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/*
* 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.
*/
/*
* The RubyEventQueue class implements an event queue which
* can be trigger events, allowing our simulation to be event driven.
*
* Currently, the only event we support is a Consumer being signaled
* by calling the consumer's wakeup() routine. Adding the event to
* the queue does not require a virtual function call, though calling
* wakeup() is a virtual function call.
*
* The method triggerEvents() is called with a global time. All
* events which are before or at this time are triggered in timestamp
* order. No ordering is enforced for events scheduled to occur at
* the same time. Events scheduled to wakeup the same consumer at the
* same time are combined into a single event.
*
* The method scheduleConsumerWakeup() is called with a global time
* and a consumer pointer. The event queue will call the wakeup()
* method of the consumer at the appropriate time.
*
* This implementation of RubyEventQueue uses a dynamically sized array
* managed as a heap. The algorithms used has O(lg n) for insert and
* O(lg n) for extract minimum element. (Based on chapter 7 of Cormen,
* Leiserson, and Rivest.) The array is dynamically sized and is
* automatically doubled in size when necessary.
*
*/
#ifndef __MEM_RUBY_EVENTQUEUE_RUBYEVENTQUEUE_HH__
#define __MEM_RUBY_EVENTQUEUE_RUBYEVENTQUEUE_HH__
#include <iostream>
#include "mem/ruby/common/TypeDefines.hh"
#include "sim/eventq.hh"
class Consumer;
class RubyEventQueueNode;
class RubyEventQueue : public EventManager
{
public:
RubyEventQueue(EventQueue* eventq, Tick _clock);
~RubyEventQueue();
Time getTime() const { return curTick()/m_clock; }
Tick getClock() const { return m_clock; }
void scheduleEvent(Consumer* consumer, Time timeDelta);
void scheduleEventAbsolute(Consumer* consumer, Time timeAbs);
void print(std::ostream& out) const;
private:
// Private copy constructor and assignment operator
RubyEventQueue(const RubyEventQueue& obj);
RubyEventQueue& operator=(const RubyEventQueue& obj);
// Data Members (m_ prefix)
Tick m_clock;
};
inline std::ostream&
operator<<(std::ostream& out, const RubyEventQueue& obj)
{
obj.print(out);
out << std::flush;
return out;
}
#endif // __MEM_RUBY_EVENTQUEUE_RUBYEVENTQUEUE_HH__
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