[ns] accessing queue length in 802.11 MAC

[St4Ski0]

Hi, anyone as tested this method?
I've insert following code in mac-802_11.cc in recvDATA() but i've
segmentation fault problem...why if i test if the pointer is non-null?

	int pkt_in_q = 0;

	//Thesis
	if ( ((LL *)uptarget_)->ifq()){
		//code if non-null
		pkt_in_q = ((LL *)uptarget_)->ifq()->length();
		printf("non-null queue \n");
	} else {
		// code if null
		printf("null queue \n");
	}


M. Shen wrote:
> 
> 
> Dear guys,
> 
> I tried to access queue length in MAC. So I wrote 
> int pkt_num = ((LL *)uptarget_)->ifq()->length(); 
> 
> When I run the simulation us gdb, segmentation fault occurs. I shows
> that
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x080c3ad4 in Queue::length() (this=0x0) at queue/queue.h:136
> 136 int length() { return pq_->length(); }  /* number of pkts currently
> in
> 
> Does any one know how to deal with this problem?
> 
> Thank you very much,
> Min
> 
> 
> 

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