/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * 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;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */

#include <cassert>

#include "mem/ruby/common/Consumer.hh"
#include "mem/ruby/eventqueue/RubyEventQueue.hh"
#include "mem/ruby/eventqueue/RubyEventQueueNode.hh"
#include "mem/ruby/system/System.hh"

RubyEventQueue::RubyEventQueue(EventQueue* eventq, Tick _clock)
  : EventManager(eventq), m_clock(_clock)
{
}

RubyEventQueue::~RubyEventQueue()
{
}

void
RubyEventQueue::scheduleEvent(Consumer* consumer, Time timeDelta)
{
    scheduleEventAbsolute(consumer, timeDelta + getTime());
}

void
RubyEventQueue::scheduleEventAbsolute(Consumer* consumer, Time timeAbs)
{
    // Check to see if this is a redundant wakeup
    assert(consumer != NULL);
    if (!consumer->alreadyScheduled(timeAbs)) {
        // This wakeup is not redundant
        RubyEventQueueNode *thisNode = new RubyEventQueueNode(consumer, this);
        assert(timeAbs > getTime());
        schedule(thisNode, (timeAbs * m_clock));
        consumer->insertScheduledWakeupTime(timeAbs);
    }
}

void
RubyEventQueue::print(std::ostream& out) const
{
    out << "[Event Queue:]";
}