tcp拥塞控制四种算法代码

以下是TCP拥塞控制四种算法的伪代码实现：

1. 慢启动（Slow Start）：

while (window_size < threshold) {
    send_packet();
    if (ack_received()) {
        window_size *= 2;
    }
}

2. 拥塞避免（Congestion Avoidance）：

while (true) {
    send_packet();
    if (ack_received()) {
        window_size += 1 / window_size;
    }
}

3. 快速重传（Fast Retransmit）：

while (true) {
    send_packet();
    if (ack_received()) {
        // do nothing
    } else if (duplicate_ack_received()) {
        retransmit_packet();
    } else {
        // timeout occurred
        retransmit_packet();
    }
}

4. 快速恢复（Fast Recovery）：

while (true) {
    send_packet();
    if (ack_received()) {
        if (window_size < threshold) {
            window_size += 1;
        } else {
            window_size += 1 / window_size;
        }
    } else if (duplicate_ack_received()) {
        window_size /= 2;
    } else {
        // timeout occurred
        threshold = window_size / 2;
        window_size = 1;
    }
}

请注意，这只是伪代码实现，实际实现可能会有所不同，并且可能涉及更多的细节和错误处理。