登入MySQL运行语句注册UDF函数：
CREATE FUNCTION gman_do_background RETURNS STRING SONAME 'libgearman_mysql_udf.so';
这时报错：
ERROR 1126 (HY000): Can't open shared library 'libgearman_mysql_udf.so' (errno: 11 libgearman.so.8: cannot open shared object file: No such file or directory)
