578 lines
16 KiB
C++
578 lines
16 KiB
C++
/*
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* Copyright (c) 2000-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Steve Reinhardt
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* Nathan Binkert
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*/
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/* @file
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* EventQueue interfaces
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*/
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#ifndef __SIM_EVENTQ_HH__
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#define __SIM_EVENTQ_HH__
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#include <algorithm>
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#include <cassert>
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#include <climits>
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#include <map>
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#include <string>
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#include <vector>
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#include "base/fast_alloc.hh"
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#include "base/flags.hh"
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#include "base/misc.hh"
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#include "base/trace.hh"
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#include "base/types.hh"
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#include "sim/serialize.hh"
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class EventQueue; // forward declaration
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extern EventQueue mainEventQueue;
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/*
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* An item on an event queue. The action caused by a given
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* event is specified by deriving a subclass and overriding the
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* process() member function.
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*
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* Caution, the order of members is chosen to maximize data packing.
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*/
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class Event : public Serializable, public FastAlloc
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{
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friend class EventQueue;
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protected:
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typedef short FlagsType;
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typedef ::Flags<FlagsType> Flags;
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static const FlagsType PublicRead = 0x003f;
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static const FlagsType PublicWrite = 0x001d;
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static const FlagsType Squashed = 0x0001;
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static const FlagsType Scheduled = 0x0002;
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static const FlagsType AutoDelete = 0x0004;
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static const FlagsType AutoSerialize = 0x0008;
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static const FlagsType IsExitEvent = 0x0010;
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static const FlagsType IsMainQueue = 0x0020;
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#ifdef EVENTQ_DEBUG
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static const FlagsType Initialized = 0xf000;
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#endif
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private:
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// The event queue is now a linked list of linked lists. The
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// 'nextBin' pointer is to find the bin, where a bin is defined as
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// when+priority. All events in the same bin will be stored in a
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// second linked list (a stack) maintained by the 'nextInBin'
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// pointer. The list will be accessed in LIFO order. The end
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// result is that the insert/removal in 'nextBin' is
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// linear/constant, and the lookup/removal in 'nextInBin' is
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// constant/constant. Hopefully this is a significant improvement
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// over the current fully linear insertion.
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Event *nextBin;
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Event *nextInBin;
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static Event *insertBefore(Event *event, Event *curr);
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static Event *removeItem(Event *event, Event *last);
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Tick _when; //!< timestamp when event should be processed
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short _priority; //!< event priority
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Flags flags;
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#ifndef NDEBUG
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/// Global counter to generate unique IDs for Event instances
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static Counter instanceCounter;
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/// This event's unique ID. We can also use pointer values for
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/// this but they're not consistent across runs making debugging
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/// more difficult. Thus we use a global counter value when
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/// debugging.
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Counter instance;
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/// queue to which this event belongs (though it may or may not be
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/// scheduled on this queue yet)
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EventQueue *queue;
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#endif
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#ifdef EVENTQ_DEBUG
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Tick whenCreated; //!< time created
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Tick whenScheduled; //!< time scheduled
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#endif
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void
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setWhen(Tick when, EventQueue *q)
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{
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_when = when;
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#ifndef NDEBUG
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queue = q;
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#endif
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#ifdef EVENTQ_DEBUG
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whenScheduled = curTick;
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#endif
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}
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protected:
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/// Accessor for flags.
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Flags
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getFlags() const
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{
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return flags & PublicRead;
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}
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Flags
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getFlags(Flags _flags) const
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{
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assert(flags.noneSet(~PublicRead));
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return flags.isSet(_flags);
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}
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Flags
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allFlags(Flags _flags) const
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{
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assert(_flags.noneSet(~PublicRead));
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return flags.allSet(_flags);
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}
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/// Accessor for flags.
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void
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setFlags(Flags _flags)
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{
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assert(_flags.noneSet(~PublicWrite));
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flags.set(_flags);
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}
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void
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clearFlags(Flags _flags)
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{
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assert(_flags.noneSet(~PublicWrite));
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flags.clear(_flags);
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}
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void
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clearFlags()
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{
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flags.clear(PublicWrite);
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}
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// This function isn't really useful if TRACING_ON is not defined
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virtual void trace(const char *action); //!< trace event activity
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public:
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/// Event priorities, to provide tie-breakers for events scheduled
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/// at the same cycle. Most events are scheduled at the default
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/// priority; these values are used to control events that need to
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/// be ordered within a cycle.
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enum Priority {
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/// Minimum priority
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Minimum_Pri = SHRT_MIN,
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/// If we enable tracing on a particular cycle, do that as the
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/// very first thing so we don't miss any of the events on
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/// that cycle (even if we enter the debugger).
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Trace_Enable_Pri = -101,
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/// Breakpoints should happen before anything else (except
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/// enabling trace output), so we don't miss any action when
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/// debugging.
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Debug_Break_Pri = -100,
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/// CPU switches schedule the new CPU's tick event for the
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/// same cycle (after unscheduling the old CPU's tick event).
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/// The switch needs to come before any tick events to make
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/// sure we don't tick both CPUs in the same cycle.
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CPU_Switch_Pri = -31,
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/// For some reason "delayed" inter-cluster writebacks are
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/// scheduled before regular writebacks (which have default
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/// priority). Steve?
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Delayed_Writeback_Pri = -1,
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/// Default is zero for historical reasons.
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Default_Pri = 0,
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/// Serailization needs to occur before tick events also, so
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/// that a serialize/unserialize is identical to an on-line
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/// CPU switch.
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Serialize_Pri = 32,
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/// CPU ticks must come after other associated CPU events
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/// (such as writebacks).
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CPU_Tick_Pri = 50,
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/// Statistics events (dump, reset, etc.) come after
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/// everything else, but before exit.
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Stat_Event_Pri = 90,
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/// Progress events come at the end.
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Progress_Event_Pri = 95,
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/// If we want to exit on this cycle, it's the very last thing
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/// we do.
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Sim_Exit_Pri = 100,
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/// Maximum priority
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Maximum_Pri = SHRT_MAX
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};
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/*
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* Event constructor
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* @param queue that the event gets scheduled on
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*/
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Event(Priority p = Default_Pri)
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: nextBin(NULL), nextInBin(NULL), _priority(p)
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{
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#ifndef NDEBUG
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instance = ++instanceCounter;
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queue = NULL;
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#endif
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#ifdef EVENTQ_DEBUG
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flags.set(Initialized);
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whenCreated = curTick;
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whenScheduled = 0;
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#endif
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}
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virtual ~Event();
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virtual const std::string name() const;
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/// Return a C string describing the event. This string should
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/// *not* be dynamically allocated; just a const char array
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/// describing the event class.
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virtual const char *description() const;
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/// Dump the current event data
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void dump() const;
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public:
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/*
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* This member function is invoked when the event is processed
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* (occurs). There is no default implementation; each subclass
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* must provide its own implementation. The event is not
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* automatically deleted after it is processed (to allow for
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* statically allocated event objects).
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*
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* If the AutoDestroy flag is set, the object is deleted once it
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* is processed.
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*/
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virtual void process() = 0;
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/// Determine if the current event is scheduled
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bool scheduled() const { return flags.isSet(Scheduled); }
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/// Squash the current event
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void squash() { flags.set(Squashed); }
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/// Check whether the event is squashed
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bool squashed() const { return flags.isSet(Squashed); }
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/// See if this is a SimExitEvent (without resorting to RTTI)
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bool isExitEvent() const { return flags.isSet(IsExitEvent); }
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/// Get the time that the event is scheduled
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Tick when() const { return _when; }
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/// Get the event priority
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int priority() const { return _priority; }
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#ifndef SWIG
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struct priority_compare
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: public std::binary_function<Event *, Event *, bool>
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{
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bool
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operator()(const Event *l, const Event *r) const
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{
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return l->when() >= r->when() || l->priority() >= r->priority();
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}
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};
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virtual void serialize(std::ostream &os);
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virtual void unserialize(Checkpoint *cp, const std::string §ion);
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#endif
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};
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/*
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* Queue of events sorted in time order
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*/
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class EventQueue : public Serializable
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{
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private:
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std::string objName;
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Event *head;
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void insert(Event *event);
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void remove(Event *event);
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public:
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EventQueue(const std::string &n)
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: objName(n), head(NULL)
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{}
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virtual const std::string name() const { return objName; }
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// schedule the given event on this queue
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void schedule(Event *event, Tick when);
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void deschedule(Event *event);
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void reschedule(Event *event, Tick when, bool always = false);
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Tick nextTick() const { return head->when(); }
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Event *serviceOne();
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// process all events up to the given timestamp. we inline a
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// quick test to see if there are any events to process; if so,
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// call the internal out-of-line version to process them all.
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void
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serviceEvents(Tick when)
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{
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while (!empty()) {
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if (nextTick() > when)
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break;
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/**
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* @todo this assert is a good bug catcher. I need to
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* make it true again.
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*/
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//assert(head->when() >= when && "event scheduled in the past");
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serviceOne();
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}
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}
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// default: process all events up to 'now' (curTick)
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void serviceEvents() { serviceEvents(curTick); }
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// return true if no events are queued
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bool empty() const { return head == NULL; }
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void dump() const;
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Tick nextEventTime() { return empty() ? curTick : head->when(); }
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bool debugVerify() const;
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#ifndef SWIG
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virtual void serialize(std::ostream &os);
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virtual void unserialize(Checkpoint *cp, const std::string §ion);
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#endif
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};
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#ifndef SWIG
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class EventManager
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{
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protected:
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/** A pointer to this object's event queue */
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EventQueue *eventq;
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public:
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EventManager(EventManager &em) : eventq(em.queue()) {}
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EventManager(EventManager *em) : eventq(em ? em->queue() : NULL) {}
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EventManager(EventQueue *eq) : eventq(eq) {}
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EventQueue *
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queue() const
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{
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return eventq;
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}
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void
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schedule(Event &event, Tick when)
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{
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eventq->schedule(&event, when);
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}
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void
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deschedule(Event &event)
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{
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eventq->deschedule(&event);
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}
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void
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reschedule(Event &event, Tick when, bool always = false)
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{
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eventq->reschedule(&event, when, always);
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}
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void
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schedule(Event *event, Tick when)
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{
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eventq->schedule(event, when);
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}
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void
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deschedule(Event *event)
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{
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eventq->deschedule(event);
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}
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void
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reschedule(Event *event, Tick when, bool always = false)
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{
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eventq->reschedule(event, when, always);
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}
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};
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template <class T, void (T::* F)()>
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void
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DelayFunction(EventQueue *eventq, Tick when, T *object)
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{
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class DelayEvent : public Event
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{
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private:
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T *object;
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public:
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DelayEvent(T *o)
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: object(o)
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{ this->setFlags(AutoDelete); }
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void process() { (object->*F)(); }
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const char *description() const { return "delay"; }
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};
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eventq->schedule(new DelayEvent(object), when);
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}
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template <class T, void (T::* F)()>
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class EventWrapper : public Event
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{
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private:
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T *object;
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public:
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EventWrapper(T *obj, bool del = false, Priority p = Default_Pri)
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: Event(p), object(obj)
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{
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if (del)
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setFlags(AutoDelete);
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}
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void process() { (object->*F)(); }
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};
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inline void
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EventQueue::schedule(Event *event, Tick when)
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{
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assert((UTick)when >= (UTick)curTick);
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assert(!event->scheduled());
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#ifdef EVENTQ_DEBUG
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assert((event->flags & Event::Initialized) == Event::Initialized);
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#endif
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event->setWhen(when, this);
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insert(event);
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event->flags.set(Event::Scheduled);
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if (this == &mainEventQueue)
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event->flags.set(Event::IsMainQueue);
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else
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event->flags.clear(Event::IsMainQueue);
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if (DTRACE(Event))
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event->trace("scheduled");
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}
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inline void
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EventQueue::deschedule(Event *event)
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{
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assert(event->scheduled());
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#ifdef EVENTQ_DEBUG
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assert((event->flags & Event::Initialized) == Event::Initialized);
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#endif
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remove(event);
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event->flags.clear(Event::Squashed);
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event->flags.clear(Event::Scheduled);
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if (event->flags.isSet(Event::AutoDelete))
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delete event;
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if (DTRACE(Event))
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event->trace("descheduled");
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}
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inline void
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EventQueue::reschedule(Event *event, Tick when, bool always)
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{
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assert(when >= curTick);
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assert(always || event->scheduled());
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#ifdef EVENTQ_DEBUG
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assert((event->flags & Event::Initialized) == Event::Initialized);
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#endif
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if (event->scheduled())
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remove(event);
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event->setWhen(when, this);
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insert(event);
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event->flags.clear(Event::Squashed);
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event->flags.set(Event::Scheduled);
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if (this == &mainEventQueue)
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event->flags.set(Event::IsMainQueue);
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else
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event->flags.clear(Event::IsMainQueue);
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if (DTRACE(Event))
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event->trace("rescheduled");
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}
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inline bool
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operator<(const Event &l, const Event &r)
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{
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return l.when() < r.when() ||
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(l.when() == r.when() && l.priority() < r.priority());
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}
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inline bool
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operator>(const Event &l, const Event &r)
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{
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return l.when() > r.when() ||
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(l.when() == r.when() && l.priority() > r.priority());
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}
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inline bool
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operator<=(const Event &l, const Event &r)
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{
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return l.when() < r.when() ||
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(l.when() == r.when() && l.priority() <= r.priority());
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}
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inline bool
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operator>=(const Event &l, const Event &r)
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{
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return l.when() > r.when() ||
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(l.when() == r.when() && l.priority() >= r.priority());
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}
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inline bool
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operator==(const Event &l, const Event &r)
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{
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return l.when() == r.when() && l.priority() == r.priority();
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}
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inline bool
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operator!=(const Event &l, const Event &r)
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{
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return l.when() != r.when() || l.priority() != r.priority();
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}
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#endif
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#endif // __SIM_EVENTQ_HH__
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