[ns] Questions about CBQ.cc

["chen c.y." <c.y.chen@bham.ac.uk>]

Hi,

I have a few questions of CBQ.cc while reading the code. Could anyone
explain te following method to me? Thanks in advance..

CBQ.cc

 // toplevel_departure:	called only using TL link sharing on departure

void
CBQueue::toplevel_departure(CBQClass *cl, double now)
{
	if (toplevel_ >= last_lender_->level_) {
		if ((cl->qmon_->pkts() <= 1) ||
		    last_lender_->undertime_ > now) {
			toplevel_ = MAXLEVEL;
		} else {
			toplevel_ = last_lender_->level_;
		}
	}
}

Questions:
1. what does 'TL' stand for?
2. what is the meaning of 'last_lender_' and 'last_lender_->level_'?
3. cl->qmon->pkt()<= 1: does this mean that while no packet exists in the
CBQ class?

regards,
Curtis 


=============================
Chuang-Yueh (Curtis) Chen

PhD student in Networking Technology
Electronic and Electrical School
University of Birmingham

E-mail: c.y.chen@bham.ac.uk
           curtischen73@yahoo.com

Fax: +44-121-4144291