Re: [PATCH 4/4] lwip: Call if_change_flags() inside a thread-safe context

[Joan Lledó]

Missatge de Samuel Thibault <samuel.thibault@gnu.org> del dia dv., 3
de maig 2019 a les 0:02:
> In C, there is no need to explicit the cast from void*.

I'm doing a similar cast on lwip-util.c:256. Should I remove it too?

> Errno is a per-thread variable, you can not propagate the error this
> way. You can for instance add an int field to if_change_flags_args, to
> read it from if_change_flags and freeing it there.

Totally true, I forgot it.

If I add an output parameter to *args, then I need to wait for the
callback to finish before freeing *args. Because tcpip_callback()
returns immediatelly.

I'll try to find the way to wait for _ if_change_flags() to finish,
I'll do it also for the patch 3.