关于LWIP拔网线后阻塞，插上网线无法重连的问题

只看该作者 · 2014-6-25 15:17

测试过程：先连接上服务器，然后拔掉网线，就阻塞在

void sys_mbox_fetch(sys_mbox_t mbox, void **msg)
{
  u32_t time;
  struct sys_timeouts *timeouts;
  struct sys_timeout *tmptimeout;
  sys_timeout_handler h;
  void *arg;

again:
  timeouts = sys_arch_timeouts();

  if (!timeouts || !timeouts->next) {
sys_arch_mbox_fetch(mbox, msg, 0);
  } else {
if (timeouts->next->time > 0) {
   time = sys_arch_mbox_fetch(mbox, msg, timeouts->next->time);
} else {
   time = SYS_ARCH_TIMEOUT;
}

if (time == SYS_ARCH_TIMEOUT) {
   /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
could be fetched. We should now call the timeout handler and
deallocate the memory allocated for the timeout. */
   tmptimeout = timeouts->next;
   timeouts->next = tmptimeout->next;
   h = tmptimeout->h;
   arg = tmptimeout->arg;
   memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
   if (h != NULL) {
      LWIP_DEBUGF(SYS_DEBUG, ("smf calling h=%p(%p)\n", (void *)h, (void *)arg));
      h(arg);
   }

   /* We try again to fetch a message from the mbox. */
   goto again;
}
else
{
   /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
occured. The time variable is set to the number of
milliseconds we waited for the message. */
   if (time <= timeouts->next->time) {
  timeouts->next->time -= time;
   } else {
  timeouts->next->time = 0;
   }
}

  }
}
仿真发现老是运行到 time = SYS_ARCH_TIMEOUT;，然后跳回again。发送函数netconn_write(struct netconn *conn, void *dataptr, u16_t size, u8_t copy)总是返回一个ERR_MEM,是内存分配错误。然后我插上网线，永远也连接不上服务器了，执行连接函数后err_t
netconn_connect(struct netconn *conn, struct ip_addr *addr,
   u16_t port)
执行里面的sys_mbox_fetch(conn->mbox, NULL),返回的conn->err为0xFD，即-3,LWIP定义相应的宏为ERR_ABRT,即连接断开，一直这样，无法连接，求大侠指导！！怎么才能重新连接上服务器。。。。