mariadb/mysql-test/main/udf_debug_sync.test

--source include/have_debug_sync.inc
--source include/have_udf.inc

#
# MDEV-5616 - Deadlock between CREATE/DROP FUNCTION and SELECT from view
#
--replace_result $UDF_EXAMPLE_SO UDF_EXAMPLE_LIB
eval CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "$UDF_EXAMPLE_SO";
CREATE VIEW v1 AS SELECT myfunc_int(1);
connect(con1, localhost, root,,);

connection con1;
SET debug_sync='mysql_create_function_after_lock SIGNAL locked WAIT_FOR go';
--replace_result $UDF_EXAMPLE_SO UDF_EXAMPLE_LIB
send_eval CREATE FUNCTION myfunc_double RETURNS REAL SONAME "$UDF_EXAMPLE_SO";

connection default;
SET debug_sync='now WAIT_FOR locked';
SET debug_sync='find_udf_before_lock SIGNAL go';
SELECT * FROM v1;
FLUSH TABLES;

connection con1;
reap;
SET debug_sync='mysql_drop_function_after_lock SIGNAL locked WAIT_FOR go';
send DROP FUNCTION myfunc_double;

connection default;
SET debug_sync='now WAIT_FOR locked';
SET debug_sync='find_udf_before_lock SIGNAL go';
SELECT * FROM v1;

connection con1;
reap;
disconnect con1;

connection default;
SET debug_sync='RESET';
DROP VIEW v1;
DROP FUNCTION myfunc_int;