sim/sim_events.cc

   1 /*
   2  * Copyright (c) 2002-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <string>
  30
  31 #include "base/callback.hh"
  32 #include "base/hostinfo.hh"
  33 #include "sim/eventq.hh"
  34 #include "sim/param.hh"
  35 #include "sim/sim_events.hh"
  36 #include "sim/sim_exit.hh"
  37 #include "sim/startup.hh"
  38 #include "sim/stats.hh"
  39
  40 using namespace std;
  41
  42 //
  43 // handle termination event
  44 //
  45 void
  46 SimExitEvent::process()
  47 {
  48     // This event does not autodelete because exitNow may be called,
  49     // and the function will never be allowed to finish.
  50     if (theQueue() == &mainEventQueue) {
  51         string _cause = cause;
  52         int _code = code;
  53         delete this;
  54         exitNow(_cause, _code);
  55     } else {
  56         new SimExitEvent(cause, code);
  57         delete this;
  58     }
  59 }
  60
  61
  62 const char *
  63 SimExitEvent::description()
  64 {
  65     return "simulation termination";
  66 }
  67
  68 //
  69 // constructor: automatically schedules at specified time
  70 //
  71 CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
  72                                    Tick _when, int &_downCounter)
  73     : Event(q, Sim_Exit_Pri),
  74       cause(_cause),
  75       downCounter(_downCounter)
  76 {
  77     // catch stupid mistakes
  78     assert(downCounter > 0);
  79
  80     schedule(_when);
  81 }
  82
  83
  84 //
  85 // handle termination event
  86 //
  87 void
  88 CountedExitEvent::process()
  89 {
  90     if (--downCounter == 0) {
  91         new SimExitEvent(cause, 0);
  92     }
  93 }
  94
  95
  96 const char *
  97 CountedExitEvent::description()
  98 {
  99     return "counted exit";
 100 }
 101
 102 #ifdef CHECK_SWAP_CYCLES
 103 new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
 104 #endif
 105
 106 void
 107 CheckSwapEvent::process()
 108 {
 109     /*  Check the amount of free swap space  */
 110     long swap;
 111
 112     /*  returns free swap in KBytes  */
 113     swap = procInfo("/proc/meminfo", "SwapFree:");
 114
 115     if (swap < 1000)
 116         ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
 117
 118     if (swap < 100) {
 119         cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
 120         new SimExitEvent("Lack of swap space");
 121     }
 122
 123     schedule(curTick + interval);
 124 }
 125
 126 const char *
 127 CheckSwapEvent::description()
 128 {
 129     return "check swap";
 130 }
 131
 132 //
 133 // handle progress event: print message and reschedule
 134 //
 135 void
 136 ProgressEvent::process()
 137 {
 138     DPRINTFN("ProgressEvent\n");
 139     // reschedule for next interval
 140     schedule(curTick + interval);
 141 }
 142
 143
 144 const char *
 145 ProgressEvent::description()
 146 {
 147     return "progress message";
 148 }