my_bool mysql_thread_init(void)
      
Description
        This function must be called early within each created thread to
        initialize thread-specific variables. However, you may not
        necessarily need to invoke it explicitly:
        mysql_thread_init() is
        automatically called by
        my_init(), which itself is
        automatically called by
        mysql_init(),
        mysql_library_init(),
        mysql_server_init(), and
        mysql_connect(). If you invoke
        any of those functions,
        mysql_thread_init() will be
        called for you.
      
Return Values
Zero if successful. Nonzero if an error occurred.