Re: [lwip-users] Assertion : "tcp_enqueue: no pbufs on queue=>bothqueues empty"

[Mumtaz Ahmad]

It happens because  both threads uses pbuf related functions and thats the
main source of such assertions


----- Original Message ----- 
From: "Amir Bukhari" <address@hidden>
To: "Mailing list for lwIP users" <address@hidden>
Sent: Tuesday, October 31, 2006 4:23 PM
Subject: AW: [lwip-users] Assertion : "tcp_enqueue: no pbufs on
queue=>bothqueues empty"


>
> Yes, I have 2 real time task which access the same connection, but one
only sends and the second task read and send data.
>
> This case should not case an assertion, its application problem to handle
such case, but TCP/IP stack should not be affected with such or I am wrong
>
> What can happened if both queue is embty, does lwip will crash?
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: address@hidden
[mailto:address@hidden Im Auftrag von
Mumtaz Ahmad
> Gesendet: Dienstag, 31. Oktober 2006 10:37
> An: Mailing list for lwIP users
> Betreff: Re: [lwip-users] Assertion : "tcp_enqueue: no pbufs on queue
=>bothqueues empty"
>
> Dear amir
>
> Its most probably the mutiple threading issue.
>
>
>
> ----- Original Message ----- 
> From: "Amir Bukhari" <address@hidden>
> To: <address@hidden>
> Sent: Tuesday, October 31, 2006 2:28 PM
> Subject: [lwip-users] Assertion : "tcp_enqueue: no pbufs on queue =>
> bothqueues empty"
>
>
> > I use lwip in a embedded system, one time I have got this the following
> message:
> > "tcp_enqueue: no pbufs on queue => both queues empty"
> > Exactly on this line:
> > LWIP_ASSERT("tcp_enqueue: no pbufs on queue => both queues empty",
> >       pcb->unacked == NULL && pcb->unsent == NULL);
> >
> > in tcp_out.c
> >
> > what case such assertion?
> > ----------------------------------------------------------
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> >
> >
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>
>
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