Re: [lwip-users] ppp-new threading question

[Ivan Delamer]

Ok, that's what I thought. I will have to re-implement sio_write().

What I'm concerned also is, sio_write() is meant to block until all 
data is pushed out. This can be more than a second in a slow 9600bps 
connection (still used sometimes!!!). Will PPP try to do something 
during this time like try to re-send the packet or think it was lost? 
I'm not familiar with the internal ppp timer processes.

It also means more dynamic memory allocation since a reference to pbuf 
is not passed to sio_write().

Just thinking out loud I guess :-)

Cheers
Ivan


> Date: Fri, 29 Aug 2014 22:29:17 +0200
> From: Sylvain Rochet <address@hidden>
> To: Mailing list for lwIP users <address@hidden>
> Subject: Re: [lwip-users] ppp-new threading question
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Ivan,
>
>
> On Fri, Aug 29, 2014 at 10:16:04AM -0600, Ivan Delamer wrote:
> > I feel almost embarrassed asking this but I haven't completely
> > figured it out yet.
> >
> > In ppp-new, are packets sent to sio_write() from tcpip thread, or
> > from the RX process thread? Or both?
>
> tcpip thread only.
>
> (The stack owned RX process thread does not exist anymore, this was
> broken by design).
>
>
> > I just ask because sio_write() may block for some time (at least in
> > my basic implementation) and I'm wondering if this is blocking the
> > rest of the stack.
>
> Yes, it will, sio_write() should not block.
>
>
> Sylvain