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RE : [lwip-users] managing storage problems.

From: Frédéric BERNON
Subject: RE : [lwip-users] managing storage problems.
Date: Tue, 30 Oct 2007 09:58:50 +0100

This is a lwIP problem: you should never got a full mbox, due to the lwIP 
design. But, mainly, when a mbox is full, this is the netconn::recvmbox, or the 
tcpip.c::mbox (other mailboxes are used like "semaphores").

I will suppose you use last CVS HEAD. Since sys_mbox_post can't return an 
error, the workaround (without changing lwIP code) should be to implement the 
"free" inside your sys_mbox_post implementation. The main problem is to know 
what kind of "free" to do:

- tcpip.c::mbox only contains pbuf
- netconn::recvmbox can contains netbuf for UDP/RAW netconn, and pbuf for TCP.

If you know the full mbox is always an UDP one, I think you can directly use 
netbuf_delete on the pointer you have to post. It's not a clean solution, but 
should work.
Frédéric BERNON 
Chef de projet informatique 
Microsoft Certified Professional 
Tél. : +33 (0)4-67-87-61-10 
Fax. : +33 (0)4-67-70-85-44 
Email : address@hidden 
Web Site : http://www.hymatom.fr 
P Avant d'imprimer, penser à l'environnement

-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de shai katzir
Envoyé : mardi 30 octobre 2007 09:13
À : address@hidden
Objet : [lwip-users] managing storage problems.


I have a problem to deal with releasing packets when a receive mbox gets full. 
In my case, i have a binded UDP socket which doesn't do receive, but a remote 
computer keep sending packets to that socket. In this case, the receive mbox of 
that socket gets filled quickly. But, the lwip does nothing to deal with it. 
when the lwip does mbox_post it doesn't check if the mbox is full, and it 
relies that the packet will be fetched in the future, and will be released then.

what can i do to free those packets once the mbox is full?

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