drop-tail.cc
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- /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
- /*
- * Copyright (c) 1994 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the Computer Systems
- * Engineering Group at Lawrence Berkeley Laboratory.
- * 4. Neither the name of the University nor of the Laboratory may be used
- * to endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef lint
- static const char rcsid[] =
- "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/queue/drop-tail.cc,v 1.13 2002/01/01 04:26:10 sfloyd Exp $ (LBL)";
- #endif
- #include "drop-tail.h"
- static class DropTailClass : public TclClass {
- public:
- DropTailClass() : TclClass("Queue/DropTail") {}
- TclObject* create(int, const char*const*) {
- return (new DropTail);
- }
- } class_drop_tail;
- void DropTail::reset()
- {
- Queue::reset();
- }
- int
- DropTail::command(int argc, const char*const* argv) {
- if (argc==2) {
- if (strcmp(argv[1], "printstats") == 0) {
- print_summarystats();
- return (TCL_OK);
- }
- }
- if (argc == 3) {
- if (!strcmp(argv[1], "packetqueue-attach")) {
- delete q_;
- if (!(q_ = (PacketQueue*) TclObject::lookup(argv[2])))
- return (TCL_ERROR);
- else {
- pq_ = q_;
- return (TCL_OK);
- }
- }
- }
- return Queue::command(argc, argv);
- }
- /*
- * drop-tail
- */
- void DropTail::enque(Packet* p)
- {
- if (summarystats) {
- Queue::updateStats(qib_?q_->byteLength():q_->length());
- }
- //printf("HERE ENQUES...p: %ldn", p);
- q_->enque(p);
- int qlimBytes = qlim_ * mean_pktsize_;
- if ((!qib_ && q_->length() >= qlim_) ||
- (qib_ && q_->byteLength() >= qlimBytes)) {
- //printf("qib_: %dn", qib_);
- //printf("q_->length(): %d qlim_: %dn", q_->length(), qlim_);
- if (drop_front_) { /* remove from head of queue */
- Packet *pp = q_->deque();
- drop(pp);
- } else {
- //printf("HERE REMOVEn");
- q_->remove(p);
- drop(p);
- }
- }
- }
- Packet* DropTail::deque()
- {
- //printf("DropTail::deque() calledn");
- if (summarystats && &Scheduler::instance() != NULL) {
- Queue::updateStats(qib_?q_->byteLength():q_->length());
- }
- return q_->deque();
- }
- //JUNGMIN
- int DropTail::BuildQState(int* q_array, int size)
- {
- return q_->BuildQState(q_array, size);
- }
-
- void DropTail::ReturnPacket(Packet *p)
- {
- q_->enqueHead(p);
- }
- //end of JUNGMIN
- void DropTail::print_summarystats()
- {
- //double now = Scheduler::instance().clock();
- printf("True average queue: %5.3f", true_ave_);
- if (qib_)
- printf(" (in bytes)");
- printf(" time: %5.3fn", total_time_);
- }