tables SIGNAL parked WAIT_FOR go';
insert into t1_base values (1);
connection con1;
set debug_sync='now WAIT_FOR parked';
flush tables with read lock;
connection con2;
# Wait until FTWRL is blocked.
# Try to run another INSERT and see that it is blocked.
insert into t2_base values (1);;
connection con3;
# Wait until new INSERT is blocked.
# Unblock INSERT in the first connection.
set debug_sync='now SIGNAL go';
connection default;
# Reap first INSERT.
connection con1;
# Reap FTWRL.
unlock tables;
connection con2;
# Reap second INSERT.
connection default;
set debug_sync= "RESET";
delete from t1_base;
delete from t2_base;

# Check that COMMIT thas is issued after
# FLUSH TABLES WITH READ LOCK is not blocked by
# FLUSH TABLES WITH READ LOCK from another connection.
# This scenario is used in innobackup.pl. The COMMIT goes
# through because the transaction started by FTWRL does
# not modify any tables, and the commit blocker lock is
# only taken when there were such modifications.

flush tables with read lock;
connection con1;
# The below FTWRL should not be blocked by transaction in 'default'.
flush tables with read lock;
connection default;
select * from t1_base;
i
select * from t3_trans;
i
commit;
connection con1;
select * from t1_base;
i
select * from t3_trans;
i
commit;
unlock tables;
connection default;
unlock tables;
#
# Check how FLUSH TABLE WITH READ LOCK is handled for MERGE tables.
# As usual there are tricky cases related to this type of tables.
#
#
# 1) Most typical case - base MERGE table with base underlying tables.
#    
# 1.a) DML statements which change data should be incompatible with FTWRL.
create table tm_base (i int) engine=merge union=(t1_base) insert_method=last;
Success: Was not able to run 'insert into tm_base values (1)' under FTWRL.
Success: 'insert into tm_base values (1)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'insert into tm_base values (1)' is active in another connection.
#
# 1.b) DDL statement on such table should be incompatible with FTWRL as well.
Success: Was not able to run 'alter table tm_base insert_method=first' under FTWRL.
Success: 'alter table tm_base insert_method=first' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter table tm_base insert_method=first' is active in another connection.
drop table tm_base;
#
# 2) Temporary MERGE table with base underlying tables.
#
# 2.a) DML statements which change data should be incompatible with FTWRL
#      as they affect base tables.
create temporary table tm_temp_base (i int) engine=merge union=(t1_base) insert_method=last;
Success: Was not able to run 'insert into tm_temp_base values (1)' under FTWRL.
Success: 'insert into tm_temp_base values (1)' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'insert into tm_temp_base values (1)' is active in another connection.
#
# 2.b) Some of DDL statements on such table can be compatible with FTWRL
#      as they don't affect base tables.
Success: Was able to run 'drop temporary tables tm_temp_base' under FTWRL.
Success: Was able to run 'drop temporary tables tm_temp_base' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'drop temporary tables tm_temp_base' was active in another connection.
#
# 2.c) ALTER statement is incompatible with FTWRL. Even though it does
#      not change data in base table it still acquires strong metadata
#      locks on them.
Success: Was not able to run 'alter table tm_temp_base insert_method=first' under FTWRL.
Success: 'alter table tm_temp_base insert_method=first' is blocked by FTWRL active in another connection.
Success: FTWRL is blocked when 'alter table tm_temp_base insert_method=first' is active in another connection.
drop table tm_temp_base;
#
# 3) Temporary MERGE table with temporary underlying tables.
#
# 3.a) DML statements should be compatible with FTWRL as
#      no base table is going to be affected.
create temporary table tm_temp_temp (i int) engine=merge union=(t1_temp) insert_method=last;
Success: Was able to run 'insert into tm_temp_temp values (1)' under FTWRL.
Success: Was able to run 'insert into tm_temp_temp values (1)' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'insert into tm_temp_temp values (1)' was active in another connection.
#
# 3.b) DDL statements should be compatible with FTWRL as well
#      as no base table is going to be affected too.
Success: Was able to run 'alter table tm_temp_temp union=(t1_temp) insert_method=first' under FTWRL.
Success: Was able to run 'alter table tm_temp_temp union=(t1_temp) insert_method=first' with FTWRL active in another connection.
Success: Was able to run FTWRL while 'alter table tm_temp_temp union=(t1_temp) insert_method=first' was active in another connection.
drop table tm_temp_temp;
#
# 4) For the sake of completeness let us check that base MERGE tables
#    with temporary underlying tables are not functional.
create table tm_base_temp (i int) engine=merge union=(t1_temp) insert_method=last;
select * from tm_base_temp;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
drop table tm_base_temp;
#
# Clean-up.
#
drop event e1;
drop function f2_temp;
drop function f2_base;
drop procedure p2;
drop view v1;
drop function f1;
drop procedure p1;
drop database `#mysql50#mysqltest-2`;
drop database mysqltest1;
drop temporary tables t1_temp, t2_temp;
drop tables t1_base, t2_base, t3_trans;
disconnect con1;
disconnect con2;
disconnect con3;
set global sql_mode=default;
#
# Deadlock between FTWRL under open handler and DDL/LOCK TABLES
#
CREATE TABLE t1(a INT);
#
connect  con3,localhost,root,,;
HANDLER t1 OPEN;
#
connect  con1,localhost,root,,;
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL ready';
LOCK TABLE t1 WRITE;
#
# we need to do it in a separate connection,
# because SET DEBUG_SYNC call open_tables()/mysql_ha_flush() :(
connect  con2,localhost,root,,;
SET DEBUG_SYNC= 'now WAIT_FOR ready';
disconnect con2;
#
connection default;
FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES;
#
connection con3;
HANDLER t1 CLOSE;
disconnect con3;
#
connection con1;
UNLOCK TABLES;
disconnect con1;
#
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
#
# Make sure pending LOCK TABLES doesn't block FTWRL
#
CREATE TABLE t1(a INT);
LOCK TABLE t1 READ;
#
connect  con1,localhost,root,,;
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL ready';
LOCK TABLE t1 WRITE;
#
connect  con2,localhost,root,,;
SET DEBUG_SYNC= 'now WAIT_FOR ready';
FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES;
disconnect con2;
#
connection default;
UNLOCK TABLES;
#
connection con1;
UNLOCK TABLES;
disconnect con1;
#
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
#
# MDEV-19384 Deadlock between FTWRL under open HANDLER, LOCK TABLE
# and DROP DATABASE
#
SET DEBUG_SYNC= 'ftwrl_before_lock SIGNAL ready WAIT_FOR go';
CREATE DATABASE mysqltest;
CREATE TABLE mysqltest.t1(a INT);
HANDLER mysqltest.t1 OPEN as t1;
connect  con1,localhost,root,,;
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL ready1';
LOCK TABLE mysqltest.t1 WRITE;
connect  con2,localhost,root,,;
SET DEBUG_SYNC= 'now WAIT_FOR ready1';
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL ready2';
DROP DATABASE mysqltest;
connect  con3,localhost,root,,;
SET DEBUG_SYNC= 'now WAIT_FOR ready2';
connection default;
FLUSH TABLES WITH READ LOCK;
connection con3;
SET DEBUG_SYNC= 'now WAIT_FOR ready';
disconnect con3;
connection con1;
SET DEBUG_SYNC= 'now SIGNAL go';
disconnect con1;
connection default;
UNLOCK TABLES;
HANDLER t1 CLOSE;
connection con2;
disconnect con2;
connection default;
SET DEBUG_SYNC= 'RESET';