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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.
*/
/*
* Unordered buffer of messages that can be inserted such
* that they can be dequeued after a given delta time has expired.
*/
#ifndef __MEM_RUBY_BUFFERS_MESSAGEBUFFER_HH__
#define __MEM_RUBY_BUFFERS_MESSAGEBUFFER_HH__
#include <iostream>
#include <string>
#include "mem/gems_common/PrioHeap.hh"
#include "mem/ruby/buffers/MessageBufferNode.hh"
#include "mem/ruby/common/Consumer.hh"
#include "mem/ruby/common/Global.hh"
#include "mem/ruby/eventqueue/RubyEventQueue.hh"
#include "mem/ruby/slicc_interface/Message.hh"
class MessageBuffer
{
public:
MessageBuffer(const std::string &name = "");
static void printConfig(std::ostream& out) {}
void
setRecycleLatency(int recycle_latency)
{
m_recycle_latency = recycle_latency;
}
// TRUE if head of queue timestamp <= SystemTime
bool
isReady() const
{
return ((m_prio_heap.size() > 0) &&
(m_prio_heap.peekMin().m_time <= g_eventQueue_ptr->getTime()));
}
void
delayHead()
{
MessageBufferNode node = m_prio_heap.extractMin();
enqueue(node.m_msgptr, 1);
}
bool areNSlotsAvailable(int n);
int getPriority() { return m_priority_rank; }
void setPriority(int rank) { m_priority_rank = rank; }
void setConsumer(Consumer* consumer_ptr)
{
ASSERT(m_consumer_ptr == NULL);
m_consumer_ptr = consumer_ptr;
}
void setDescription(const std::string& name) { m_name = name; }
std::string getDescription() { return m_name;}
Consumer* getConsumer() { return m_consumer_ptr; }
const Message* peekAtHeadOfQueue() const;
const Message* peek() const { return peekAtHeadOfQueue(); }
const MsgPtr getMsgPtrCopy() const;
const MsgPtr&
peekMsgPtr() const
{
assert(isReady());
return m_prio_heap.peekMin().m_msgptr;
}
const MsgPtr&
peekMsgPtrEvenIfNotReady() const
{
return m_prio_heap.peekMin().m_msgptr;
}
void enqueue(const MsgPtr& message) { enqueue(message, 1); }
void enqueue(const MsgPtr& message, Time delta);
// void enqueueAbsolute(const MsgPtr& message, Time absolute_time);
int dequeue_getDelayCycles(MsgPtr& message); // returns delay
// cycles of the
// message
void dequeue(MsgPtr& message);
int dequeue_getDelayCycles(); // returns delay cycles of the message
void dequeue() { pop(); }
void pop();
void recycle();
bool isEmpty() const { return m_prio_heap.size() == 0; }
void
setOrdering(bool order)
{
m_strict_fifo = order;
m_ordering_set = true;
}
void setSize(int size) { m_max_size = size; }
int getSize();
void setRandomization(bool random_flag) { m_randomization = random_flag; }
void clear();
void print(std::ostream& out) const;
void printStats(std::ostream& out);
void clearStats() { m_not_avail_count = 0; m_msg_counter = 0; }
private:
//added by SS
int m_recycle_latency;
// Private Methods
int setAndReturnDelayCycles(MsgPtr& message);
// Private copy constructor and assignment operator
MessageBuffer(const MessageBuffer& obj);
MessageBuffer& operator=(const MessageBuffer& obj);
// Data Members (m_ prefix)
Consumer* m_consumer_ptr; // Consumer to signal a wakeup(), can be NULL
PrioHeap<MessageBufferNode> m_prio_heap;
std::string m_name;
int m_max_size;
int m_size;
Time m_time_last_time_size_checked;
int m_size_last_time_size_checked;
// variables used so enqueues appear to happen imediately, while
// pop happen the next cycle
Time m_time_last_time_enqueue;
Time m_time_last_time_pop;
int m_size_at_cycle_start;
int m_msgs_this_cycle;
int m_not_avail_count; // count the # of times I didn't have N
// slots available
int m_msg_counter;
int m_priority_rank;
bool m_strict_fifo;
bool m_ordering_set;
bool m_randomization;
Time m_last_arrival_time;
};
inline std::ostream&
operator<<(std::ostream& out, const MessageBuffer& obj)
{
obj.print(out);
out << std::flush;
return out;
}
#endif // __MEM_RUBY_BUFFERS_MESSAGEBUFFER_HH__
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