[ns] deque function of MyQueue class NOT being called

[Parag Kulkarni]

Dear ns-users,
       I wrote my new Active Queue Management scheme (MyQueue). I did
the following
- added myqueue.cc and myqueue.h under ns-2.27/queue/
- added myqueue.o in Makefile
- added default values for the variables in tcl/lib/ns-default.tcl

I am logging debug info in C++. The code runs ok except that
myqueue->deque() function is called only once on the arrival of the
first packet. It is never called thereafter. The simulation runs to
the end and the queue basically behaves like drop tail (since deque is
not being called more than once, the queue size reaches max value and
behaves like a droptail queue)

Simulation Topology --> n sources sending to a bottleneck router which
in turn forwards it to a traffic sink.

My deque functions looks like this

Packet* MyQueue::deque() {
       double now = Scheduler::instance().clock();
       Packet *p = q_->deque();
       hdr_cmn* ch;

       if (p != 0) {
               ch               = hdr_cmn::access(p);
               int pklen        = 8*ch->size(); // pklen in bits
               qlen_bits_      -= pklen;       // decrement qlen_bits
               q_len_          -= 1;           // decrement qlen in pkts
               if(q_len_<0)
                       q_len_=0;
               // compute average queue length
               ave_q_len_ = (1-qw_)*ave_q_len_+ qw_*q_len_;

               total_bits_sent_ += pklen;
               total_pkts_sent_ += 1;
       }
       // to compute link-utilisation
       if(total_pkts_sent_ == 1) {
               // this is when the first pkt is being sent
               start_time_     = now;  // set start time to now.
               total_bits_sent_= 0;    // reset total_bits_sent to 0
       }
       else {
               link_utilisation_ = total_bits_sent_ /
((now-start_time_)*link_bw_);
       }
       return (p);
}// end of function MyQueue:deque()

I already read chapter7 from the ns manual which talks about blocking
unblocking.  Checked out the deque of other queueing strategies
(DropTail / RED) and my deque function looks more or less the same.
Have checked the archives too but no luck. Can anybody please help me
out with this problem as to why deque is NOT being called. Any
pointers will be appreciated.

Thanks a lot in advance.

Parag