Re: [lwip-users] LWIP - TCP receive assert failed

[Sg]

Xiaowen,

there were many many bug fixed since that old Version. I'd strongly advise 
to upgrade! Also in the PPP stack there are bugs fixed!

Cheers,
Simon


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Am 23. Januar 2015 16:55:34 schrieb Jackie <address@hidden>:

> Hi Simon,
>
> Yes, I am using a very old version of LWIP. I don't know the version
> number though, it should be older than 1.1.0. It is from our supplier,
> and I think the issue I encountered (mentioned below) is also from the
> supplier.
>
> So basically it is not a good idea to use sys_sem_wait() in the context
> of tcpip_thread(), in case probably tcp_output() is called recursively.
>
> Best,
> Xiaowen
>
>
>
> On 01/23/15 00:25, Simon Goldschmidt wrote:
> >  Jackie wrote:
> >
> >> After re-examining the code, finally I got more understanding of what 
> can cause this problem. Instead of more than one threads are calling 
> tcp_output(), there is only one thread tcpip_thread(), but in which 
> tcp_output() is called recursively.
> >>
> >> The case happens when the lower-layer protocol (PPP) uses 
> sys_sem_wait(). In this function, it is not only waiting a semaphore, but 
> it also gives the timer chances to run.
> >
> > This was a known bug which should be fixed for a long time. Are you using 
> an old version of lwIP?
> >
> > Simon
> >
> > _______________________________________________
> > lwip-users mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/lwip-users
> >
>
>
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