Re: [RTnet-developers] Ethernet IP

[Jan K. <jan...@we...>]

On 2011-02-08 16:52, Anders Blomdell wrote:
> On 02/08/2011 04:03 PM, Jan Kiszka wrote:
>> On 2011-02-08 16:00, Anders Blomdell wrote:
>>>>> The only other reason this could be "oops"ing is that I am reading and
>>>>> writing on the same socket and your example does not.
>>>>
>>>> We do in a less trivial application in the field. No complains from my
>>>> colleagues so far.
>>> With raw sockets I have problems reading and writing from/to the same
>>> socket
>>> when done from different threads (on my todo list to track this down
>>> some time
>>> in the future), might this be the same problem?
>>
>> You mean one thread reads and another writes? Or both mixed? What kind of
>> problems?
> At least with one thread reading and one writing.
> Some errno which I cant exctly recall (9x, something, might have been
> EADDRINUSE, but I'm not sure).

98 == EADDRINUSE. But that's only thrown by UDP and TCP, not AF_PACKET.

> My workaround was to read from the socket
> with a timeout, that way I was able to do everything in one thread (yes,
> I know it's not a long term solution).

Maybe there is same race and some missing locking. I would be interested
to hear more details / see a test case when you find some time.

Thanks,
Jan