Consumer.cc

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 * Copyright (c) 2012 Mark D. Hill and David A. Wood
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#include "mem/ruby/common/Consumer.hh"
 
namespace gem5
{
 
namespace ruby
{
 
Consumer::Consumer(ClockedObject *_em)
    : m_wakeup_event([this]{ processCurrentEvent(); },
                    "Consumer Event", false),
      em(_em)
{ }
 
void
Consumer::scheduleEvent(Cycles timeDelta)
{
    m_wakeup_ticks.insert(em->clockEdge(timeDelta));
    scheduleNextWakeup();
}
 
void
Consumer::scheduleEventAbsolute(Tick evt_time)
{
    m_wakeup_ticks.insert(
        divCeil(evt_time, em->clockPeriod()) * em->clockPeriod());
    scheduleNextWakeup();
}
 
void
Consumer::scheduleNextWakeup()
{
    // look for the next tick in the future to schedule
    auto it = m_wakeup_ticks.lower_bound(em->clockEdge());
    if (it != m_wakeup_ticks.end()) {
        Tick when = *it;
        assert(when >= em->clockEdge());
        if (m_wakeup_event.scheduled() && (when < m_wakeup_event.when()))
            em->reschedule(m_wakeup_event, when, true);
        else if (!m_wakeup_event.scheduled())
            em->schedule(m_wakeup_event, when);
    }
}
 
void
Consumer::processCurrentEvent()
{
    auto curr = m_wakeup_ticks.begin();
    assert(em->clockEdge() == *curr);
 
    // remove the current tick from the wakeup list, wake up, and then schedule
    // the next wakeup
    m_wakeup_ticks.erase(curr);
    wakeup();
    scheduleNextWakeup();
}
 
} // namespace ruby
} // namespace gem5