time.cc revision 11793 
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 "base/time.hh"
32
33#include <cstdlib>
34#include <ctime>
35#include <iostream>
36#include <sstream>
37
38#include "config/use_posix_clock.hh"
39#include "sim/core.hh"
40#include "sim/serialize.hh"
41
42using namespace std;
43
44void
45Time::_set(bool monotonic)
46{
47#if USE_POSIX_CLOCK
48    ::clock_gettime(monotonic ? CLOCK_MONOTONIC : CLOCK_REALTIME, &_time);
49#else
50    timeval tv;
51    ::gettimeofday(&tv, NULL);
52    operator=(tv);
53#endif
54}
55
56void
57Time::setTick(Tick ticks)
58{
59    uint64_t nsecs = ticks / SimClock::Int::ns;
60    set(nsecs / NSEC_PER_SEC, nsecs % NSEC_PER_SEC);
61}
62
63Tick
64Time::getTick() const
65{
66    return (nsec() + sec() * NSEC_PER_SEC) * SimClock::Int::ns;
67}
68
69string
70Time::date(const string &format) const
71{
72    time_t sec = this->sec();
73    char buf[256];
74
75    if (format.empty()) {
76#ifdef __SUNPRO_CC
77        ctime_r(&sec, buf, sizeof(buf));
78#else
79        ctime_r(&sec, buf);
80#endif
81        buf[24] = '\0';
82        return buf;
83    }
84
85    struct tm *tm = localtime(&sec);
86    strftime(buf, sizeof(buf), format.c_str(), tm);
87    return buf;
88}
89
90string
91Time::time() const
92{
93    double time = double(*this);
94    double secs = fmod(time, 60.0);
95    double all_mins = floor(time / 60.0);
96    double mins = fmod(all_mins, 60.0);
97    double hours = floor(all_mins / 60.0);
98
99    stringstream str;
100
101    if (hours > 0.0) {
102        if (hours < 10.0)
103            str << '0';
104        str << hours << ':';
105    }
106
107    if (mins > 0.0) {
108        if (mins < 10.0)
109            str << '0';
110        str << mins << ':';
111    }
112
113    if (secs < 10.0 && !str.str().empty())
114        str << '0';
115    str << secs;
116
117    return str.str();
118}
119
120void
121Time::serialize(const std::string &base, CheckpointOut &cp) const
122{
123    paramOut(cp, base + ".sec", sec());
124    paramOut(cp, base + ".nsec", nsec());
125}
126
127void
128Time::unserialize(const std::string &base, CheckpointIn &cp)
129{
130    time_t secs;
131    time_t nsecs;
132    paramIn(cp, base + ".sec", secs);
133    paramIn(cp, 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