[lwip-users] [lwip] why is netif declared static in ip_output()?

[leon . woestenberg]

Hello,

why is netif declared static in ip_output()?

This brings concurrency problems if, in a pre-emptive multitasking
environment, concurrent calls to ip_output() occur.

err_t
ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
        u8_t ttl, u8_t proto)
{
  static struct netif *netif;

  ... <- critical section for staticly declared netif variable

 return ip_output_if(p, src, dest, ttl, proto, netif);

Leon.

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