Tests of synchronization of stored procedure execution.
SET DEBUG_SYNC= 'RESET';
#
# Bug #30977 Concurrent statement using stored function and
#            DROP FUNCTION breaks SBR
#
# A stored routine could change after dispatch_command()
# but before a MDL lock is taken. This must be noticed and the
# sp cache flushed so the correct version can be loaded.
#
connect  con2, localhost, root;
connection default;
CREATE FUNCTION f1() RETURNS INT RETURN 1;
# Get f1 cached
SELECT f1();
f1()
1
# Then start executing it again...
SET DEBUG_SYNC= 'before_execute_sql_command SIGNAL before WAIT_FOR changed';
# Sending:
SELECT f1();
connection con2;
SET DEBUG_SYNC= 'now WAIT_FOR before';
# ... but before f1 is locked, change it.
DROP FUNCTION f1;
CREATE FUNCTION f1() RETURNS INT RETURN 2;
SET DEBUG_SYNC= 'now SIGNAL changed';
# We should now get '2' and not '1'.
connection default;
# Reaping: SELECT f1()
f1()
2
disconnect con2;
DROP FUNCTION f1;
SET DEBUG_SYNC= 'RESET';
#
# Field translation items must be cleared in case of back-offs
# for queries that use Information Schema tables. Otherwise 
# memory allocated in fix_fields() for views may end up referring
# to freed memory.
#
DROP FUNCTION IF EXISTS f1;
connect  con2, localhost, root;
connect  con3, localhost, root;
connection default;
CREATE FUNCTION f1() RETURNS INT RETURN 0;
connection con2;
SET DEBUG_SYNC= 'after_wait_locked_pname SIGNAL locked WAIT_FOR issued';
# con2 will now have an x-lock on f1
# Sending:
ALTER FUNCTION f1 COMMENT 'comment';
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
# This query will block due to the x-lock on f1 and back-off
SHOW OPEN TABLES WHERE f1()=0;
connection con3;
# Check that the IS query is blocked before releasing the x-lock
SET DEBUG_SYNC= 'now SIGNAL issued';
connection default;
# Reaping: ALTER FUNCTION f1 COMMENT 'comment'
DROP FUNCTION f1;
SET DEBUG_SYNC= 'RESET';
disconnect con2;
disconnect con3;
#
# Bug #48246 assert in close_thread_table
#
CREATE TABLE t0 (b INTEGER);
CREATE TABLE t1 (a INTEGER);
CREATE FUNCTION f1(b INTEGER) RETURNS INTEGER RETURN 1;
CREATE PROCEDURE p1() SELECT COUNT(f1(a)) FROM t1, t0;
INSERT INTO t0 VALUES(1);
INSERT INTO t1 VALUES(1), (2);
connect  con2, localhost, root;
CALL p1();
COUNT(f1(a))
2
SET DEBUG_SYNC= 'after_open_table_mdl_shared SIGNAL locked_t1 WAIT_FOR go_for_t0';
# This call used to cause an assertion. MDL deadlock with upcoming
# LOCK TABLES statement will cause back-off and retry.
# A variable indicating if a prelocking list exists, used to be not
# reset properly causing an eventual assert.
# Sending:
CALL p1();
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked_t1';
# Issue LOCK TABLES statement which will enter in MDL deadlock
# with CALL statement and as result will cause it to perform
# back-off and retry.
SET DEBUG_SYNC= 'mdl_acquire_lock_wait SIGNAL go_for_t0';
LOCK TABLES t0 WRITE, t1 WRITE;
UNLOCK TABLES;
connection con2;
# Reaping: CALL p1()
COUNT(f1(a))
2
connection default;
disconnect con2;
DROP PROCEDURE p1;
DROP FUNCTION f1;
DROP TABLES t0, t1;
#
# test for bug#11756013
#
DROP SCHEMA IF EXISTS s1;
CREATE SCHEMA s1;
CREATE PROCEDURE s1.p1() BEGIN END;
connect  con3, localhost, root;
SET DEBUG_SYNC='before_db_dir_check SIGNAL check_db WAIT_FOR dropped_schema';
CALL s1.p1;
connection default;
SET DEBUG_SYNC='now WAIT_FOR check_db';
DROP SCHEMA s1;
SET DEBUG_SYNC='now SIGNAL dropped_schema';
connection con3;
ERROR 42000: Unknown database 's1'
connection default;
disconnect con3;
SET DEBUG_SYNC = 'RESET';