[Click] newbie click programming question

[Beyers Cronje]

If you can mail me your element code (offlist) and config and I'll have a
quick look for you.

Beyers

On 9/21/05, Tomas Mahoney <tomasmahoney at yahoo.com> wrote:
>
> oops sorry - i meant (!p) does NOT seem to be doing
> the job...
>
> i check for (!p) before pulling a packet but it still
> seg faults every now and then presumably when the
> queue goes empty.
>
> thanks
> tomas
>
>
> --- Tomas Mahoney <tomasmahoney at yahoo.com> wrote:
>
> > hi beyers - thanks for the response.
> >
> > head() is simply inheriuted from simplequeue also.
> > it turns out that with
> > p = head()
> > if we print p then it always shows the same value.
> > so it appears that (!p) does seem to be doing the
> > job.
> > thanks
> > harry
> >
> >
> >
> > Beyers Cronje <bcronje at gmail.com> wrote:Hi Harry,
> >
> > Looking at SimpleQueue::deq() , if the Queue is
> > empty NULL is returned, else
> > a pointer to a valid packet descriptor is returned.
> > I'm not sure how you
> > implemented your head() function, but it should
> > function similar as
> > SimpleQueue::deq().
> >
> > So the following should work:
> >
> > p = head();
> > if (!p) // Null packet descriptor
> > return EMPTY_QUEUE;
> >
> > // Valid packet descriptor
> > ......
> >
> > Beyers
> >
> > On 9/19/05, Harry Lasas wrote:
> > >
> > > Hi Beyers and All:
> > >
> > > Thanks for your reply.
> > >
> > > How to check for a valid packet after calling
> > head()?
> > >
> > > if(*p)
> > >
> > > does not seem to work (Packet to bool)...
> > >
> > > Any input will help greatly.
> > > Thank you.
> > > Harry
> > >
> > >
> > >
> > > --- Beyers Cronje wrote:
> > >
> > > > Harry,
> > > >
> > > > Are you sure you are not working on an empty
> > queue ?
> > > > Ie you are not checking
> > > > for a valid packet after calling head().
> > > >
> > > > Beyers
> > > >
> > > > On 9/12/05, Harry Lasas wrote:
> > > > >
> > > > > I briefly RTFM and now tried something that
> > > > doesn't
> > > > > work.
> > > > >
> > > > > I am just trying to set up WTP algorithm on
> > Click
> > > > and
> > > > > need the waiting time of the packet at the
> > head of
> > > > a
> > > > > queue for that. I understand I can simply set
> > > > packet
> > > > > timestamp annotation in the Click config file
> > and
> > > > then
> > > > > try to do some (* gasp *:) arithmetic on that
> > to
> > > > get
> > > > > the waiting time.
> > > > >
> > > > > I created a queue that inherits from
> > simplequeue
> > > > and
> > > > > am trying to access the timestamp of the head
> > > > packet
> > > > > with something like
> > > > >
> > > > > Packet * p = head();
> > > > > currentTime = p->timestamp_anno();
> > > > >
> > > > > But it keeps seg faulting. Any idea why? Is
> > there
> > > > a
> > > > > better way to do what I am trying? Thank you.
> > > > >
> > > > >
> > > > > Harry Lasas
> > > > >
> > > > >
> > > > >
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