348 lines
7.6 KiB
C++
348 lines
7.6 KiB
C++
/* -*- 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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// 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_currentContext = 0xffffffff;
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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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void
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DefaultSimulatorImpl::DoDispose (void)
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{
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while (!m_events->IsEmpty ())
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{
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Scheduler::Event next = m_events->RemoveNext ();
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next.impl->Unref ();
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}
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m_events = 0;
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SimulatorImpl::DoDispose ();
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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 (ObjectFactory schedulerFactory)
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{
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Ptr<Scheduler> scheduler = schedulerFactory.Create<Scheduler> ();
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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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Scheduler::Event 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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void
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DefaultSimulatorImpl::ProcessOneEvent (void)
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{
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Scheduler::Event next = m_events->RemoveNext ();
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NS_ASSERT (next.key.m_ts >= m_currentTs);
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m_unscheduledEvents--;
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NS_LOG_LOGIC ("handle " << next.key.m_ts);
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m_currentTs = next.key.m_ts;
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m_currentContext = next.key.m_context;
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m_currentUid = next.key.m_uid;
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next.impl->Invoke ();
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next.impl->Unref ();
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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 () || m_stop;
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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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Scheduler::Event ev = m_events->PeekNext ();
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return ev.key.m_ts;
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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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m_stop = false;
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while (!m_events->IsEmpty () && !m_stop)
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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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}
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void
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DefaultSimulatorImpl::RunOneEvent (void)
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{
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ProcessOneEvent ();
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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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Simulator::Schedule (time, &Simulator::Stop);
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}
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//
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// Schedule an event for a _relative_ time in the future.
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//
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EventId
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DefaultSimulatorImpl::Schedule (Time const &time, EventImpl *event)
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{
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Time tAbsolute = time + TimeStep (m_currentTs);
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NS_ASSERT (tAbsolute.IsPositive ());
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NS_ASSERT (tAbsolute >= TimeStep (m_currentTs));
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Scheduler::Event ev;
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ev.impl = event;
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ev.key.m_ts = (uint64_t) tAbsolute.GetTimeStep ();
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ev.key.m_context = GetContext ();
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ev.key.m_uid = m_uid;
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m_uid++;
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m_unscheduledEvents++;
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m_events->Insert (ev);
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return EventId (event, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
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}
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void
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DefaultSimulatorImpl::ScheduleWithContext (uint32_t context, Time const &time, EventImpl *event)
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{
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NS_LOG_FUNCTION (this << context << time.GetTimeStep () << m_currentTs << event);
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Scheduler::Event ev;
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ev.impl = event;
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ev.key.m_ts = m_currentTs + time.GetTimeStep ();
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ev.key.m_context = context;
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ev.key.m_uid = m_uid;
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m_uid++;
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m_unscheduledEvents++;
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m_events->Insert (ev);
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}
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EventId
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DefaultSimulatorImpl::ScheduleNow (EventImpl *event)
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{
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Scheduler::Event ev;
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ev.impl = event;
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ev.key.m_ts = m_currentTs;
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ev.key.m_context = GetContext ();
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ev.key.m_uid = m_uid;
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m_uid++;
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m_unscheduledEvents++;
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m_events->Insert (ev);
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return EventId (event, ev.key.m_ts, ev.key.m_context, ev.key.m_uid);
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}
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EventId
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DefaultSimulatorImpl::ScheduleDestroy (EventImpl *event)
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{
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EventId id (Ptr<EventImpl> (event, false), m_currentTs, 0xffffffff, 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 &id)
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{
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if (id.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 == id)
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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 (id))
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{
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return;
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}
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Scheduler::Event event;
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event.impl = id.PeekEventImpl ();
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event.key.m_ts = id.GetTs ();
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event.key.m_context = id.GetContext ();
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event.key.m_uid = id.GetUid ();
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m_events->Remove (event);
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event.impl->Cancel ();
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// whenever we remove an event from the event list, we have to unref it.
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event.impl->Unref ();
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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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if (ev.PeekEventImpl () == 0 ||
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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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// 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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uint32_t
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DefaultSimulatorImpl::GetContext (void) const
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{
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return m_currentContext;
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}
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} // namespace ns3
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