sim_events.cc revision 4762:c94e103c83ad 
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
43//
44// handle termination event
45//
46void
47SimLoopExitEvent::process()
48{
49    // if this got scheduled on a different queue (e.g. the committed
50    // instruction queue) then make a corresponding event on the main
51    // queue.
52    if (theQueue() != &mainEventQueue) {
53        exitSimLoop(cause, code);
54        delete this;
55    }
56
57    // otherwise do nothing... the IsExitEvent flag takes care of
58    // exiting the simulation loop and returning this object to Python
59
60    // but if you are doing this on intervals, don't forget to make another
61    if (repeat) {
62        schedule(curTick + repeat);
63    }
64}
65
66
67const char *
68SimLoopExitEvent::description()
69{
70    return "simulation loop exit";
71}
72
73SimLoopExitEvent *
74schedExitSimLoop(const std::string &message, Tick when, Tick repeat,
75                 EventQueue *q, int exit_code)
76{
77    if (q == NULL)
78        q = &mainEventQueue;
79
80    return new SimLoopExitEvent(q, when, repeat, message, exit_code);
81}
82
83void
84exitSimLoop(const std::string &message, int exit_code)
85{
86    schedExitSimLoop(message, curTick, 0, NULL, exit_code);
87}
88
89void
90CountedDrainEvent::process()
91{
92    if (--count == 0) {
93        exitSimLoop("Finished drain");
94    }
95}
96
97//
98// constructor: automatically schedules at specified time
99//
100CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
101                                   Tick _when, int &_downCounter)
102    : Event(q, Sim_Exit_Pri),
103      cause(_cause),
104      downCounter(_downCounter)
105{
106    // catch stupid mistakes
107    assert(downCounter > 0);
108
109    schedule(_when);
110}
111
112
113//
114// handle termination event
115//
116void
117CountedExitEvent::process()
118{
119    if (--downCounter == 0) {
120        exitSimLoop(cause, 0);
121    }
122}
123
124
125const char *
126CountedExitEvent::description()
127{
128    return "counted exit";
129}
130
131#ifdef CHECK_SWAP_CYCLES
132new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
133#endif
134
135void
136CheckSwapEvent::process()
137{
138    /*  Check the amount of free swap space  */
139    long swap;
140
141    /*  returns free swap in KBytes  */
142    swap = procInfo("/proc/meminfo", "SwapFree:");
143
144    if (swap < 1000)
145        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
146
147    if (swap < 100) {
148        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
149        exitSimLoop("Lack of swap space");
150    }
151
152    schedule(curTick + interval);
153}
154
155const char *
156CheckSwapEvent::description()
157{
158    return "check swap";
159}
160