When you perform a socket action, the listener determines that the action has failed if it failed to connect, send, or receive expected acknowledgement before timeout. 执行socket(套接字)操作时,如果监听器在超时前无法连接、发送或接收预期的确认,监听器将确认操作失败。
The traditional congestion control algorithms judge the congestion occurrence through the following ways: when packet is discarded, sender will receive greater than or equal to three repeated ACKs, or timeout of retransmission timer. 传统拥塞控制算法是通过丢弃数据包后,使发送端通过收到大于等于三个重复的ACK或者重传计时器超时的方式隐式的判断拥塞的发生。