What does it mean: ioq_select Attempting to replace UDP socket NN

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On Thu, Jun 28, 2012 at 9:04 PM, Tom Merriewether <
tmerriewether at star2star.com> wrote:

> I am running PJSIP over a TCP proxy on the iPhone.
> My app is getting killed with SBUnsuspendLimit exceeded 15 wakes in 300
> seconds.  I am about to file a bug report with Apple because I see no
> evidence of this in my application's log (where we capture all PSJIP
> messages at logging level 5).  The application most recently crashed in the
> background after a flurry of these PJSIP messages:
>
> PLOG --> 2012-06-27 18:38:51.872 Star2Star[158:7303] SIP PJSIP message:
>  18:38:51.872     ioq_select  UDP has been replaced successfully!
>
> PLOG --> 2012-06-27 18:38:51.872 Star2Star[158:7303] SIP PJSIP message:
>  18:38:51.872     ioq_select  Attempting to replace UDP socket 45
>
> PLOG --> 2012-06-27 18:38:51.872 Star2Star[158:7303] SIP PJSIP message:
>  18:38:51.872     ioq_select  UDP has been replaced successfully!
>
> PLOG --> 2012-06-27 18:38:51.873 Star2Star[158:7303] SIP PJSIP message:
>  18:38:51.873     ioq_select  Attempting to replace UDP socket 46
>
> PLOG --> 2012-06-27 18:38:51.873 Star2Star[158:7303] SIP PJSIP message:
>  18:38:51.873     ioq_select  UDP has been replaced successfully!
>
> I'm not reading this as a flurry of incoming packets on the SIP signaling
> socket,  but since I don't know what this means I may be wrong.
>
> Can anybody tell me what this message means?  For example,  is it an
> indication of incoming I/O on the signaling socket that would account for
> an excessive number of background wakes???
>
>
>

First of all please see http://trac.pjsip.org/repos/ticket/1482 for more
info about the problem. The solution mentioned there are part of 1.14 and
2.0 release, so please upgrade if you're using older version.

When app is woken up, UDP sockets are reset by iOS and it needs to be
recreated to make it work again. So if anything, the message is just an
indication that your app has just been woken up.

Cheers
 Benny
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