path: root/mysql-test/main/lock_sync.test

#
# Locking related tests which use DEBUG_SYNC facility.
#
--source include/have_debug_sync.inc
# We need InnoDB to be able use TL_WRITE_ALLOW_WRITE type of locks in our tests.
--source include/have_innodb.inc
# This test requires statement/mixed mode binary logging.
# Row-based mode puts weaker serializability requirements
# so weaker locks are acquired for it.
--source include/have_binlog_format_mixed_or_statement.inc
# Until bug#41971 'Thread state on embedded server is always "Writing to net"'
# is fixed this test can't be run on embedded version of server.
--source include/not_embedded.inc

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


--echo #
--echo # Test how we handle locking in various cases when
--echo # we read data from MyISAM tables.
--echo #
--echo # In this test we mostly check that the SQL-layer correctly
--echo # determines the type of thr_lock.c lock for a table being
--echo # read.
--echo # I.e. that it disallows concurrent inserts when the statement
--echo # is going to be written to the binary log and therefore
--echo # should be serialized, and allows concurrent inserts when
--echo # such serialization is not necessary (e.g. when 
--echo # the statement is not written to binary log).
--echo #

--echo # Force concurrent inserts to be performed even if the table
--echo # has gaps. This allows to simplify clean up in scripts
--echo # used below (instead of backing up table being inserted
--echo # into and then restoring it from backup at the end of the
--echo # script we can simply delete rows which were inserted).
set @old_concurrent_insert= @@global.concurrent_insert;
set @@global.concurrent_insert= 2;
select @@global.concurrent_insert;

--echo # Prepare playground by creating tables, views,
--echo # routines and triggers used in tests.
connect (con1, localhost, root,,);
connect (con2, localhost, root,,);
connection default;
--disable_warnings
drop table if exists t0, t1, t2, t3, t4, t5;
drop view if exists v1, v2;
drop procedure if exists p1;
drop procedure if exists p2;
drop procedure if exists p3;
drop function if exists f1;
drop function if exists f2;
drop function if exists f3;
drop function if exists f4;
drop function if exists f5;
drop function if exists f6;
drop function if exists f7;
drop function if exists f8;
drop function if exists f9;
drop function if exists f10;
drop function if exists f11;
drop function if exists f12;
drop function if exists f13;
drop function if exists f14;
drop function if exists f15;
drop function if exists f16;
drop function if exists f17;
--enable_warnings
create table t1 (i int primary key);
insert into t1 values (1), (2), (3), (4), (5);
create table t2 (j int primary key);
insert into t2 values (1), (2), (3), (4), (5);
create table t3 (k int primary key);
insert into t3 values (1), (2), (3);
create table t4 (l int primary key);
insert into t4 values (1);
create table t5 (l int primary key);
insert into t5 values (1);
create view v1 as select i from t1;
create view v2 as select j from t2 where j in (select i from t1);
create procedure p1(k int) insert into t2 values (k);
delimiter |;
--enable_prepare_warnings
create function f1() returns int
begin
  declare j int;
  select i from t1 where i = 1 into j;
  return j;
end|
create function f2() returns int
begin
  declare k int;
  select i from t1 where i = 1 into k;
  insert into t2 values (k + 5);
  return 0;
end|
create function f3() returns int
begin
  return (select i from t1 where i = 3);
end|
create function f4() returns int
begin
  if (select i from t1 where i = 3) then
    return 1;
  else
    return 0;
  end if;
end|
create function f5() returns int
begin
  insert into t2 values ((select i from t1 where i = 1) + 5);
  return 0;
end|
create function f6() returns int
begin
  declare k int;
  select i from v1 where i = 1 into k;
  return k;
end|
create function f7() returns int
begin
  declare k int;
  select j from v2 where j = 1 into k;
  return k;
end|
create function f8() returns int
begin
  declare k int;
  select i from v1 where i = 1 into k;
  insert into t2 values (k+5);
  return k;
end|
create function f9() returns int
begin
  update v2 set j=j+10 where j=1;
  return 1;
end|
create function f10() returns int
begin
  return f1();
end|
create function f11() returns int
begin
  declare k int;
  set k= f1();
  insert into t2 values (k+5);
  return k;
end|
create function f12(p int) returns int
begin
  insert into t2 values (p);
  return p;
end|
create function f13(p int) returns int
begin
  return p;
end|
create procedure p2(inout p int)
begin
  select i from t1 where i = 1 into p;
end|
create function f14() returns int
begin
  declare k int;
  call p2(k);
  insert into t2 values (k+5);
  return k;
end|
create function f15() returns int
begin
  declare k int;
  call p2(k);
  return k;
end|
create function f16() returns int
begin
  create temporary table if not exists temp1 (a int);
  insert into temp1 select * from t1;
  drop temporary table temp1;
  return 1;
end|
create function f17() returns int
begin
  declare j int;
  select i from t1 where i = 1 into j;
  call p3;
  return 1;
end|
create procedure p3()
begin
  create temporary table if not exists temp1 (a int);
  insert into temp1 select * from t1;
  drop temporary table temp1;
end|
create trigger t4_bi before insert on t4 for each row
begin
  declare k int;
  select i from t1 where i=1 into k;
  set new.l= k+1;
end|
create trigger t4_bu before update on t4 for each row
begin
  if (select i from t1 where i=1) then
    set new.l= 2;
  end if;
end|
create trigger t4_bd before delete on t4 for each row
begin
  if !(select i from v1 where i=1) then
    signal sqlstate '45000';
  end if;
end|
create trigger t5_bi before insert on t5 for each row
begin
  set new.l= f1()+1;
end|
create trigger t5_bu before update on t5 for each row
begin
  declare j int;
  call p2(j);
  set new.l= j + 1;
end|
delimiter ;|

--disable_prepare_warnings

--echo #
--echo # Set common variables to be used by the scripts
--echo # called below.
--echo #
let $con_aux1= con1; 
let $con_aux2= con2; 
let $table= t1;

connection con1;
set @save_dbug=@@debug_dbug;
set debug_dbug="+d,cache_sp_in_show_create";
--echo # Cache all functions used in the tests below so statements
--echo # calling them won't need to open and lock mysql.proc table
--echo # and we can assume that each statement locks its tables
--echo # once during its execution.
--disable_result_log
show create procedure p1;
show create procedure p2;
show create procedure p3;
show create function f1;
show create function f2;
show create function f3;
show create function f4;
show create function f5;
show create function f6;
show create function f7;
show create function f8;
show create function f9;
show create function f10;
show create function f11;
show create function f12;
show create function f13;
show create function f14;
show create function f15;
show create function f16;
show create function f17;
set debug_dbug=@save_dbug;
--enable_result_log
connection default;

--echo #
--echo # 1. Statements that read tables and do not use subqueries.
--echo #

--echo #
--echo # 1.1 Simple SELECT statement.
--echo #
--echo # No locks are necessary as this statement won't be written
--echo # to the binary log and thanks to how MyISAM works SELECT
--echo # will see version of the table prior to concurrent insert.
let $statement= select * from t1;
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 1.2 Multi-UPDATE statement.
--echo #
--echo # Has to take shared locks on rows in the table being read as this
--echo # statement will be written to the binary log and therefore should
--echo # be serialized with concurrent statements.
let $statement= update t2, t1 set j= j - 1 where i = j;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 1.3 Multi-DELETE statement.
--echo #
--echo # The above is true for this statement as well.
let $statement= delete t2 from t1, t2 where i = j;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 1.4 DESCRIBE statement.
--echo #
--echo # This statement does not really read data from the
--echo # target table and thus does not take any lock on it.
--echo # We check this for completeness of coverage.
lock table t1 write;
connection con1;
--echo # This statement should not be blocked.
--disable_result_log
describe t1;
--enable_result_log
connection default;
unlock tables;

--echo #
--echo # 1.5 SHOW statements.
--echo # 
--echo # The above is true for SHOW statements as well.
lock table t1 write;
connection con1;
--echo # These statements should not be blocked.
# The below test for SHOW CREATE TABLE is disabled until bug 52593
# "SHOW CREATE TABLE is blocked if table is locked for write by another
# connection" is fixed.
--disable_parsing
show create table t1;
--enable_parsing
--disable_result_log
show keys from t1;
--enable_result_log
connection default;
unlock tables;


--echo #
--echo # 2. Statements which read tables through subqueries.
--echo #

--echo #
--echo # 2.1 CALL with a subquery.
--echo # 
--echo # A strong lock is not necessary as this statement is not
--echo # written to the binary log as a whole (it is written
--echo # statement-by-statement).
let $statement= call p1((select i + 5 from t1 where i = 1));
let $restore_table= t2;
--source include/check_concurrent_insert.inc

--echo #
--echo # 2.2 CREATE TABLE with a subquery.
--echo #
--echo # Has to take a strong lock on the table being read as
--echo # this statement is written to the binary log and therefore
--echo # should be serialized with concurrent statements.
let $statement= create table t0 select * from t1;
let $restore_table= ;
--source include/check_no_concurrent_insert.inc
drop table t0;
let $statement= create table t0 select j from t2 where j in (select i from t1);
let $restore_table= ;
--source include/check_no_concurrent_insert.inc
drop table t0;

--echo #
--echo # 2.3 DELETE with a subquery.
--echo #
--echo # The above is true for this statement as well.
let $statement= delete from t2 where j in (select i from t1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 2.4 MULTI-DELETE with a subquery.
--echo #
--echo # Same is true for this statement as well.
let $statement= delete t2 from t3, t2 where k = j and j in (select i from t1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 2.5 DO with a subquery.
--echo #
--echo # A strong lock is not necessary as it is not logged.
let $statement= do (select i from t1 where i = 1);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 2.6 INSERT with a subquery.
--echo #
--echo # Has to take a strong lock on the table being read as
--echo # this statement is written to the binary log and therefore
--echo # should be serialized with concurrent inserts.
let $statement= insert into t2 select i+5 from t1;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= insert into t2 values ((select i+5 from t1 where i = 4));
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 2.7 LOAD DATA with a subquery.
--echo # 
--echo # The above is true for this statement as well.
let $statement= load data infile '../../std_data/rpl_loaddata.dat' into table t2 (@a, @b) set j= @b + (select i from t1 where i = 1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 2.8 REPLACE with a subquery.
--echo # 
--echo # Same is true for this statement as well.

--echo # Suppress warnings for REPLACE ... SELECT
--disable_query_log
call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT");
--enable_query_log

let $statement= replace into t2 select i+5 from t1;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= replace into t2 values ((select i+5 from t1 where i = 4));
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 2.9 SELECT with a subquery.
--echo #
--echo # Strong locks are not necessary as this statement is not written
--echo # to the binary log and thanks to how MyISAM works this statement
--echo # sees a version of the table prior to the concurrent insert.
let $statement= select * from t2 where j in (select i from t1);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 2.10 SET with a subquery.
--echo #
--echo # The same is true for this statement as well.
let $statement= set @a:= (select i from t1 where i = 1);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 2.11 SHOW with a subquery.
--echo # 
--echo # And for this statement too.
let $statement= show tables from test where Tables_in_test = 't2' and (select i from t1 where i = 1);
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= show columns from t2 where (select i from t1 where i = 1);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 2.12 UPDATE with a subquery.
--echo #
--echo # Has to take a strong lock on the table being read as
--echo # this statement is written to the binary log and therefore
--echo # should be serialized with concurrent inserts.
let $statement= update t2 set j= j-10 where j in (select i from t1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 2.13 MULTI-UPDATE with a subquery.
--echo #
--echo # Same is true for this statement as well.
let $statement= update t2, t3 set j= j -10 where j=k and j in (select i from t1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 3. Statements which read tables through a view.
--echo #

--echo #
--echo # 3.1 SELECT statement which uses some table through a view.
--echo #
--echo # Since this statement is not written to the binary log and
--echo # an old version of the table is accessible thanks to how MyISAM
--echo # handles concurrent insert, no locking is necessary.
let $statement= select * from v1;
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= select * from v2;
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= select * from t2 where j in (select i from v1);
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= select * from t3 where k in (select j from v2);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 3.2 Statements which modify a table and use views.
--echo #
--echo # Since such statements are going to be written to the binary
--echo # log they need to be serialized against concurrent statements
--echo # and therefore should take strong locks on the data read.
let $statement= update t2 set j= j-10 where j in (select i from v1);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= update t3 set k= k-10 where k in (select j from v2);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= update t2, v1 set j= j-10 where j = i;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= update v2 set j= j-10 where j = 3;
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 4. Statements which read tables through stored functions.
--echo #

--echo #
--echo # 4.1 SELECT/SET with a stored function which does not 
--echo #     modify data and uses SELECT in its turn.
--echo #
--echo # There is no need to take strong locks on the table
--echo # being selected from in SF as the call to such function
--echo # won't get into the binary log.
let $statement= select f1();
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= set @a:= f1();
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 4.2 INSERT (or other statement which modifies data) with
--echo #     a stored function which does not modify data and uses
--echo #     SELECT.
--echo #
--echo # Since such statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting the data
--echo # it uses. Therefore it should take strong lock on the data
--echo # it reads.
let $statement= insert into t2 values (f1() + 5);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.3 SELECT/SET with a stored function which
--echo #     reads and modifies data.
--echo #
--echo # Since a call to such function is written to the binary log,
--echo # it should be serialized with concurrent statements affecting
--echo # the data it uses. Hence, a strong lock on the data read
--echo # should be taken.
let $statement= select f2();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= set @a:= f2();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.4. SELECT/SET with a stored function which does not
--echo #      modify data and reads a table through subselect
--echo #      in a control construct.
--echo #
--echo # Call to this function won't get to the
--echo # binary log and thus no strong lock is needed.
let $statement= select f3();
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= set @a:= f3();
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= select f4();
let $restore_table= ;
--source include/check_concurrent_insert.inc
let $statement= set @a:= f4();
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 4.5. INSERT (or other statement which modifies data) with
--echo #      a stored function which does not modify data and reads
--echo #      the table through a subselect in one of its control
--echo #      constructs.
--echo #
--echo # Since such statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting data it
--echo # uses. Therefore it should take a strong lock on the data
--echo # it reads.
let $statement= insert into t2 values (f3() + 5);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= insert into t2 values (f4() + 6);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.6 SELECT/SET which uses a stored function with
--echo #      DML which reads a table via a subquery.
--echo #
--echo # Since call to such function is written to the binary log
--echo # it should be serialized with concurrent statements.
--echo # Hence reads should take a strong lock.
let $statement= select f5();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= set @a:= f5();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.7 SELECT/SET which uses a stored function which
--echo #     doesn't modify data and reads tables through
--echo #     a view.
--echo #
--echo # Calls to such functions won't get into
--echo # the binary log and thus don't need strong
--echo # locks.
let $statement= select f6();
let $restore_table= t2;
--source include/check_concurrent_insert.inc
let $statement= set @a:= f6();
let $restore_table= t2;
--source include/check_concurrent_insert.inc
let $statement= select f7();
let $restore_table= t2;
--source include/check_concurrent_insert.inc
let $statement= set @a:= f7();
let $restore_table= t2;
--source include/check_concurrent_insert.inc

--echo #
--echo # 4.8 INSERT which uses stored function which
--echo #     doesn't modify data and reads a table
--echo #     through a view.
--echo #
--echo # Since such statement is written to the binary log and
--echo # should be serialized with concurrent statements affecting
--echo # the data it uses. Therefore it should take a strong lock on
--echo # the table it reads.
let $statement= insert into t3 values (f6() + 5);
let $restore_table= t3;
--source include/check_no_concurrent_insert.inc
let $statement= insert into t3 values (f7() + 5);
let $restore_table= t3;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 4.9 SELECT which uses a stored function which
--echo #     modifies data and reads tables through a view.
--echo #
--echo # Since a call to such function is written to the binary log
--echo # it should be serialized with concurrent statements.
--echo # Hence, reads should take strong locks.
let $statement= select f8();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc
let $statement= select f9();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.10 SELECT which uses a stored function which doesn't modify
--echo #      data and reads a table indirectly, by calling another
--echo #      function.
--echo #
--echo # Calls to such functions won't get into the binary
--echo # log and thus don't need to acquire strong locks.
let $statement= select f10();
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 4.11 INSERT which uses a stored function which doesn't modify
--echo #      data and reads a table indirectly, by calling another
--echo #      function. 
--echo #
--echo # Since such statement is written to the binary log, it should
--echo # be serialized with concurrent statements affecting the data it
--echo # uses. Therefore it should take strong locks on data it reads.
let $statement= insert into t2 values (f10() + 5);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.12 SELECT which uses a stored function which modifies
--echo #      data and reads a table indirectly, by calling another
--echo #      function. 
--echo #
--echo # Since a call to such function is written to the binary log
--echo # it should be serialized from concurrent statements.
--echo # Hence, read should take a strong lock.
let $statement= select f11();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.13 SELECT that reads a table through a subquery passed
--echo #      as a parameter to a stored function which modifies
--echo #      data.
--echo #
--echo # Even though a call to this function is written to the
--echo # binary log, values of its parameters are written as literals.
--echo # So there is no need to acquire strong locks for tables used in
--echo # the subquery.
let $statement= select f12((select i+10 from t1 where i=1));
let $restore_table= t2;
--source include/check_concurrent_insert.inc

--echo #
--echo # 4.14 INSERT that reads a table via a subquery passed
--echo #      as a parameter to a stored function which doesn't
--echo #      modify data.
--echo #
--echo # Since this statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting the data it
--echo # uses. Therefore it should take strong locks on the data it reads.
let $statement= insert into t2 values (f13((select i+10 from t1 where i=1)));
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.15 SELECT/SET with a stored function which 
--echo #      inserts data into a temporary table using
--echo #      SELECT on t1.
--echo #
--echo # Since this statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting the data it
--echo # uses. Therefore it should take strong locks on the data it reads.
let $statement= select f16();
let $restore_table= ;
--source include/check_no_concurrent_insert.inc
let $statement= set @a:= f16();
let $restore_table= ;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 4.16 SELECT/SET with a stored function which call procedure
--echo #      which inserts data into a temporary table using
--echo #      SELECT on t1.
--echo #
--echo # Since this statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting the data it
--echo # uses. Therefore it should take strong locks on the data it reads.
let $statement= select f17();
let $restore_table= ;
--source include/check_no_concurrent_insert.inc
let $statement= set @a:= f17();
let $restore_table= ;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 5. Statements that read tables through stored procedures.
--echo #

--echo #
--echo # 5.1 CALL statement which reads a table via SELECT.
--echo #
--echo # Since neither this statement nor its components are
--echo # written to the binary log, there is no need to take
--echo # strong locks on the data it reads.
let $statement= call p2(@a);
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 5.2 Function that modifies data and uses CALL, 
--echo #     which reads a table through SELECT.
--echo #
--echo # Since a call to such function is written to the binary
--echo # log, it should be serialized with concurrent statements.
--echo # Hence, in this case reads should take strong locks on data.
let $statement= select f14();
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 5.3 SELECT that calls a function that doesn't modify data and
--echo #     uses a CALL statement that reads a table via SELECT.
--echo #
--echo # Calls to such functions won't get into the binary
--echo # log and thus don't need to acquire strong locks.
let $statement= select f15();
let $restore_table= ;
--source include/check_concurrent_insert.inc

--echo #
--echo # 5.4 INSERT which calls function which doesn't modify data and
--echo #     uses CALL statement which reads table through SELECT.
--echo #
--echo # Since such statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting data it
--echo # uses. Therefore it should take strong locks on data it reads.
let $statement= insert into t2 values (f15()+5);
let $restore_table= t2;
--source include/check_no_concurrent_insert.inc


--echo #
--echo # 6. Statements that use triggers.
--echo #

--echo #
--echo # 6.1 Statement invoking a trigger that reads table via SELECT.
--echo #
--echo # Since this statement is written to the binary log it should
--echo # be serialized with concurrent statements affecting the data
--echo # it uses. Therefore, it should take strong locks on the data
--echo # it reads.
let $statement= insert into t4 values (2);
let $restore_table= t4;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 6.2 Statement invoking a trigger that reads table through
--echo #     a subquery in a control construct.
--echo #
--echo # The above is true for this statement as well.
let $statement= update t4 set l= 2 where l = 1;
let $restore_table= t4;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 6.3 Statement invoking a trigger that reads a table through
--echo #     a view.
--echo #
--echo # And for this statement.
let $statement= delete from t4 where l = 1;
let $restore_table= t4;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 6.4 Statement invoking a trigger that reads a table through
--echo #     a stored function.
--echo #
--echo # And for this statement.
let $statement= insert into t5 values (2);
let $restore_table= t5;
--source include/check_no_concurrent_insert.inc

--echo #
--echo # 6.5 Statement invoking a trigger that reads a table through
--echo #     stored procedure.
--echo #
--echo # And for this statement.
let $statement= update t5 set l= 2 where l = 1;
let $restore_table= t5;
--source include/check_no_concurrent_insert.inc

--echo # Clean-up.
drop function f1;
drop function f2;
drop function f3;
drop function f4;
drop function f5;
drop function f6;
drop function f7;
drop function f8;
drop function f9;
drop function f10;
drop function f11;
drop function f12;
drop function f13;
drop function f14;
drop function f15;
drop function f16;
drop function f17;
drop view v1, v2;
drop procedure p1;
drop procedure p2;
drop procedure p3;
drop table t1, t2, t3, t4, t5;

disconnect con1;
disconnect con2;

set @@global.concurrent_insert= @old_concurrent_insert;


--echo #
--echo # Bug#50821 Deadlock between LOCK TABLES and ALTER TABLE
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1, t2;
--enable_warnings

CREATE TABLE t1(id INT);
CREATE TABLE t2(id INT);

connect (con2, localhost, root);
START TRANSACTION;
SELECT * FROM t1;

connection default;
--echo # Sending:
--send ALTER TABLE t1 ADD COLUMN j INT

connection con2;
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE state = "Waiting for table metadata lock" 
  AND info = "ALTER TABLE t1 ADD COLUMN j INT";
--source include/wait_condition.inc

--echo # This used to cause a deadlock.
INSERT INTO t2 SELECT * FROM t1;

COMMIT;

connection default;
--echo # Reaping ALTER TABLE t1 ADD COLUMN j INT
--reap

DROP TABLE t1, t2;
disconnect con2;


--echo #
--echo # Bug#51391 Deadlock involving events during rqg_info_schema test
--echo #

CREATE EVENT e1 ON SCHEDULE EVERY 5 HOUR DO SELECT 1;
CREATE EVENT e2 ON SCHEDULE EVERY 5 HOUR DO SELECT 2;

connect(con1, localhost, root);
SET DEBUG_SYNC="before_lock_tables_takes_lock SIGNAL drop WAIT_FOR query";
--echo # Sending:
--send DROP EVENT e1;

connection default;
SET DEBUG_SYNC="now WAIT_FOR drop";
SELECT name FROM mysql.event, INFORMATION_SCHEMA.GLOBAL_VARIABLES
  WHERE definer = VARIABLE_VALUE;
SET DEBUG_SYNC="now SIGNAL query";

connection con1;
--echo # Reaping: DROP EVENT t1
--reap
disconnect con1;
--source include/wait_until_disconnected.inc

connection default;
DROP EVENT e2;
SET DEBUG_SYNC="RESET";


--echo #
--echo # Bug#57130 crash in Item_field::print during SHOW CREATE TABLE or VIEW
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
DROP VIEW IF EXISTS v1;
DROP FUNCTION IF EXISTS f1;
--enable_warnings

CREATE TABLE t1(a INT);
CREATE FUNCTION f1() RETURNS INTEGER RETURN 1;
CREATE VIEW v1 AS SELECT * FROM t1 WHERE f1() = 1;
DROP FUNCTION f1;
connect(con2, localhost, root);

connect (con1, localhost, root);
# Need to trigger this sync point at least twice in order to
# get valgrind test failures without the patch
SET DEBUG_SYNC= 'open_tables_after_open_and_process_table SIGNAL opened WAIT_FOR dropped EXECUTE 2';
--echo # Sending:
--send SHOW CREATE VIEW v1

connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR opened';
SET DEBUG_SYNC= 'now SIGNAL dropped';
SET DEBUG_SYNC= 'now WAIT_FOR opened';
--echo # Sending:
--send FLUSH TABLES t1

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 t1';
--source include/wait_condition.inc
SET DEBUG_SYNC= 'now SIGNAL dropped';

connection con1;
--echo # Reaping: SHOW CREATE VIEW v1
--reap

connection con2;
--echo # Reaping: FLUSH TABLES
--reap

connection default;
SET DEBUG_SYNC= 'RESET';
DROP VIEW v1;
DROP TABLE t1;
disconnect con1;
disconnect con2;


--echo #
--echo # Bug#28587 SELECT is blocked by INSERT waiting on read lock, even with low_priority_updates
--echo #
set low_priority_updates=1;
--disable_warnings
drop table if exists t1;
drop table if exists t2;
--enable_warnings
set debug_sync='RESET';
create table t1 (a int, b int, unique key t1$a (a));
create table t2 (j int, k int);
set debug_sync='after_lock_tables_takes_lock SIGNAL parked WAIT_FOR go';
--echo # Sending:
--send insert into t2 select * from t1;
connect (update,localhost,root,,);
connection update;
set debug_sync='now WAIT_FOR parked';
set low_priority_updates=1;
show variables like 'low_priority_updates';
let $ID= `select connection_id()`;
--send insert into t1 values (1, 2) ON DUPLICATE KEY UPDATE b = 2;
connect (select,localhost,root,,);
# we must wait till the insert opens and locks the table
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and id = $ID;
--source include/wait_condition.inc
select * from t1;
set debug_sync='now SIGNAL go';
connection default;
disconnect update;
disconnect select;
--echo # Reaping INSERT SELECT
--reap
drop tables t1, t2;
set low_priority_updates=default;
set debug_sync='RESET';


--echo #
--echo # Additional test coverage for LOCK TABLES ... READ LOCAL
--echo # for InnoDB tables.
--echo #
--echo # Check that we correctly handle deadlocks which can occur
--echo # during metadata lock upgrade which happens when one tries
--echo # to use LOCK TABLES ... READ LOCAL for InnoDB tables.

--enable_connect_log
CREATE TABLE t1 (i INT) ENGINE=InnoDB;
CREATE TABLE t2 (j INT) ENGINE=InnoDB;

--echo # Execute LOCK TABLE READ LOCK which will pause after acquiring
--echo # SR metadata lock and before upgrading it to SRO lock.
SET DEBUG_SYNC="after_open_table_mdl_shared SIGNAL locked WAIT_FOR go";
--echo # Sending:
--send LOCK TABLE t1 READ LOCAL

connect (con1, localhost, root);
SET DEBUG_SYNC="now WAIT_FOR locked";
--echo # Execute RENAME TABLE which will try to acquire X lock.
--echo # Sending:
--send RENAME TABLE t1 TO t3, t2 TO t1, t3 TO t2

connect (con2, localhost, root);
--echo # Wait until RENAME TABLE is blocked.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "RENAME TABLE t1 TO t3, t2 TO t1, t3 TO t2";
--source include/wait_condition.inc
--echo # Resume LOCK TABLE statement. It should try to
--echo # upgrade SR lock to SRO lock which will create
--echo # deadlock due to presence of pending X lock.
--echo # Deadlock should be detected and LOCK TABLES should
--echo # release its MDL and retry opening of tables.
SET DEBUG_SYNC="now SIGNAL go";

connection con1;
--echo # RENAME TABLE should be able to complete. Reap it.
--reap

connection default;
--echo # Reap LOCK TABLES.
--reap
--echo # Check that we see new version of table.
SELECT * FROM t1;
UNLOCK TABLES;

--echo # Clean-up.
SET DEBUG_SYNC="RESET";
disconnect con1;
disconnect con2;
DROP TABLES t1, t2;
--disable_connect_log

# Check that all connections opened by test cases in this file are really
# gone so execution of other tests won't be affected by their presence.
--source include/wait_until_count_sessions.inc

--echo #
--echo # MDEV-28567 Assertion `0' in open_tables upon function-related operation
--echo #
# To get MDL trace run this case like this:
# mtr --mysqld=--debug=d,mdl,query:i:o,/tmp/mdl.log ...
# Cleanup trace like this:
# sed -i -re '/(mysql|performance_schema|sys|mtr)\// d; /MDL_BACKUP_|MDL_INTENTION_/ d; /\/(t2|tr1|tr2)/ d' /tmp/mdl.log

CREATE TABLE t1 (a INT);
CREATE TABLE t2 (b INT);
CREATE TRIGGER tr1 BEFORE INSERT ON t1 FOR EACH ROW UPDATE t2 SET b = 0;
CREATE TRIGGER tr2 BEFORE INSERT ON t2 FOR EACH ROW UPDATE t1 SET a = 6;
CREATE VIEW v1 AS SELECT * FROM t1;

SET AUTOCOMMIT=OFF;
SELECT * FROM t1;
# T@6
# Seized:   test/t1 (MDL_SHARED_READ)

--connect (con1,localhost,root,,test)
--send
  DROP TRIGGER tr1;
# T@7
# Seized:   test/t1 (MDL_SHARED_NO_WRITE)
# Waiting: test/t1 (MDL_EXCLUSIVE)
# Waiting: test/t1 (MDL_SHARED_WRITE)
# Deadlock: test/t1 (MDL_SHARED_WRITE)

--connection default
--error 0, ER_LOCK_DEADLOCK
INSERT INTO t2 SELECT * FROM t2;
# T@6
# Released: test/t1 (MDL_SHARED_READ)
# T@7
# Acquired: test/t1 (MDL_EXCLUSIVE) (good)
--error ER_SP_DOES_NOT_EXIST
SELECT f() FROM t2;
# T@6
# Seized:   test/f (MDL_SHARED)
# T@7
# Released: test/t1 (MDL_EXCLUSIVE)
# Good1: continue T@6 below
# Bad1: continue T@8 below

# Now we hold test/f, the below code creates concurrent
# waiting of 3 threads for test/f which leads to deadlock (Bad)

# To achive Good comment out 'now wait_for s1' below and run multiple times.

--connect (con2,localhost,root,,test)
set debug_sync= 'after_open_table_mdl_shared signal s1';
--send
  ALTER VIEW v1 AS SELECT f() FROM t1;
# T@8
# Good2: Waiting: test/v1 (MDL_EXCLUSIVE)
# Good2-3: continue T@7 below
# Good5: Acquired: test/v1 (MDL_EXCLUSIVE)
# Good5: Seized: test/v1 (MDL_EXCLUSIVE)
# Good5-6: continue T@7 below
# Good7: Seized:   test/t1 (MDL_SHARED_READ)
# Good7: Waiting: test/f (MDL_SHARED)
# Good7-8: continue T@7 below
# Good9: Acquired: test/f (MDL_SHARED)
# Good9: Released: test/f (MDL_SHARED)
# Good9: Released: test/t1 (MDL_SHARED_READ)
# Good9: Released: test/v1 (MDL_EXCLUSIVE)
# Good9: command finished without error
# Bad1: Seized: test/v1 (MDL_EXCLUSIVE)
# Bad1: Seized: test/v1 (MDL_EXCLUSIVE)
# Bad1: Seized: test/t1 (MDL_SHARED_READ)
# Bad1-2: continue T@6 below
# Bad4: Waiting: test/f (MDL_SHARED)
# Bad4: Deadlock: test/f (MDL_SHARED)
# Bad4: command finished with error

--connection con1
--reap
--send
CREATE FUNCTION f() RETURNS INT RETURN 1;
# T@7
# Good3: Waiting: test/f (MDL_EXCLUSIVE)
# Good3-4: continue T@6 below
# Good6: Acquired: test/f (MDL_EXCLUSIVE)
# Good6-7: continue T@8 above
# Good8: Released: test/f (MDL_EXCLUSIVE)
# Good8-9: continue T@8 above
# Bad3: Waiting: test/f (MDL_EXCLUSIVE)
# Bad3-4: continue T@8 above

--connection default
set debug_sync= 'now wait_for s1';
--disable_result_log
SELECT * FROM ( SELECT * FROM v1 ) sq;
--enable_result_log
# T@6
# Good1: Seized:   test/v1 (MDL_SHARED_READ)
# Good1-2: continue T@8 above
# Good4: Seized:   test/t1 (MDL_SHARED_READ)
# Bad2: Waiting: test/v1 (MDL_SHARED_READ)
# Bad2-3: continue T@7 above

# Cleanup
COMMIT;
# Good4: Released: test/t1 (MDL_SHARED_READ)
# Good4: Released: test/v1 (MDL_SHARED_READ)
# Good4: Released: test/f (MDL_SHARED)
# Good4-5: continue T@8 above

--connection con2
--error 0, ER_SP_DOES_NOT_EXIST
--reap
--disconnect con1
--disconnect con2
--connection default
DROP VIEW v1;
DROP FUNCTION f;
DROP TABLE t1, t2;
set debug_sync= 'reset';