Re: [lwip-users] Free LwIP resources

[AMSN]

Hi Steve, thanks a lot for your reply.

I need to start/stop the whole demo (web server + TCP/IP stack).

Thanks,
Regards



Stephen Cleary-3 wrote:
> 
> Richard's suggestion (processor reset) is the cleanest solution if you
> actually need to shut down the stack and reclaim all resources.
> 
> I think what you want to do is start/stop web servers (or even web sites
> within a single web server), not the TCP/IP stack.
> 
>        -Steve
> 
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf
> Of AMSN
> Sent: Thursday, September 08, 2011 5:26 AM
> To: address@hidden
> Subject: Re: [lwip-users] Free LwIP resources
> 
> 
> Hi Richard, thanks a lot for your reply.
> 
> Please excuse me if the previous message isn't clear.
> 
> my application is built around graphical library and FreeRTOS, it contains
> many modules for each module I associated a demo (for example web server). 
> I need to start, stop and restart again each module separately without
> stopping the whole application (without reset the microcontroller).
> 
> For the web server demo, I implement the following functions:
>    - Webserver_start(): used to initialize the LwIP stack and create demo
> tasks
>    - Webserver_stop(): used to delete demo tasks and set down and remove
> the
> netif
> 
> When I start the web server demo for the first time it works very well,
> but
> if I restart again the demo doesn't work correctly (the ping doesn’t work
> at
> all).
> 
> Below the code of Webserver_stop function:
> Webserver_stop()
> {
>  // delete all tasks
>   ….
> 
>  // Free LwIP resources
>   netif_set_down(&netif);
>   netif_remove(&netif);
> }
> 
> Thank you very much !
> Regards
> 
> 
> 
> 
> 
> 
> FreeRTOS info wrote:
>> 
>> 
>> 
>> 
>> On 08/09/2011 07:34, AMSN wrote:
>>> 
>>> Hi all,
>>> 
>>> I am using lwIP v1.3.2 with FreeRTOS v6.1.0. My application is a web
>>> server
>>> based on netconn API.
>>> I have four tasks: tcpip, Ethernet interface, http and dhcp.
>>> 
>>> I am looking for a method that allow the following:
>>> - delete all threads
>>> - free LwIP resources
>>> - set down and remove the netif
>>> Since I need to re-start the application again.
>>> 
>>> Please give me some comments.
>>> Thank you very much !
>> 
>> 
>> First - I don't know exactly what you are doing, so this suggestion
>> might not be appropriate, but if you are truly restarting the entire
>> application, then the simplest thing to do would reset the
>> microcontroller (either hard reset using the watchdog, or a soft reset
>> in software).
>> 
>> Second - I don't want to get into FreeRTOS support here.  This is an
>> lwIP list and FreeRTOS has its own support forum.  Superficially though,
>> as far as deleting FreeRTOS tasks go, then when you create a task using
>> xTaskCreate() you have the option of obtaining a handle to the task,
>> that can then be used to delete the task.  You must do that with care
>> though, if the task is blocked on a queue or such like.  You might also
>> want to delete the queues, etc.  So you don't get into memory
>> fragmentation problems though, it might be better to design your tasks
>> such that they can go back to their start rather than deleting them then
>> recreating them.
>> 
>> Restarting the lwIP tasks will cause the lwIP init and MAC driver
>> functions to be called again, on the assumption they are not called from
>> main() before the scheduler is started.  The effect will probably be
>> different depending on the type of memory management you are using (for
>> example, you don't want malloc() memory leaks if malloc() is used).  I
>> will let the lwIP experts answer that fully though.
>> 
>> 
>> Regards,
>> Richard.
>> 
>> + http://www.FreeRTOS.org
>> Designed for Microcontrollers.
>> More than 7000 downloads per month.
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> lwip-users mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/lwip-users
>> 
>> 
> 
> 
> -----
> AMSN
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-----
AMSN
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