[lwip-users] Re: [lwip] pbuf_free

[Conny Öhult]

Hope you noticed this in the rawapi.txt document at 
http://www.sics.se/~adam/lwip/documentation.html

- err_t udp_send(struct udp_pcb *pcb, struct pbuf *p)
Sends the pbuf p. The pbuf is not deallocated.

tcp on the other hand will handle deallocation of the pbuf

You application should deallocate the udp pbuf.

/Conny

>At a quick look it seems that tcp_output calls ip_output(p,...) and then
>pbuf_free(p) while udp_send directly calls ip_output_if without freeing
>pbuf after the call....???????
>
>On Tue, 16 Apr 2002, Mumtaz Ahmad wrote:
>
> > There is no pbuf_free in low_level_output .So how come the pbufs that are
> > allocated for out packets gets freed?
> > I am getting the problem of non availability of pbufs in UDP tests when i
> > send lot of data .The problem is solved when i insert pbuf_free in
> > low_level_output function ,but the same solution produces troubles when i
> > use TCP socket .TCP seems OK even with no pbuf_free in low_level_output and
> > i never get any message of shortage of pbufs while using a TCP connection.
> > Any commenst ?
> >
> >
> >
> >        _o
> >     _< \_
> >    (_) >(_)
> >    -------------
> >
> >
> > [This message was sent through the lwip discussion list.]
> >
>
>[This message was sent through the lwip discussion list.]

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Conny Öhult
Luleå University of Technology
Department of Computer Science and Electrical Engineering
SE-971 87 LULEÅ, Sweden
Phone: 0920-49 1577 (Intl: +46 920 49 1577)
Fax: 0920-49 2191 (Intl: +46 920 49 2191)
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