gem5/sim/eventq.cc
Ali Saidi 2f316082e4 Updated Copyright with information in bitkeeper changelogs
arch/alpha/alpha_linux_process.cc:
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    Updated Copyright
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    This code isn't ours, and shouldn't have our copyright

--HG--
extra : convert_revision : 598f2e5eab5d5d3de2c1e862b389086e3212f7c4
2004-06-08 13:37:27 -04:00

250 lines
6.5 KiB
C++

/*
* Copyright (c) 2000-2003 The Regents of The University of Michigan
* 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 <assert.h>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include "cpu/full_cpu/smt.hh"
#include "base/misc.hh"
#include "sim/eventq.hh"
#include "base/trace.hh"
#include "sim/universe.hh"
using namespace std;
//
// Main Event Queue
//
// Events on this queue are processed at the *beginning* of each
// cycle, before the pipeline simulation is performed.
//
EventQueue mainEventQueue("MainEventQueue");
void
EventQueue::insert(Event *event)
{
if (head == NULL || event->when() < head->when() ||
(event->when() == head->when() &&
event->priority() <= head->priority())) {
event->next = head;
head = event;
} else {
Event *prev = head;
Event *curr = head->next;
while (curr) {
if (event->when() <= curr->when() &&
(event->when() < curr->when() ||
event->priority() <= curr->priority()))
break;
prev = curr;
curr = curr->next;
}
event->next = curr;
prev->next = event;
}
}
void
EventQueue::remove(Event *event)
{
if (head == NULL)
return;
if (head == event){
head = event->next;
return;
}
Event *prev = head;
Event *curr = head->next;
while (curr && curr != event) {
prev = curr;
curr = curr->next;
}
if (curr == event)
prev->next = curr->next;
}
void
EventQueue::serviceOne()
{
Event *event = head;
event->clearFlags(Event::Scheduled);
head = event->next;
// handle action
if (!event->squashed())
event->process();
else
event->clearFlags(Event::Squashed);
if (event->getFlags(Event::AutoDelete) && !event->scheduled())
delete event;
}
void
Event::serialize(std::ostream &os)
{
SERIALIZE_SCALAR(_when);
SERIALIZE_SCALAR(_priority);
SERIALIZE_ENUM(_flags);
}
void
Event::unserialize(Checkpoint *cp, const string &section)
{
if (scheduled())
deschedule();
UNSERIALIZE_SCALAR(_when);
UNSERIALIZE_SCALAR(_priority);
// need to see if original event was in a scheduled, unsquashed
// state, but don't want to restore those flags in the current
// object itself (since they aren't immediately true)
UNSERIALIZE_ENUM(_flags);
bool wasScheduled = (_flags & Scheduled) && !(_flags & Squashed);
_flags &= ~(Squashed | Scheduled);
if (wasScheduled) {
DPRINTF(Config, "rescheduling at %d\n", _when);
schedule(_when);
}
}
void
EventQueue::serialize(ostream &os)
{
std::list<Event *> eventPtrs;
int numEvents = 0;
Event *event = head;
while (event) {
if (event->getFlags(Event::AutoSerialize)) {
eventPtrs.push_back(event);
paramOut(os, csprintf("event%d", numEvents++), event->name());
}
event = event->next;
}
SERIALIZE_SCALAR(numEvents);
for (std::list<Event *>::iterator it=eventPtrs.begin();
it != eventPtrs.end(); ++it) {
(*it)->nameOut(os);
(*it)->serialize(os);
}
}
void
EventQueue::unserialize(Checkpoint *cp, const std::string &section)
{
int numEvents;
UNSERIALIZE_SCALAR(numEvents);
std::string eventName;
for (int i = 0; i < numEvents; i++) {
// get the pointer value associated with the event
paramIn(cp, section, csprintf("event%d", i), eventName);
// create the event based on its pointer value
Serializable::create(cp, eventName);
}
}
void
EventQueue::dump()
{
cprintf("============================================================\n");
cprintf("EventQueue Dump (cycle %d)\n", curTick);
cprintf("------------------------------------------------------------\n");
if (empty())
cprintf("<No Events>\n");
else {
Event *event = head;
while (event) {
event->dump();
event = event->next;
}
}
cprintf("============================================================\n");
}
const char *
Event::description()
{
return "generic";
}
#if TRACING_ON
void
Event::trace(const char *action)
{
// This DPRINTF is unconditional because calls to this function
// are protected by an 'if (DTRACE(Event))' in the inlined Event
// methods.
//
// This is just a default implementation for derived classes where
// it's not worth doing anything special. If you want to put a
// more informative message in the trace, override this method on
// the particular subclass where you have the information that
// needs to be printed.
DPRINTFN("%s event %s @ %d\n", description(), action, when());
}
#endif
void
Event::dump()
{
#if TRACING_ON
cprintf(" Created: %d\n", when_created);
#endif
if (scheduled()) {
#if TRACING_ON
cprintf(" Scheduled at %d\n", when_scheduled);
#endif
cprintf(" Scheduled for %d\n", when());
}
else {
cprintf(" Not Scheduled\n");
}
}