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authorNathan Binkert <nate@binkert.org>2008-10-09 04:58:23 -0700
committerNathan Binkert <nate@binkert.org>2008-10-09 04:58:23 -0700
commit8291d9db0a0bdeecb2a13f28962893ed3659230e (patch)
treeccd4df59a41cd3d8e4ac35adc591315f44425479 /src/sim/eventq.hh
parent68c75c589b2e006292f623bd6428754d7d590f01 (diff)
downloadgem5-8291d9db0a0bdeecb2a13f28962893ed3659230e.tar.xz
eventq: Major API change for the Event and EventQueue structures.
Since the early days of M5, an event needed to know which event queue it was on, and that data was required at the time of construction of the event object. In the future parallelized M5, this sort of requirement does not work well since the proper event queue will not always be known at the time of construction of an event. Now, events are created, and the EventQueue itself has the schedule function, e.g. eventq->schedule(event, when). To simplify the syntax, I created a class called EventManager which holds a pointer to an EventQueue and provides the schedule interface that is a proxy for the EventQueue. The intent is that objects that frequently schedule events can be derived from EventManager and then they have the schedule interface. SimObject and Port are examples of objects that will become EventManagers. The end result is that any SimObject can just call schedule(event, when) and it will just call that SimObject's eventq->schedule function. Of course, some objects may have more than one EventQueue, so this interface might not be perfect for those, but they should be relatively few.
Diffstat (limited to 'src/sim/eventq.hh')
-rw-r--r--src/sim/eventq.hh304
1 files changed, 153 insertions, 151 deletions
diff --git a/src/sim/eventq.hh b/src/sim/eventq.hh
index e0194a742..2db652b54 100644
--- a/src/sim/eventq.hh
+++ b/src/sim/eventq.hh
@@ -51,16 +51,6 @@
class EventQueue; // forward declaration
-//////////////////////
-//
-// Main Event Queue
-//
-// Events on this queue are processed at the *beginning* of each
-// cycle, before the pipeline simulation is performed.
-//
-// defined in eventq.cc
-//
-//////////////////////
extern EventQueue mainEventQueue;
/*
@@ -90,10 +80,6 @@ class Event : public Serializable, public FastAlloc
static Event *insertBefore(Event *event, Event *curr);
static Event *removeItem(Event *event, Event *last);
- /// queue to which this event belongs (though it may or may not be
- /// scheduled on this queue yet)
- EventQueue *_queue;
-
Tick _when; //!< timestamp when event should be processed
short _priority; //!< event priority
short _flags;
@@ -107,6 +93,10 @@ class Event : public Serializable, public FastAlloc
/// more difficult. Thus we use a global counter value when
/// debugging.
Counter instance;
+
+ /// queue to which this event belongs (though it may or may not be
+ /// scheduled on this queue yet)
+ EventQueue *queue;
#endif
#ifdef EVENTQ_DEBUG
@@ -114,11 +104,13 @@ class Event : public Serializable, public FastAlloc
Tick whenScheduled; //!< time scheduled
#endif
- protected:
void
- setWhen(Tick when)
+ setWhen(Tick when, EventQueue *q)
{
_when = when;
+#ifndef NDEBUG
+ queue = q;
+#endif
#ifdef EVENTQ_DEBUG
whenScheduled = curTick;
#endif
@@ -131,7 +123,8 @@ class Event : public Serializable, public FastAlloc
Scheduled = 0x2,
AutoDelete = 0x4,
AutoSerialize = 0x8,
- IsExitEvent = 0x10
+ IsExitEvent = 0x10,
+ IsMainQueue = 0x20
};
bool getFlags(Flags f) const { return (_flags & f) == f; }
@@ -139,8 +132,6 @@ class Event : public Serializable, public FastAlloc
void clearFlags(Flags f) { _flags &= ~f; }
protected:
- EventQueue *queue() const { return _queue; }
-
// This function isn't really useful if TRACING_ON is not defined
virtual void trace(const char *action); //!< trace event activity
@@ -205,11 +196,12 @@ class Event : public Serializable, public FastAlloc
* Event constructor
* @param queue that the event gets scheduled on
*/
- Event(EventQueue *q, Priority p = Default_Pri)
- : nextBin(NULL), nextInBin(NULL), _queue(q), _priority(p), _flags(None)
+ Event(Priority p = Default_Pri)
+ : nextBin(NULL), nextInBin(NULL), _priority(p), _flags(None)
{
#ifndef NDEBUG
instance = ++instanceCounter;
+ queue = NULL;
#endif
#ifdef EVENTQ_DEBUG
whenCreated = curTick;
@@ -256,16 +248,6 @@ class Event : public Serializable, public FastAlloc
/// Determine if the current event is scheduled
bool scheduled() const { return getFlags(Scheduled); }
- /// Schedule the event with the current priority or default priority
- void schedule(Tick t);
-
- /// Reschedule the event with the current priority
- // always parameter means to schedule if not already scheduled
- void reschedule(Tick t, bool always = false);
-
- /// Remove the event from the current schedule
- void deschedule();
-
/// Squash the current event
void squash() { setFlags(Squashed); }
@@ -281,6 +263,7 @@ class Event : public Serializable, public FastAlloc
/// Get the event priority
int priority() const { return _priority; }
+#ifndef SWIG
struct priority_compare
: public std::binary_function<Event *, Event *, bool>
{
@@ -293,55 +276,7 @@ class Event : public Serializable, public FastAlloc
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
-};
-
-template <class T, void (T::* F)()>
-void
-DelayFunction(Tick when, T *object)
-{
- class DelayEvent : public Event
- {
- private:
- T *object;
-
- public:
- DelayEvent(Tick when, T *o)
- : Event(&mainEventQueue), object(o)
- { setFlags(this->AutoDestroy); schedule(when); }
- void process() { (object->*F)(); }
- const char *description() const { return "delay"; }
- };
-
- new DelayEvent(when, object);
-}
-
-template <class T, void (T::* F)()>
-class EventWrapper : public Event
-{
- private:
- T *object;
-
- public:
- EventWrapper(T *obj, bool del = false,
- EventQueue *q = &mainEventQueue,
- Priority p = Default_Pri)
- : Event(q, p), object(obj)
- {
- if (del)
- setFlags(AutoDelete);
- }
-
- EventWrapper(T *obj, Tick t, bool del = false,
- EventQueue *q = &mainEventQueue,
- Priority p = Default_Pri)
- : Event(q, p), object(obj)
- {
- if (del)
- setFlags(AutoDelete);
- schedule(t);
- }
-
- void process() { (object->*F)(); }
+#endif
};
/*
@@ -349,18 +284,14 @@ class EventWrapper : public Event
*/
class EventQueue : public Serializable
{
- protected:
- std::string objName;
-
private:
+ std::string objName;
Event *head;
void insert(Event *event);
void remove(Event *event);
public:
-
- // constructor
EventQueue(const std::string &n)
: objName(n), head(NULL)
{}
@@ -370,7 +301,7 @@ class EventQueue : public Serializable
// schedule the given event on this queue
void schedule(Event *ev, Tick when);
void deschedule(Event *ev);
- void reschedule(Event *ev, Tick when);
+ void reschedule(Event *ev, Tick when, bool always = false);
Tick nextTick() const { return head->when(); }
Event *serviceOne();
@@ -406,83 +337,103 @@ class EventQueue : public Serializable
bool debugVerify() const;
+#ifndef SWIG
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
+#endif
};
+#ifndef SWIG
+class EventManager
+{
+ protected:
+ /** A pointer to this object's event queue */
+ EventQueue *eventq;
-//////////////////////
-//
-// inline functions
-//
-// can't put these inside declaration due to circular dependence
-// between Event and EventQueue classes.
-//
-//////////////////////
+ public:
+ EventManager(EventManager &em) : eventq(em.queue()) {}
+ EventManager(EventManager *em) : eventq(em ? em->queue() : NULL) {}
+ EventManager(EventQueue *eq) : eventq(eq) {}
-// schedule at specified time (place on event queue specified via
-// constructor)
-inline void
-Event::schedule(Tick when)
-{
- _queue->schedule(this, when);
-}
+ EventQueue *
+ queue() const
+ {
+ return eventq;
+ }
-inline void
-Event::deschedule()
-{
- _queue->deschedule(this);
-}
+ void
+ schedule(Event &event, Tick when)
+ {
+ eventq->schedule(&event, when);
+ }
-inline void
-Event::reschedule(Tick when, bool always)
-{
- if (scheduled()) {
- _queue->reschedule(this, when);
- } else {
- assert(always);
- _queue->schedule(this, when);
+ void
+ deschedule(Event &event)
+ {
+ eventq->deschedule(&event);
}
-}
-inline bool
-operator<(const Event &l, const Event &r)
-{
- return l.when() < r.when() ||
- (l.when() == r.when() && l.priority() < r.priority());
-}
+ void
+ reschedule(Event &event, Tick when, bool always = false)
+ {
+ eventq->reschedule(&event, when, always);
+ }
-inline bool
-operator>(const Event &l, const Event &r)
-{
- return l.when() > r.when() ||
- (l.when() == r.when() && l.priority() > r.priority());
-}
+ void
+ schedule(Event *event, Tick when)
+ {
+ eventq->schedule(event, when);
+ }
-inline bool
-operator<=(const Event &l, const Event &r)
-{
- return l.when() < r.when() ||
- (l.when() == r.when() && l.priority() <= r.priority());
-}
-inline bool
-operator>=(const Event &l, const Event &r)
-{
- return l.when() > r.when() ||
- (l.when() == r.when() && l.priority() >= r.priority());
-}
+ void
+ deschedule(Event *event)
+ {
+ eventq->deschedule(event);
+ }
-inline bool
-operator==(const Event &l, const Event &r)
+ void
+ reschedule(Event *event, Tick when, bool always = false)
+ {
+ eventq->reschedule(event, when, always);
+ }
+};
+
+template <class T, void (T::* F)()>
+void
+DelayFunction(EventQueue *eventq, Tick when, T *object)
{
- return l.when() == r.when() && l.priority() == r.priority();
+ class DelayEvent : public Event
+ {
+ private:
+ T *object;
+
+ public:
+ DelayEvent(T *o)
+ : object(o)
+ { setFlags(this->AutoDestroy); }
+ void process() { (object->*F)(); }
+ const char *description() const { return "delay"; }
+ };
+
+ eventq->schedule(new DelayEvent(object), when);
}
-inline bool
-operator!=(const Event &l, const Event &r)
+template <class T, void (T::* F)()>
+class EventWrapper : public Event
{
- return l.when() != r.when() || l.priority() != r.priority();
-}
+ private:
+ T *object;
+
+ public:
+ EventWrapper(T *obj, bool del = false, Priority p = Default_Pri)
+ : Event(p), object(obj)
+ {
+ if (del)
+ setFlags(AutoDelete);
+ }
+
+ void process() { (object->*F)(); }
+};
inline void
EventQueue::schedule(Event *event, Tick when)
@@ -490,9 +441,13 @@ EventQueue::schedule(Event *event, Tick when)
assert(when >= curTick);
assert(!event->scheduled());
- event->setWhen(when);
+ event->setWhen(when, this);
insert(event);
event->setFlags(Event::Scheduled);
+ if (this == &mainEventQueue)
+ event->setFlags(Event::IsMainQueue);
+ else
+ event->clearFlags(Event::IsMainQueue);
if (DTRACE(Event))
event->trace("scheduled");
@@ -516,18 +471,65 @@ EventQueue::deschedule(Event *event)
}
inline void
-EventQueue::reschedule(Event *event, Tick when)
+EventQueue::reschedule(Event *event, Tick when, bool always)
{
assert(when >= curTick);
- assert(event->scheduled());
+ assert(always || event->scheduled());
- remove(event);
- event->setWhen(when);
+ if (event->scheduled())
+ remove(event);
+
+ event->setWhen(when, this);
insert(event);
event->clearFlags(Event::Squashed);
+ event->setFlags(Event::Scheduled);
+ if (this == &mainEventQueue)
+ event->setFlags(Event::IsMainQueue);
+ else
+ event->clearFlags(Event::IsMainQueue);
if (DTRACE(Event))
event->trace("rescheduled");
}
+inline bool
+operator<(const Event &l, const Event &r)
+{
+ return l.when() < r.when() ||
+ (l.when() == r.when() && l.priority() < r.priority());
+}
+
+inline bool
+operator>(const Event &l, const Event &r)
+{
+ return l.when() > r.when() ||
+ (l.when() == r.when() && l.priority() > r.priority());
+}
+
+inline bool
+operator<=(const Event &l, const Event &r)
+{
+ return l.when() < r.when() ||
+ (l.when() == r.when() && l.priority() <= r.priority());
+}
+inline bool
+operator>=(const Event &l, const Event &r)
+{
+ return l.when() > r.when() ||
+ (l.when() == r.when() && l.priority() >= r.priority());
+}
+
+inline bool
+operator==(const Event &l, const Event &r)
+{
+ return l.when() == r.when() && l.priority() == r.priority();
+}
+
+inline bool
+operator!=(const Event &l, const Event &r)
+{
+ return l.when() != r.when() || l.priority() != r.priority();
+}
+#endif
+
#endif // __SIM_EVENTQ_HH__