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 <[email protected]>:
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
>
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