gem5/src/cpu/cpuevent.hh

/*
 * Copyright (c) 2006 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.
 *
 * Authors: Ali Saidi
 */

#ifndef __CPU_CPUEVENT_HH__
#define __CPU_CPUEVENT_HH__

#include <vector>
#include "sim/eventq.hh"

class ThreadContext;

/** This class creates a global list of events that need a pointer to a
 * thread context. When a switchover takes place the events can be migrated
 * to the new thread context, otherwise you could have a wake timer interrupt
 * go off on a switched out cpu or other unfortunate events. This object MUST be
 * dynamically allocated to avoid it being deleted after a cpu switch happens.
 * */
class CpuEvent : public Event
{
  protected:
    /** type of global list of cpu events. */
    typedef std::vector<CpuEvent *> CpuEventList;

    /** Static list of cpu events that is searched every time a cpu switch
     * happens. */
    static CpuEventList cpuEventList;

    /** The thread context that is switched to the new cpus. */
    ThreadContext *tc;

  public:
    CpuEvent(EventQueue *q, ThreadContext *_tc, Priority p = Default_Pri)
        : Event(q, p), tc(_tc)
    { cpuEventList.push_back(this); }

    /** delete the cpu event from the global list. */
    ~CpuEvent();

    /** Update all events switching old tc to new tc.
     * @param oldTc the old thread context we are switching from
     * @param newTc the new thread context we are switching to.
     */
    static void replaceThreadContext(ThreadContext *oldTc,
                                     ThreadContext *newTc);
};

template <class T, void (T::* F)(ThreadContext *tc)>
class CpuEventWrapper : public CpuEvent
{
  private:
    T *object;

  public:
    CpuEventWrapper(T *obj, ThreadContext *_tc, EventQueue *q = &mainEventQueue,
            Priority p = Default_Pri)
        : CpuEvent(q, _tc, p), object(obj)
    { }
    void process() { (object->*F)(tc); }
};

#endif // __CPU_CPUEVENT_HH__