mac-timers.cc
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- /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
- /*
- * Copyright (c) 1997 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.
- */
- /* Ported from CMU/Monarch's code, nov'98 -Padma.*/
- #include <delay.h>
- #include <connector.h>
- #include <packet.h>
- #include <random.h>
-
- // #define DEBUG
- //#include <debug.h>
- #include <arp.h>
- #include <ll.h>
- #include <mac.h>
- #include <mac-timers.h>
- #include <mac-802_11.h>
- /*
- * Force timers to expire on slottime boundries.
- */
- // #define USE_SLOT_TIME
- #define ROUND_TIME()
- {
- assert(slottime);
- double rmd = remainder(s.clock() + rtime, slottime);
- if(rmd > 0.0)
- rtime += (slottime - rmd);
- else
- rtime += (-rmd);
- }
- /* ======================================================================
- Timers
- ====================================================================== */
- void
- MacTimer::start(double time)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ == 0);
- busy_ = 1;
- paused_ = 0;
- stime = s.clock();
- rtime = time;
- assert(rtime >= 0.0);
- s.schedule(this, &intr, rtime);
- }
- void
- MacTimer::stop(void)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_);
- if(paused_ == 0)
- s.cancel(&intr);
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- }
- /* ======================================================================
- Defer Timer
- ====================================================================== */
- void
- DeferTimer::start(double time)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ == 0);
- busy_ = 1;
- paused_ = 0;
- stime = s.clock();
- rtime = time;
- #ifdef USE_SLOT_TIME
- ROUND_TIME();
- #endif
- assert(rtime >= 0.0);
- s.schedule(this, &intr, rtime);
- }
- void
- DeferTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->deferHandler();
- }
- /* ======================================================================
- NAV Timer
- ====================================================================== */
- void
- NavTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->navHandler();
- }
- //JUNGMIN
- /* ======================================================================
- Wait Timer
- ====================================================================== */
- void
- WaitTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->waitHandler();
- }
- /* ======================================================================
- Channel Usage Timer
- ====================================================================== */
- void
- ChannelUsageTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->channelusageHandler(mychannel);
- }
- void
- ChannelUsageTimer::AssignChannel(int ch)
- {
- mychannel = ch;
- }
- /* ======================================================================
- ATIM Window Timer
- ====================================================================== */
- void
- ATIMWindowTimer::start(double time)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ == 0);
- busy_ = 1;
- paused_ = 0;
- stime = s.clock();
- rtime = time;
- assert(rtime >= 0.0);
- s.schedule(this, &intr, rtime);
- }
- void
- ATIMWindowTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->atimHandler();
- }
- //end of JUNGMIN
- /* ======================================================================
- Receive Timer
- ====================================================================== */
- void
- RxTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->recvHandler();
- }
- //JUNGMIN
- /* ======================================================================
- Receive Data Timer
- ====================================================================== */
- void
- RxDATATimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->recvDATAHandler();
- }
- /* ======================================================================
- Send Timer
- ====================================================================== */
- void
- TxTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->sendHandler();
- }
- //end of JUNGMIN
- /* ======================================================================
- Interface Timer
- ====================================================================== */
- void
- IFTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->txHandler();
- }
- /* ======================================================================
- Backoff Timer
- ====================================================================== */
- void
- BackoffTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- difs_wait = 0.0;
- mac->backoffHandler();
- }
- void
- BackoffTimer::start(int cw, int idle)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ == 0);
- busy_ = 1;
- paused_ = 0;
- stime = s.clock();
-
- rtime = (Random::random() % cw) * mac->phymib_->SlotTime;
- #ifdef USE_SLOT_TIME
- ROUND_TIME();
- #endif
- difs_wait = 0.0;
- if(idle == 0)
- paused_ = 1;
- else {
- assert(rtime >= 0.0);
- s.schedule(this, &intr, rtime);
- }
- }
- void
- BackoffTimer::pause()
- {
- Scheduler &s = Scheduler::instance();
- //the caculation below make validation pass for linux though it
- // looks dummy
- double st = s.clock();
- double rt = stime + difs_wait;
- double sr = st - rt;
- double mst = (mac->phymib_->SlotTime);
- int slots = int (sr/mst);
- //int slots = (int) ((s.clock() - (stime + difs_wait)) / mac->phymib_->SlotTime);
- if(slots < 0)
- slots = 0;
- assert(busy_ && ! paused_);
- paused_ = 1;
- rtime -= (slots * mac->phymib_->SlotTime);
- assert(rtime >= 0.0);
- difs_wait = 0.0;
- s.cancel(&intr);
- }
- void
- BackoffTimer::resume(double difs)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ && paused_);
- paused_ = 0;
- stime = s.clock();
- /*
- * The media should be idle for DIFS time before we start
- * decrementing the counter, so I add difs time in here.
- */
- difs_wait = difs;
- /*
- #ifdef USE_SLOT_TIME
- ROUND_TIME();
- #endif
- */
- assert(rtime + difs_wait >= 0.0);
- s.schedule(this, &intr, rtime + difs_wait);
- }
- //JUNGMIN
- /* ======================================================================
- Beacon Timer
- ====================================================================== */
- void
- BeaconTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->beaconHandler();
- }
- /* ======================================================================
- Beacon Backoff Timer
- ====================================================================== */
- void
- BeaconBackoffTimer::start(int bcw)
- {
- Scheduler &s = Scheduler::instance();
- assert(busy_ == 0);
- busy_ = 1;
- paused_ = 0;
- stime = s.clock();
- rtime = (Random::random() % bcw) * mac->phymib_->SlotTime;
- #ifdef USE_SLOT_TIME
- ROUND_TIME();
- #endif
- assert(rtime >= 0.0);
- s.schedule(this, &intr, rtime);
- }
-
- void
- BeaconBackoffTimer::handle(Event *)
- {
- busy_ = 0;
- paused_ = 0;
- stime = 0.0;
- rtime = 0.0;
- mac->beaconBackoffHandler();
- }
- //end of JUNGMIN