00001 /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */ 00002 /* 00003 * Copyright (c) 1994 Regents of the University of California. 00004 * All rights reserved. 00005 * 00006 * Redistribution and use in source and binary forms, with or without 00007 * modification, are permitted provided that the following conditions 00008 * are met: 00009 * 1. Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * 2. Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * 3. All advertising materials mentioning features or use of this software 00015 * must display the following acknowledgement: 00016 * This product includes software developed by the Computer Systems 00017 * Engineering Group at Lawrence Berkeley Laboratory. 00018 * 4. Neither the name of the University nor of the Laboratory may be used 00019 * to endorse or promote products derived from this software without 00020 * specific prior written permission. 00021 * 00022 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00023 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00024 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00025 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00026 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00027 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00028 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00029 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00030 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00031 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00032 * SUCH DAMAGE. 00033 * 00034 * @(#) $Header: /cvsroot/nsnam/ns-2/queue/drop-tail.h,v 1.19 2004/10/28 23:35:37 haldar Exp $ (LBL) 00035 */ 00036 00037 #ifndef ns_drop_tail_h 00038 #define ns_drop_tail_h 00039 00040 #include <string.h> 00041 #include "queue.h" 00042 #include "config.h" 00043 00044 /* 00045 * A bounded, drop-tail queue 00046 */ 00047 class DropTail : public Queue { 00048 public: 00049 DropTail() { 00050 q_ = new PacketQueue; 00051 pq_ = q_; 00052 bind_bool("drop_front_", &drop_front_); 00053 bind_bool("summarystats_", &summarystats); 00054 bind_bool("queue_in_bytes_", &qib_); // boolean: q in bytes? 00055 bind("mean_pktsize_", &mean_pktsize_); 00056 // _RENAMED("drop-front_", "drop_front_"); 00057 } 00058 ~DropTail() { 00059 delete q_; 00060 } 00061 protected: 00062 void reset(); 00063 int command(int argc, const char*const* argv); 00064 void enque(Packet*); 00065 Packet* deque(); 00066 void shrink_queue(); // To shrink queue and drop excessive packets. 00067 00068 PacketQueue *q_; /* underlying FIFO queue */ 00069 int drop_front_; /* drop-from-front (rather than from tail) */ 00070 int summarystats; 00071 void print_summarystats(); 00072 int qib_; /* bool: queue measured in bytes? */ 00073 int mean_pktsize_; /* configured mean packet size in bytes */ 00074 }; 00075 00076 #endif