sim_events.cc revision 2667:fe64b8353b1c 
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/param.hh"
37#include "sim/sim_events.hh"
38#include "sim/sim_exit.hh"
39#include "sim/startup.hh"
40#include "sim/stats.hh"
41
42using namespace std;
43
44//
45// handle termination event
46//
47void
48SimLoopExitEvent::process()
49{
50    // if this got scheduled on a different queue (e.g. the committed
51    // instruction queue) then make a corresponding event on the main
52    // queue.
53    if (theQueue() != &mainEventQueue) {
54        exitSimLoop(cause, code);
55        delete this;
56    }
57
58    // otherwise do nothing... the IsExitEvent flag takes care of
59    // exiting the simulation loop and returning this object to Python
60}
61
62
63const char *
64SimLoopExitEvent::description()
65{
66    return "simulation loop exit";
67}
68
69void
70exitSimLoop(Tick when, const std::string &message, int exit_code)
71{
72    new SimLoopExitEvent(when, message, exit_code);
73}
74
75void
76exitSimLoop(const std::string &message, int exit_code)
77{
78    exitSimLoop(curTick, message, exit_code);
79}
80
81//
82// constructor: automatically schedules at specified time
83//
84CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
85                                   Tick _when, int &_downCounter)
86    : Event(q, Sim_Exit_Pri),
87      cause(_cause),
88      downCounter(_downCounter)
89{
90    // catch stupid mistakes
91    assert(downCounter > 0);
92
93    schedule(_when);
94}
95
96
97//
98// handle termination event
99//
100void
101CountedExitEvent::process()
102{
103    if (--downCounter == 0) {
104        exitSimLoop(cause, 0);
105    }
106}
107
108
109const char *
110CountedExitEvent::description()
111{
112    return "counted exit";
113}
114
115#ifdef CHECK_SWAP_CYCLES
116new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
117#endif
118
119void
120CheckSwapEvent::process()
121{
122    /*  Check the amount of free swap space  */
123    long swap;
124
125    /*  returns free swap in KBytes  */
126    swap = procInfo("/proc/meminfo", "SwapFree:");
127
128    if (swap < 1000)
129        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
130
131    if (swap < 100) {
132        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
133        exitSimLoop("Lack of swap space");
134    }
135
136    schedule(curTick + interval);
137}
138
139const char *
140CheckSwapEvent::description()
141{
142    return "check swap";
143}
144
145//
146// handle progress event: print message and reschedule
147//
148void
149ProgressEvent::process()
150{
151    DPRINTFN("ProgressEvent\n");
152    // reschedule for next interval
153    schedule(curTick + interval);
154}
155
156
157const char *
158ProgressEvent::description()
159{
160    return "progress message";
161}
162