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Re: [lwip-users] [EXTERNAL] Re: LWIP_NETCONN_FULLDUPLEX sys_mbox_free ex

From: Kellar, Christopher
Subject: Re: [lwip-users] [EXTERNAL] Re: LWIP_NETCONN_FULLDUPLEX sys_mbox_free example
Date: Fri, 16 Feb 2018 14:36:46 +0000


First thank you for your very fast reply. I think that was record time for me 
on any blog.

Second, I am glad to hear that this is being reported. I was thinking that I 
was doing something odd. I am running lwIP and really am in need of full duplex 
mode. The reason for this is because on top of lwIP I am running a RabbitMq 
client which really requires a full duplex solution to have high bandwidth. I 
am running a similar RabbitMq client in full duplex on CentOS.

I will continue to investigate and try to find a solution. Do you think that a 
solution on your end is on the horizon?

Thanks again,

-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of Simon Goldschmidt
Sent: Friday, February 16, 2018 9:28 AM
To: address@hidden
Subject: [EXTERNAL] Re: [lwip-users] LWIP_NETCONN_FULLDUPLEX sys_mbox_free 

Kellar, Christopher wrote:
> Could you please provide an example of what the sys_mbox_free should
> look like when LWIP_NETCONN_FULLDUPLEX = 1 (has to unblock receive
> tasks waiting on recvmbox/acceptmbox and prevent a task pending on
> this during/after deletion)? I am trying to implement this on an STM32 device 
> running FreeRTOS.

Besides DHCPv6, solving this in a general way is one of the last steps to 2.1.0.
See https://savannah.nongnu.org/bugs/?52554

> I am also seeing some failures when I attempt to close the netconn from a 
> third thread.
> The code is hanging inside lwip_netconn_do_delconn  on the
> sys_sem_signal because either the op_completed_sem semaphore variable is 
> corrupted.

That's also covered by the above bug report.

What's your background on this, do you have code that runs this way (e.g. under 
linux) but fails with lwIP or do you just try to program something full duplex?

> I would really appreciate some assistance.

I don't know when I'll find the time for this, though.


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