[ECOS] ecos + lwip

Mandeep Sandhu mandeepsandhu.chd@gmail.com
Thu Sep 3 10:23:00 GMT 2009


On Thu, Sep 3, 2009 at 2:49 PM, Simon Kallweit<simon.kallweit@intefo.ch> wrote:
> Mandeep Sandhu wrote:
>>
>> On Thu, Sep 3, 2009 at 2:34 PM, Simon Kallweit<simon.kallweit@intefo.ch>
>> wrote:
>>>
>>> Mandeep Sandhu wrote:
>>>>
>>>> On Thu, Sep 3, 2009 at 2:22 PM, Simon Kallweit<simon.kallweit@intefo.ch>
>>>> wrote:
>>>>>
>>>>> Mandeep Sandhu wrote:
>>>>> There is a semaphore created in cyg_lwip_sequential_init() which will
>>>>> block
>>>>> until all initialization (including ethernet devices) in the tcpip
>>>>> thread
>>>>> is
>>>>> done. Therefore it's priority does not matter.
>>>>> cyg_lwip_sequential_init()
>>>>> should not return before initialization is completed.
>>>>>
>>>>> I just reviewed the code and found that the semaphore is initialized
>>>>> with
>>>>> 1,
>>>>> which is clearly a bug, it should be initialized with 0 so that the
>>>>> following call to cyg_semaphore_wait() is actually blocking the thread
>>>>> until
>>>>> initialization is done.
>>>>>
>>>>> My mistake, sorry! Hope it works as intended now. New release:
>>>>>
>>>>> http://download.westlicht.ch/lwip-20090903.tar.gz
>>>>
>>>> Thanks Simon. I totally missed the sem init part...i guess since the sem
>>>> is
>>>> init to 1...the thread never actually waits...and thats why I was seeing
>>>> the
>>>> problem.
>>>
>>> Exactly. I glanced over this code more than once and it didn't occur to
>>> me.
>>> Thanks a lot for testing! This is really helpful.
>>
>> No problem. I'm just glad I'm able to help.
>>
>> I downloaded your new rel. It still had that sem init'ed to 1! That should
>> be
>> 0 right? If thats the only change I'll do it in my local copy and test it.
>
> Oh my, git tricked me :) Yeah, this should be 0. Please see if that works.
> It did for me, before git tricked me, hehe

Yup. It worked! Thanks Simon.

Regards,
-mandeep

>
> Simon
>

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