麻烦您帮忙解释下，谢谢

[Dayu0501]

if (_curr_buf->status == cell_buffer::FREE) {
_curr_buf->status = cell_buffer::FULL; // set to FULL
cell_buffer* next_buf = _curr_buf->next;
// tell backend thread 通知消费者线程把cell中的log更新到文件。
tell_back = true;

  // it suggest that this buffer is under the persist job
  if (next_buf->status == cell_buffer::FULL) {
    // if mem use < MEM_USE_LIMIT, allocate new cell_buffer
    if (_one_buff_len * (_buff_cnt + 1) > MEM_USE_LIMIT) {
      fprintf(stderr, "no more log space can use\n");
      _curr_buf = next_buf;
      _lst_lts = curr_sec;
    } else {
      cell_buffer* new_buffer = new cell_buffer(_one_buff_len);
      _buff_cnt += 1;
      new_buffer->prev = _curr_buf;
      _curr_buf->next = new_buffer;
      new_buffer->next = next_buf;
      next_buf->prev = new_buffer;
      _curr_buf = new_buffer;
    }
  } else {
    // next buffer is free, we can use it
    _curr_buf = next_buf;
  }
  if (!_lst_lts) _curr_buf->append(log_line, len);
} else  //_curr_buf->status == cell_buffer::FULL, assert persist is on here
        // too!
{
  _lst_lts = curr_sec;
}

当cell buffer满了的时候，不是应该寻找下一个空的cell buffer吗，为什么这个是没有处理的？