Simulator,Scheduler和时间

时间相关的成员定义

• Scheduler::EventKey

uint64_t m_ts;// Event time stamp.

DefaultSimulatorImpl::ventWithContext

uint64_t timestamp;

时间相关函数

• DefaultSimulatorImpl::DefaultSimulatorImpl
  m_currentTs = 0;
• DefaultSimulatorImpl::ProcessOneEvent
  记schudler中下一个事件为next.
  m_currentTs = next.key.m_ts;
• DefaultSimulatorImpl::ProcessEventsWithContext
  在eventsWithContext不空的时候，意义处理其中的每个事件。记每次取出的队首的事件为event.

Scheduler::Event ev;
ev.key.m_ts = m_currentTs + event.timestamp;//详见ScheduleWithContext函数的解释

• DefaultSimulatorImpl::Stop
  在距现在间隔time的时候停止simulator

DefaultSimulatorImpl::Stop (Time const &time)
{
  NS_LOG_FUNCTION (this << time.GetTimeStep ());
  Simulator::Schedule (time, &Simulator::Stop);
}

• DefaultSimulatorImpl::Schedule

EventId DefaultSimulatorImpl::Schedule (Time const &time, EventImpl *event)
{
  Time tAbsolute = time + TimeStep (m_currentTs);
  Scheduler::Event ev;
  ev.key.m_ts = (uint64_t) tAbsolute.GetTimeStep ();
}ScheduleWithContext

• DefaultSimulatorImpl::ScheduleWithContext
  从程序上看，应该是只有主线程才能把事件插入到schduler中。如果是在主线程中schedule带context的事件，操作和不带context的事件一样。如果是在非主线程中schedule带context的事件，那么只把事件存于m_eventsWithContext。也就导致了日后将m_eventsWithContext中的事件添加到scheduler队列中时，事件的绝对时间戳＝当前时间戳+ event.timestamp

void DefaultSimulatorImpl::ScheduleWithContext (uint32_t context, Time const &time, EventImpl *event)
{
  if (SystemThread::Equals (m_main)){
  Time tAbsolute = time + TimeStep (m_currentTs);
  Scheduler::Event ev;
  ev.key.m_ts = (uint64_t) tAbsolute.GetTimeStep ();
  }
  else｛
   EventWithContext ev;
   ev.timestamp = time.GetTimeStep ();
   创建临界区并把ev插入m_eventsWithContext中
  ｝
}

• DefaultSimulatorImpl::ScheduleNow

EventId　DefaultSimulatorImpl::ScheduleNow (EventImpl *event)
{
  ev.key.m_ts = m_currentTs;
 ｝