Bilal AbuQadous wrote:
> Dear ns-users;
>
> I use ns-allinone-2.29 under cygwin/winXP.
>
> I faced the following problem after changing the MAC in ns2.29.
>
> during the simulation I got the follwoing Error:
>
> Scheduler: Event UID not valid!
>
> the code is here ( I made the changes just in the recv() function):
>
> void Mac::recv(Packet* p, Handler* h)
> {
>
> printf(" \n Now you are in Mac layer");
> int i;
> int k;
> int r;
> int errcount;
> int recR;
> //===================start=============================== BiLaL
> if (hdr_cmn::access(p)->direction() == hdr_cmn::UP)
> {
> if (hdr_mac::access(p)-> ftype() == MF_FEC_R)
> {
> Red_= hdr_mac::access(p)->Red();
> drop(p);
> printf(" \n Redundancy is CHANGED");
> return;
> }
> if (hdr_cmn::access(p)->size()%framesize_ != 0) k=1;
> else k=0;
>
> k +=(hdr_cmn::access(p)->size()+ Red_)/framesize_ ;
> for (i=0;i<= k; i++)
> {
> r=(rand()%100);
> if (r >= p_) errcount++;
> }
> if (errcount > Red_)
> {
> drop(p);//Packet::free(p); //discard the received packet
> printf("\n one packet has been lost");
>
> Packet *p = Packet::alloc();
> hdr_cmn* ch = HDR_CMN(p);
> hdr_mac* mhr = HDR_MAC(p);
> mhr->ftype()=MF_FEC_R;
> ch->uid() = 0;
> ch->ptype() = PT_MAC;
> ch->iface() = -2;
> ch->error() = 0;
> ch->size()=64;
> ch->direction() = hdr_cmn::DOWN;
> // *********** changing the Redundancy strategy
> mhr-> Red()= errcount;
>
> callback_=h;
> mhr->set(MF_FEC_R, index_);
> state(MAC_SEND);
> printf("\n telling the sender by new R");
> sendDown(p);
> }
>
> else {
> // the Redundant Data must be removed
> hdr_mac* mhr = HDR_MAC(p);
> recR = mhr-> Red();
> hdr_cmn::access(p)->size()-= recR;
> //===================END=============================== BiLaL
> sendUp(p);
> }
> return;
> }
>
> callback_ = h;
> hdr_mac* mh = HDR_MAC(p);
> mh->set(MF_DATA, index_);
> state(MAC_SEND);
> //=======================================================FEC (Redundancy)
> BiLaL
> printf("\n Here we adding the R to TCP packet");
> hdr_cmn* ch = HDR_CMN(p);
> ch->size() += Red_;
> //========================================================
> sendDown(p);
>
> the problem stop inside the sendDown() function and the problem as I told
> you first:
>
> Scheduler: Event UID not valid!
>
>
> I look forward to your help as soon as possible.
>
> thank you in advance
>
> Kind Regards
>
One possible reason to the "Event UID not valid!" problem is that the
event has been scheduled twice. You can print the relevant event in the
scheduler.cc, and see if that helps.
Kind Regards,
Mo
