Hi,
To make this thread get more visible attention, I changed the subject name
to "one small feature request to implement event/state mask", also copied
Pekka to address this request.
Frankly speaking, I don't have overhead statistics of those extra event
reported to application layer. But as we know,
according to Sofia's architecture implment philosophy, every ( almost? )
event and state change signal associated with callback funtion is at first
inserted and queued into a internal list whose element will be popped and
executed asynchronously. I don't get those function profiling data, but
let's roughly image, we have overhead of callback function invoke, internal
event/signal queuing/popping. It maybe trivial overhead compared to whole
application logic processing, but let's say if our system is fully loaded
with huge call volume. Those little overhead could accumulates to a certain
level which we can definitely save to our real application logic. Why not ?
:-)
So my humble proposal is that we implement bitwise event/signal mask just
like "pthread_signal_mask" provided by most posix thread library. With that
let's say, for example, application programmer masks certain event/signal
which he is not interested. When those events are triggered, we don't need
insert to sofia internal queue any more.
Mikhail,
For the "CANCEL" question, I tried "APPL_METHOD" before I writed mail to
mail list, but failed. I think, stack code change is needed.
Thanks
kandy
2008/10/28 <[EMAIL PROTECTED]>
> Hi,
>
> ------------------------------
> *From:* ext liu yang [mailto:[EMAIL PROTECTED]
> *Sent:* Tuesday, October 28, 2008 10:49 AM
> *To:* sofia-sip-devel@lists.sourceforge.net
> *Subject:* [Sofia-sip-devel] disable automatically 200OK response to
> incomingCANCEL
>
> Hi all,
> Actually I have two question here.
> First one is the one explained in mail subject. In detail, we know, sofia
> stack automatically responds with 200OK for incoming CANCEL.
> My purpose is just to add an special customized SIP header into this 200OK.
> By checking related code, I didn't find any clue to achieve this.
> So without modifying stack code, is there any simple way, like including a
> TAG somewhere to meet my requirement?
>
>
> Try to list CANCEL in NUTAG_APPL_METHOD string.
>
> Second one is more specific to sofia fundamental framework, which is I
> expect to prevent some event/signal from being reported to application.
> The mechanism is just like, we unmask certain OS signal using
> 'pthread_signal_mask'. With this methodology, sofia stack only sends event
> which application
> layer is interested upwards to save both a bit cpu usage of upper
> application and sofia stack.
>
> How much CPU usage you're aiming to save, is it anywhere comparable with,
> say, media processing?
> There are no filters or masks for events AFAIK, but I don't see much use
> for them.
>
> Best regards,
> Mikhail
>
>
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