xref: /gem5/src/sim/eventq_impl.hh

/*
 * Copyright (c) 2012 The Regents of The University of Michigan
 * Copyright (c) 2012-2013 Mark D. Hill and David A. Wood
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * 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: Steve Reinhardt
 *          Nathan Binkert
 *          Nilay Vaish
 */

#ifndef __SIM_EVENTQ_IMPL_HH__
#define __SIM_EVENTQ_IMPL_HH__

#include "base/trace.hh"
#include "sim/eventq.hh"

inline void
EventQueue::schedule(Event *event, Tick when, bool global)
{
    assert(when >= getCurTick());
    assert(!event->scheduled());
    assert(event->initialized());

    event->setWhen(when, this);

    // The check below is to make sure of two things
    // a. a thread schedules local events on other queues through the asyncq
    // b. a thread schedules global events on the asyncq, whether or not
    //    this event belongs to this eventq. This is required to maintain
    //    a total order amongst the global events. See global_event.{cc,hh}
    //    for more explanation.
    if (inParallelMode && (this != curEventQueue() || global)) {
        asyncInsert(event);
    } else {
        insert(event);
    }
    event->flags.set(Event::Scheduled);
    event->acquire();

    if (DTRACE(Event))
        event->trace("scheduled");
}

inline void
EventQueue::deschedule(Event *event)
{
    assert(event->scheduled());
    assert(event->initialized());
    assert(!inParallelMode || this == curEventQueue());

    remove(event);

    event->flags.clear(Event::Squashed);
    event->flags.clear(Event::Scheduled);

    if (DTRACE(Event))
        event->trace("descheduled");

    event->release();
}

inline void
EventQueue::reschedule(Event *event, Tick when, bool always)
{
    assert(when >= getCurTick());
    assert(always || event->scheduled());
    assert(event->initialized());
    assert(!inParallelMode || this == curEventQueue());

    if (event->scheduled()) {
        remove(event);
    } else {
        event->acquire();
    }

    event->setWhen(when, this);
    insert(event);
    event->flags.clear(Event::Squashed);
    event->flags.set(Event::Scheduled);

    if (DTRACE(Event))
        event->trace("rescheduled");
}

#endif // __SIM_EVENTQ_IMPL_HH__