  Locked_tables_list()
    :m_locked_tables(NULL),
    m_locked_tables_last(&m_locked_tables),
    m_reopen_array(NULL),
    m_locked_tables_count(0),
    some_table_marked_for_reopen(0)
  {
    init_sql_alloc(&m_locked_tables_root, MEM_ROOT_BLOCK_SIZE, 0,
                   MYF(MY_THREAD_SPECIFIC));
  }
  Locked_tables_list()
    :m_locked_tables(NULL),
    m_locked_tables_last(&m_locked_tables),
    m_reopen_array(NULL),
    m_locked_tables_count(0),
    some_table_marked_for_reopen(0)
  {
    init_sql_alloc(&m_locked_tables_root, MEM_ROOT_BLOCK_SIZE, 0,
                   MYF(MY_THREAD_SPECIFIC));
  }