time.cc revision 10531 
1/*
2 * Copyright (c) 2003-2005 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 <cstdlib>
32#include <ctime>
33#include <iostream>
34#include <sstream>
35
36#include "base/time.hh"
37#include "config/use_posix_clock.hh"
38#include "sim/core.hh"
39#include "sim/serialize.hh"
40
41using namespace std;
42
43void
44Time::_set(bool monotonic)
45{
46#if USE_POSIX_CLOCK
47    ::clock_gettime(monotonic ? CLOCK_MONOTONIC : CLOCK_REALTIME, &_time);
48#else
49    timeval tv;
50    ::gettimeofday(&tv, NULL);
51    operator=(tv);
52#endif
53}
54
55void
56Time::setTick(Tick ticks)
57{
58    uint64_t nsecs = ticks / SimClock::Int::ns;
59    set(nsecs / NSEC_PER_SEC, nsecs % NSEC_PER_SEC);
60}
61
62Tick
63Time::getTick() const
64{
65    return (nsec() + sec() * NSEC_PER_SEC) * SimClock::Int::ns;
66}
67
68string
69Time::date(const string &format) const
70{
71    time_t sec = this->sec();
72    char buf[256];
73
74    if (format.empty()) {
75#ifdef __SUNPRO_CC
76        ctime_r(&sec, buf, sizeof(buf));
77#else
78        ctime_r(&sec, buf);
79#endif
80        buf[24] = '\0';
81        return buf;
82    }
83
84    struct tm *tm = localtime(&sec);
85    strftime(buf, sizeof(buf), format.c_str(), tm);
86    return buf;
87}
88
89string
90Time::time() const
91{
92    double time = double(*this);
93    double secs = fmod(time, 60.0);
94    double all_mins = floor(time / 60.0);
95    double mins = fmod(all_mins, 60.0);
96    double hours = floor(all_mins / 60.0);
97
98    stringstream str;
99
100    if (hours > 0.0) {
101        if (hours < 10.0)
102            str << '0';
103        str << hours << ':';
104    }
105
106    if (mins > 0.0) {
107        if (mins < 10.0)
108            str << '0';
109        str << mins << ':';
110    }
111
112    if (secs < 10.0 && !str.str().empty())
113        str << '0';
114    str << secs;
115
116    return str.str();
117}
118
119void
120Time::serialize(const std::string &base, ostream &os)
121{
122    paramOut(os, base + ".sec", sec());
123    paramOut(os, base + ".nsec", nsec());
124}
125
126void
127Time::unserialize(const std::string &base, Checkpoint *cp,
128                  const string &section)
129{
130    time_t secs;
131    time_t nsecs;
132    paramIn(cp, section, base + ".sec", secs);
133    paramIn(cp, section, base + ".nsec", nsecs);
134    sec(secs);
135    nsec(nsecs);
136}
137
138void
139sleep(const Time &time)
140{
141    timespec ts = time;
142
143#if USE_POSIX_CLOCK
144    clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
145#else
146    nanosleep(&ts, NULL);
147#endif
148}
149
150time_t
151mkutctime(struct tm *time)
152{
153    // get the current timezone
154    char *tz = getenv("TZ");
155
156    // copy the string as the pointer gets invalidated when updating
157    // the environment
158    if (tz) {
159        tz = strdup(tz);
160        if (!tz) {
161            fatal("Failed to reserve memory for UTC time conversion\n");
162        }
163    }
164
165    // change to UTC and get the time
166    setenv("TZ", "", 1);
167    tzset();
168    time_t ret = mktime(time);
169
170    // restore the timezone again
171    if (tz) {
172        setenv("TZ", tz, 1);
173        free(tz);
174    } else {
175        unsetenv("TZ");
176    }
177    tzset();
178
179    return ret;
180}
181
182