sim_events.cc revision 5606 
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 * Authors: Nathan Binkert
29 */
30
31#include <string>
32
33#include "base/callback.hh"
34#include "base/hostinfo.hh"
35#include "sim/eventq.hh"
36#include "sim/sim_events.hh"
37#include "sim/sim_exit.hh"
38#include "sim/startup.hh"
39#include "sim/stats.hh"
40
41using namespace std;
42
43SimLoopExitEvent::SimLoopExitEvent(const std::string &_cause, int c, Tick r)
44    : Event(Sim_Exit_Pri), cause(_cause), code(c), repeat(r)
45{
46    setFlags(IsExitEvent);
47}
48
49
50//
51// handle termination event
52//
53void
54SimLoopExitEvent::process()
55{
56    // if this got scheduled on a different queue (e.g. the committed
57    // instruction queue) then make a corresponding event on the main
58    // queue.
59    if (!getFlags(IsMainQueue)) {
60        exitSimLoop(cause, code);
61        delete this;
62    }
63
64    // otherwise do nothing... the IsExitEvent flag takes care of
65    // exiting the simulation loop and returning this object to Python
66
67    // but if you are doing this on intervals, don't forget to make another
68    if (repeat) {
69        assert(getFlags(IsMainQueue));
70        mainEventQueue.schedule(this, curTick + repeat);
71    }
72}
73
74
75const char *
76SimLoopExitEvent::description() const
77{
78    return "simulation loop exit";
79}
80
81void
82exitSimLoop(const std::string &message, int exit_code)
83{
84    Event *event = new SimLoopExitEvent(message, exit_code);
85    mainEventQueue.schedule(event, curTick);
86}
87
88CountedDrainEvent::CountedDrainEvent()
89    : SimLoopExitEvent("Finished drain", 0), count(0)
90{ }
91
92void
93CountedDrainEvent::process()
94{
95    if (--count == 0)
96        exitSimLoop(cause, code);
97}
98
99//
100// constructor: automatically schedules at specified time
101//
102CountedExitEvent::CountedExitEvent(const std::string &_cause, int &counter)
103    : Event(Sim_Exit_Pri), cause(_cause), downCounter(counter)
104{
105    // catch stupid mistakes
106    assert(downCounter > 0);
107}
108
109
110//
111// handle termination event
112//
113void
114CountedExitEvent::process()
115{
116    if (--downCounter == 0) {
117        exitSimLoop(cause, 0);
118    }
119}
120
121
122const char *
123CountedExitEvent::description() const
124{
125    return "counted exit";
126}
127
128CheckSwapEvent::CheckSwapEvent(int ival)
129    : interval(ival)
130{
131    mainEventQueue.schedule(this, curTick + interval);
132}
133
134void
135CheckSwapEvent::process()
136{
137    /*  Check the amount of free swap space  */
138    long swap;
139
140    /*  returns free swap in KBytes  */
141    swap = procInfo("/proc/meminfo", "SwapFree:");
142
143    if (swap < 1000)
144        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
145
146    if (swap < 100) {
147        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
148        exitSimLoop("Lack of swap space");
149    }
150
151    assert(getFlags(IsMainQueue));
152    mainEventQueue.schedule(this, curTick + interval);
153}
154
155const char *
156CheckSwapEvent::description() const
157{
158    return "check swap";
159}
160