Re: [ns] getting queue length problem
PT version:
Hi ,
I saw a similar issue on
http://mailman.isi.edu/pipermail/ns-users/2003-January/028599.html
for accessing the length of the ifq in mac. I did their fix (see the post
above) but it still doesn't work for me. I still get a seg fault when the
program comes to
int queueLen= ll_->ifq()->length();
It's in a couple of "if" statement for null pointers...
if (ll_!=NULL){ //if the ll_ pointer is set
if(ll_->ifq()!=NULL){ //if the ll_->ifq_ pointer is
set
int queueLen= ll_->ifq()->length();
}
}
So that can't be the problem... I'm stuck!
Can anyone help me out?
Kathy
[ns] getting queue length problem
Hi ,
I saw a similar issue on
http://mailman.isi.edu/pipermail/ns-users/2003-January/028599.html
for accessing the length of the ifq in mac. I did their fix (see the post
above) but it still doesn't work for me. I still get a seg fault when the
program comes to
int queueLen= ll_->ifq()->length();
It's in a couple of "if" statement for null pointers...
if (ll_!=NULL){ //if the ll_ pointer is set
if(ll_->ifq()!=NULL){ //if the ll_->ifq_ pointer is
set
int queueLen= ll_->ifq()->length();
}
}
So that can't be the problem... I'm stuck!
Can anyone help me out?
Kathy
[ns] Attaching routing agent to nodes
Dear NS-users, I have created a new routing protocol that is almost completely in C++. The routing protocol is designed for WIRED routing and has all the basic properties (recv, command, forward_data, etc...). The problem I'm having is trying to determine how to attach my routing agent to my nodes. I can attach the agent using: $node attach-agent [new Agent/Proto ...] 255 but when I build applications and agents, they do not use my routing agent to route packets. (Probably still using default static routing). So, I'm trying to figure out what TCL code I need to add to make it such that my routing agent becomes the routing agent for the nodes. I have also tried adding TCL extensions similar to that of DV but I continuously get errors. For example, after telling the rtObject to add my protocol, I want to run a few protocol commands. I have set me protocol to an object rtproto but when I run the command: $rtproto cmd I get an error even though the error message is unclear, something like this: (_o46 cmd line 1) invoked from within "$rtproto cmd address [$node node-addr]" even though I'm 100% sure the command I ask for is excepted in my command function. Any help would be appreciated.
Re: [ns] Clearing a queue at a node in ns-2
Here is what I put in my code:
ll_->ifq_->reset();
which caused a segmentation fault initially. Those usually happen with NULL
pointers, so I changed it to this statement:
if (ll_!=NULL){
ll_->ifq_->reset();
}
but I found out that this "if" statement is never stepped into!
Can anyone help me out??
Kathy
On Fri, 9 Jun 2006, Shafiq Hashmi wrote:
> If you want to stop queueing at all, then
>
> in queue.cc, within void Queue::recv(Packet* p, Handler*) method, comment
> everything else but the line
> target_->recv(p, &qh_);
>
> I dont know whether will it answer your problem or not.
>
> Shafiq
>
>
>
>
>
>
> - Original Message - From: <[EMAIL PROTECTED]>
> To: "Pedro Vale Estrela" <[EMAIL PROTECTED]>
> Cc:
> Sent: Friday, June 09, 2006 6:32 PM
> Subject: Re: [ns] Clearing a queue at a node in ns-2
>
>
>>
>> Whoah, that is too complicated for me. I don't know ns-2 very well.
What
>> do you mean by:
>> "make a pointer to the ITF" -- doesn't it have a pointer (uptarget_)?
>> According to the diagram on pg 145 I should do uptarget_
>> ->downtarget_->reset()
>> since
>> uptarget will take me to the LL, downtarget will take me to the IFq, and
>> reset will reset the queue for that node.
>>
>> But this doesn't work. Uptarget_ gives me an NsObject instead of a LL
>> object...
>>
>>
>>
>> On Fri, 9 Jun 2006, Pedro Vale Estrela wrote:
>>
>>>
>>> Yes,
>>>
>>> http://www.isi.edu/nsnam/ns/doc/ns_doc.pdf
>>> pag 145,
>>>
>>> - at your C++ MAC module, make a pointer to the ITF;
>>> - either search the C++ NODE methods for getting the pointer
>>> reference you need (you want the reverse of the downtarget_ on the ITF;
>>> for
>>> making this, search the code that sets the downtarget_ variable in C++
in
>>> the ITF; (tip: use DDD, put a breakpoint somewhere in mobilenode.cc)
>>> in that moment, set something like:
>>> downtarget_->my_ITF_ = this;
>>>
>>> - then at the appropriate time, call reset() of it.
>>>my_ITF->reset();
>>>
>>> Of course that this is not good C++ Object-Orientation practices, but
use
>>> it
>>> to simply try your ideia; if it works nice, then make the same thing
with
>>> provte variables and public set/get methods.
>>>
>>>
>>> You can also perform the same trick by:
>>> Calling TCL / searching the ITF object you want based on the current
MAC
>>> object / call reset of it. The benefit is that you can fine tune this
>>> method
>>> without recompiling NS2 each time.
>>>
>>>
>>> If this works, please put this on the NS2 WIKI!
>>> Pedro Vale Estrela
>>>
>>>
Hi ns,
I'd like to clear a node's queue from the mac-layer in my simulation
after
I've received a certain packet. Can I call a PacketQueue function like
"reset()" from the mac layer? If not, how would I clear the queue?
Thanks!
Kathy
>>>
>>>
>>>
>>
>>
>>
>
>
>
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