sched_event.hh

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/*
 * Copyright 2018 Google, Inc.
 *
 * 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
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#ifndef __SYSTEMC_CORE_SCHED_EVENT_HH__
#define __SYSTEMC_CORE_SCHED_EVENT_HH__
 
#include <functional>
#include <list>
 
#include "base/types.hh"
 
namespace sc_gem5
{
 
class ScEvent;
 
typedef std::list<ScEvent *> ScEvents;
 
class ScEvent
{
  private:
    std::function<void()> work;
    gem5::Tick _when;
    ScEvents *_events;
    ScEvents::iterator _it;
 
    friend class Scheduler;
 
    void
    schedule(ScEvents &events, gem5::Tick w)
    {
        when(w);
        assert(!scheduled());
        _events = &events;
        _events->push_back(this);
        _it = _events->end();
        _it--;
    }
 
    void
    deschedule()
    {
        assert(scheduled());
        _events->erase(_it);
        _events = nullptr;
    }
  public:
    ScEvent(std::function<void()> work) :
        work(work), _when(gem5::MaxTick), _events(nullptr)
    {}
 
    ~ScEvent();
 
    bool scheduled() { return _events != nullptr; }
    ScEvents *scheduledOn() { return _events; }
 
    void when(gem5::Tick w) { _when = w; }
    gem5::Tick when() { return _when; }
 
    void run() { deschedule(); work(); }
};
 
} // namespace sc_gem5
 
#endif // __SYSTEMC_CORE_SCHED_EVENT_HH__