1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qtimestamp.h"
#include "qpair.h"
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#if !defined(QT_NO_CLOCK_MONOTONIC)
# if defined(QT_BOOTSTRAPPED)
# define QT_NO_CLOCK_MONOTONIC
# endif
#endif
QT_BEGIN_NAMESPACE
static qint64 fractionAdjustment()
{
if (QTimestamp::isMonotonic()) {
// the monotonic timer is measured in nanoseconds
// 1 ms = 1000000 ns
return 1000*1000ull;
} else {
// gettimeofday is measured in microseconds
// 1 ms = 1000 us
return 1000;
}
}
bool QTimestamp::isMonotonic()
{
#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
return true;
#else
static int returnValue = 0;
if (returnValue == 0) {
# if (_POSIX_MONOTONIC_CLOCK-0 < 0)
returnValue = -1;
# elif (_POSIX_MONOTONIC_CLOCK == 0)
// detect if the system support monotonic timers
long x = sysconf(_SC_MONOTONIC_CLOCK);
returnValue = (x >= 200112L) ? 1 : -1;
# endif
}
return returnValue != -1;
#endif
}
static inline QPair<long, long> do_gettime()
{
#if (_POSIX_MONOTONIC_CLOCK-0 > 0)
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return qMakePair(ts.tv_sec, ts.tv_nsec);
#else
# if !defined(QT_NO_CLOCK_MONOTONIC) && !defined(QT_BOOTSTRAPPED)
if (QTimestamp::isMonotonic()) {
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return qMakePair(ts.tv_sec, ts.tv_nsec);
}
# endif
// use gettimeofday
timeval tv;
::gettimeofday(&tv, 0);
return qMakePair(tv.tv_sec, tv.tv_usec);
#endif
}
// used in qcore_unix.cpp and qeventdispatcher_unix.cpp
timeval qt_gettime()
{
QPair<long, long> r = do_gettime();
timeval tv;
tv.tv_sec = r.first;
tv.tv_usec = r.second;
if (QTimestamp::isMonotonic())
tv.tv_usec /= 1000;
return tv;
}
void QTimestamp::start()
{
QPair<long, long> r = do_gettime();
t1 = r.first;
t2 = r.second;
}
qint64 QTimestamp::restart()
{
QPair<long, long> r = do_gettime();
qint64 oldt1 = t1;
qint64 oldt2 = t2;
t1 = r.first;
t2 = r.second;
r.first -= oldt1;
r.second -= oldt2;
return r.first * 1000 + r.second / fractionAdjustment();
}
qint64 QTimestamp::elapsed() const
{
QTimestamp now;
now.start();
return msecsTo(now);
}
qint64 QTimestamp::msecsTo(const QTimestamp &other) const
{
qint64 secs = other.t1 - t1;
qint64 fraction = other.t2 - t2;
return secs * 1000 + fraction / fractionAdjustment();
}
void QTimestamp::addMSecs(int ms)
{
t1 += ms / 1000;
t2 += ms % 1000 * fractionAdjustment();
}
qint64 QTimestamp::secsTo(const QTimestamp &other) const
{
return other.t1 - t1;
}
void QTimestamp::addSecs(int secs)
{
t1 += secs;
}
bool operator<(const QTimestamp &v1, const QTimestamp &v2)
{
return v1.t1 < v2.t1 || (v1.t1 == v2.t1 && v1.t2 < v2.t2);
}
QT_END_NAMESPACE
|
