CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
CREATE VIEW v1 AS SELECT myfunc_int(1);
SET debug_sync='mysql_create_function_after_lock SIGNAL locked WAIT_FOR go';
CREATE FUNCTION myfunc_double RETURNS REAL SONAME "UDF_EXAMPLE_LIB";
SET debug_sync='now WAIT_FOR locked';
SET debug_sync='find_udf_before_lock SIGNAL go';
SELECT * FROM v1;
myfunc_int(1)
1
FLUSH TABLES;
SET debug_sync='mysql_drop_function_after_lock SIGNAL locked WAIT_FOR go';
DROP FUNCTION myfunc_double;
SET debug_sync='now WAIT_FOR locked';
SET debug_sync='find_udf_before_lock SIGNAL go';
SELECT * FROM v1;
myfunc_int(1)
1
SET debug_sync='RESET';
DROP VIEW v1;
DROP FUNCTION myfunc_int;