sim_events.cc revision 2797 
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
81void
82CountedQuiesceEvent::process()
83{
84    if (--count == 0) {
85        exitSimLoop("Finished quiesce");
86    }
87}
88
89//
90// constructor: automatically schedules at specified time
91//
92CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
93                                   Tick _when, int &_downCounter)
94    : Event(q, Sim_Exit_Pri),
95      cause(_cause),
96      downCounter(_downCounter)
97{
98    // catch stupid mistakes
99    assert(downCounter > 0);
100
101    schedule(_when);
102}
103
104
105//
106// handle termination event
107//
108void
109CountedExitEvent::process()
110{
111    if (--downCounter == 0) {
112        exitSimLoop(cause, 0);
113    }
114}
115
116
117const char *
118CountedExitEvent::description()
119{
120    return "counted exit";
121}
122
123#ifdef CHECK_SWAP_CYCLES
124new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
125#endif
126
127void
128CheckSwapEvent::process()
129{
130    /*  Check the amount of free swap space  */
131    long swap;
132
133    /*  returns free swap in KBytes  */
134    swap = procInfo("/proc/meminfo", "SwapFree:");
135
136    if (swap < 1000)
137        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
138
139    if (swap < 100) {
140        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
141        exitSimLoop("Lack of swap space");
142    }
143
144    schedule(curTick + interval);
145}
146
147const char *
148CheckSwapEvent::description()
149{
150    return "check swap";
151}
152
153//
154// handle progress event: print message and reschedule
155//
156void
157ProgressEvent::process()
158{
159    DPRINTFN("ProgressEvent\n");
160    // reschedule for next interval
161    schedule(curTick + interval);
162}
163
164
165const char *
166ProgressEvent::description()
167{
168    return "progress message";
169}
170