src/sim/eventq_impl.hh

   1 /*
   2  * Copyright (c) 2012 The Regents of The University of Michigan
   3  * Copyright (c) 2012-2013 Mark D. Hill and David A. Wood
   4  * Copyright (c) 2013 Advanced Micro Devices, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are
   9  * met: redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer;
  11  * redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution;
  14  * neither the name of the copyright holders nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef __SIM_EVENTQ_IMPL_HH__
  32 #define __SIM_EVENTQ_IMPL_HH__
  33
  34 #include "base/trace.hh"
  35 #include "sim/eventq.hh"
  36
  37 inline void
  38 EventQueue::schedule(Event *event, Tick when, bool global)
  39 {
  40     assert(when >= getCurTick());
  41     assert(!event->scheduled());
  42     assert(event->initialized());
  43
  44     event->setWhen(when, this);
  45
  46     // The check below is to make sure of two things
  47     // a. a thread schedules local events on other queues through the asyncq
  48     // b. a thread schedules global events on the asyncq, whether or not
  49     //    this event belongs to this eventq. This is required to maintain
  50     //    a total order amongst the global events. See global_event.{cc,hh}
  51     //    for more explanation.
  52     if (inParallelMode && (this != curEventQueue() || global)) {
  53         asyncInsert(event);
  54     } else {
  55         insert(event);
  56     }
  57     event->flags.set(Event::Scheduled);
  58     event->acquire();
  59
  60     if (DTRACE(Event))
  61         event->trace("scheduled");
  62 }
  63
  64 inline void
  65 EventQueue::deschedule(Event *event)
  66 {
  67     assert(event->scheduled());
  68     assert(event->initialized());
  69     assert(!inParallelMode || this == curEventQueue());
  70
  71     remove(event);
  72
  73     event->flags.clear(Event::Squashed);
  74     event->flags.clear(Event::Scheduled);
  75
  76     if (DTRACE(Event))
  77         event->trace("descheduled");
  78
  79     event->release();
  80 }
  81
  82 inline void
  83 EventQueue::reschedule(Event *event, Tick when, bool always)
  84 {
  85     assert(when >= getCurTick());
  86     assert(always || event->scheduled());
  87     assert(event->initialized());
  88     assert(!inParallelMode || this == curEventQueue());
  89
  90     if (event->scheduled()) {
  91         remove(event);
  92     } else {
  93         event->acquire();
  94     }
  95
  96     event->setWhen(when, this);
  97     insert(event);
  98     event->flags.clear(Event::Squashed);
  99     event->flags.set(Event::Scheduled);
 100
 101     if (DTRACE(Event))
 102         event->trace("rescheduled");
 103 }
 104
 105 #endif // __SIM_EVENTQ_IMPL_HH__