src/simulator/default-simulator-impl.cc
author Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
Mon, 28 Jul 2008 08:54:20 -0700
changeset 3489 b5ef00370c70
parent 3470 21022872009d
child 3494 b198b3d06e86
permissions -rw-r--r--
bug 252: get rid of dead code.
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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 * Copyright (c) 2005,2006 INRIA
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation;
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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 */
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#include "simulator.h"
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#include "default-simulator-impl.h"
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#include "scheduler.h"
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#include "event-impl.h"
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#include "ns3/ptr.h"
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#include "ns3/pointer.h"
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#include "ns3/assert.h"
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#include "ns3/log.h"
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#include <math.h>
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NS_LOG_COMPONENT_DEFINE ("DefaultSimulatorImpl");
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namespace ns3 {
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NS_OBJECT_ENSURE_REGISTERED (DefaultSimulatorImpl);
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TypeId
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DefaultSimulatorImpl::GetTypeId (void)
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{
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  static TypeId tid = TypeId ("ns3::DefaultSimulatorImpl")
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    .SetParent<Object> ()
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    .AddConstructor<DefaultSimulatorImpl> ()
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    ;
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  return tid;
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}
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DefaultSimulatorImpl::DefaultSimulatorImpl ()
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{
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  m_stop = false;
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  m_stopAt = 0;
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  // uids are allocated from 4.
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  // uid 0 is "invalid" events
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  // uid 1 is "now" events
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  // uid 2 is "destroy" events
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  m_uid = 4; 
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  // before ::Run is entered, the m_currentUid will be zero
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  m_currentUid = 0;
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  m_currentTs = 0;
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  m_unscheduledEvents = 0;
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}
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DefaultSimulatorImpl::~DefaultSimulatorImpl ()
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{
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  while (!m_events->IsEmpty ())
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    {
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      EventId next = m_events->RemoveNext ();
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    }
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  m_events = 0;
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}
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void
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DefaultSimulatorImpl::Destroy ()
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{
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  while (!m_destroyEvents.empty ()) 
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    {
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      Ptr<EventImpl> ev = m_destroyEvents.front ().PeekEventImpl ();
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      m_destroyEvents.pop_front ();
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      NS_LOG_LOGIC ("handle destroy " << ev);
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      if (!ev->IsCancelled ())
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        {
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          ev->Invoke ();
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        }
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    }
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}
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void
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DefaultSimulatorImpl::SetScheduler (Ptr<Scheduler> scheduler)
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{
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  if (m_events != 0)
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    {
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      while (!m_events->IsEmpty ())
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        {
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          EventId next = m_events->RemoveNext ();
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          scheduler->Insert (next);
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        }
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    }
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  m_events = scheduler;
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}
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Ptr<Scheduler>
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DefaultSimulatorImpl::GetScheduler (void) const
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{
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  return m_events;
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}
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void
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DefaultSimulatorImpl::ProcessOneEvent (void)
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{
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  EventId next = m_events->RemoveNext ();
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  NS_ASSERT (next.GetTs () >= m_currentTs);
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  --m_unscheduledEvents;
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  NS_LOG_LOGIC ("handle " << next.GetTs ());
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  m_currentTs = next.GetTs ();
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  m_currentUid = next.GetUid ();
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  EventImpl *event = next.PeekEventImpl ();
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  event->Invoke ();
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}
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bool 
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DefaultSimulatorImpl::IsFinished (void) const
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{
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  return m_events->IsEmpty ();
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}
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uint64_t
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DefaultSimulatorImpl::NextTs (void) const
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{
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  NS_ASSERT (!m_events->IsEmpty ());
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  EventId id = m_events->PeekNext ();
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  return id.GetTs ();
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}
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Time
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DefaultSimulatorImpl::Next (void) const
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{
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  return TimeStep (NextTs ());
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}
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void
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DefaultSimulatorImpl::Run (void)
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{
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  while (!m_events->IsEmpty () && !m_stop && 
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         (m_stopAt == 0 || m_stopAt > NextTs ())) 
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    {
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      ProcessOneEvent ();
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    }
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  // If the simulator stopped naturally by lack of events, make a
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  // consistency test to check that we didn't lose any events along the way.
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  NS_ASSERT(!m_events->IsEmpty () || m_unscheduledEvents == 0);
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  m_log.close ();
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}
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void 
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DefaultSimulatorImpl::Stop (void)
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{
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  m_stop = true;
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}
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void 
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DefaultSimulatorImpl::Stop (Time const &time)
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{
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  NS_ASSERT (time.IsPositive ());
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  Time absolute = Simulator::Now () + time;
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  m_stopAt = absolute.GetTimeStep ();
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}
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EventId
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DefaultSimulatorImpl::Schedule (Time const &time, const Ptr<EventImpl> &event)
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{
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  NS_ASSERT (time.IsPositive ());
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  NS_ASSERT (time >= TimeStep (m_currentTs));
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  uint64_t ts = (uint64_t) time.GetTimeStep ();
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  EventId id (event, ts, m_uid);
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  m_uid++;
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  ++m_unscheduledEvents;
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  m_events->Insert (id);
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  return id;
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}
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EventId
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DefaultSimulatorImpl::ScheduleNow (const Ptr<EventImpl> &event)
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{
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  EventId id (event, m_currentTs, m_uid);
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  m_uid++;
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  ++m_unscheduledEvents;
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  m_events->Insert (id);
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  return id;
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}
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EventId
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DefaultSimulatorImpl::ScheduleDestroy (const Ptr<EventImpl> &event)
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{
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  EventId id (event, m_currentTs, 2);
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  m_destroyEvents.push_back (id);
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  m_uid++;
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  return id;
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}
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Time
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DefaultSimulatorImpl::Now (void) const
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{
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  return TimeStep (m_currentTs);
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}
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Time 
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DefaultSimulatorImpl::GetDelayLeft (const EventId &id) const
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{
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  if (IsExpired (id))
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    {
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      return TimeStep (0);
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    }
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  else
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    {
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      return TimeStep (id.GetTs () - m_currentTs);
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    }
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}
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void
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DefaultSimulatorImpl::Remove (const EventId &ev)
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{
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  if (ev.GetUid () == 2)
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    {
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      // destroy events.
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      for (DestroyEvents::iterator i = m_destroyEvents.begin (); i != m_destroyEvents.end (); i++)
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        {
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          if (*i == ev)
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            {
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              m_destroyEvents.erase (i);
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              break;
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            }
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         }
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      return;
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    }
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  if (IsExpired (ev))
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    {
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      return;
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    }
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  m_events->Remove (ev);
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  Cancel (ev);
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  --m_unscheduledEvents;
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}
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void
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DefaultSimulatorImpl::Cancel (const EventId &id)
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{
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  if (!IsExpired (id))
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    {
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      id.PeekEventImpl ()->Cancel ();
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    }
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}
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bool
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DefaultSimulatorImpl::IsExpired (const EventId &ev) const
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{
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  if (ev.GetUid () == 2)
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    {
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      // destroy events.
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      for (DestroyEvents::const_iterator i = m_destroyEvents.begin (); i != m_destroyEvents.end (); i++)
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        {
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          if (*i == ev)
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            {
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              return false;
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            }
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         }
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      return true;
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    }
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  if (ev.PeekEventImpl () == 0 ||
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      ev.GetTs () < m_currentTs ||
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      (ev.GetTs () == m_currentTs &&
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       ev.GetUid () <= m_currentUid) ||
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      ev.PeekEventImpl ()->IsCancelled ()) 
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    {
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      return true;
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    }
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  else
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    {
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      return false;
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    }
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}
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Time 
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DefaultSimulatorImpl::GetMaximumSimulationTime (void) const
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{
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  // XXX: I am fairly certain other compilers use other non-standard
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  // post-fixes to indicate 64 bit constants.
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  return TimeStep (0x7fffffffffffffffLL);
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}
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}; // namespace ns3
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