tcp.c文件的tcp_enqueue_partial函数

978计划工作组 2009-8-27

1函数源码

/*

 *     Queue a partial frame

 */

void tcp_enqueue_partial(struct sk_buff * skb, struct sock * sk)

{

         struct sk_buff * tmp;

         unsigned long flags;

         save_flags(flags);

         cli();

         tmp = sk->partial;

         if (tmp)

                   del_timer(&sk->partial_timer);

         sk->partial = skb;

         init_timer(&sk->partial_timer);

         /*

          *     Wait up to 1 second for the buffer to fill.

          */

         sk->partial_timer.expires = HZ;

         sk->partial_timer.function = (void (*)(unsigned long)) tcp_send_partial;

         sk->partial_timer.data = (unsigned long) sk;

         add_timer(&sk->partial_timer);

         restore_flags(flags);

         if (tmp)

                   tcp_send_skb(sk, tmp);

}

2函数用途

负责将入参的skb增加到partial对列中，如partial对列中已有数据则将其通过调用tcp_send_skb函数发送出去。

3调用关系

tcp_write

|__tcp_enqueue_partial

|__tcp_send_partial

        |__tcp_dequeue_partial ->tcp_send_skb

4语句注释

此处语句比较简单，请参见1至18文章中的注释。