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
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtCore/QtCore>
#include <QTest>
#include <math.h>
#include <condition_variable>
#include <mutex>
#include <limits.h>
using namespace std::chrono_literals;
class tst_QWaitCondition : public QObject
{
Q_OBJECT
public:
tst_QWaitCondition()
{
}
private slots:
void oscillate_QWaitCondition_QMutex_data() { oscillate_mutex_data(); }
void oscillate_QWaitCondition_QMutex();
void oscillate_QWaitCondition_QReadWriteLock_data() { oscillate_mutex_data(); }
void oscillate_QWaitCondition_QReadWriteLock();
void oscillate_std_condition_variable_std_mutex_data() { oscillate_mutex_data(); }
void oscillate_std_condition_variable_std_mutex();
void oscillate_std_condition_variable_any_QMutex_data() { oscillate_mutex_data(); }
void oscillate_std_condition_variable_any_QMutex();
void oscillate_std_condition_variable_any_QReadWriteLock_data() { oscillate_mutex_data(); }
void oscillate_std_condition_variable_any_QReadWriteLock();
private:
void oscillate_mutex_data();
};
int turn;
const int threadCount = 10;
QWaitCondition cond;
std::condition_variable cv;
std::condition_variable_any cva;
template <typename Cond>
Cond *get();
template <> std::condition_variable *get() { return &cv; }
template <> std::condition_variable_any *get() { return &cva; }
template <class Cond, class Mutex, class Locker>
class OscillateThread : public QThread
{
public:
Mutex *mutex;
int m_threadid;
unsigned long timeout;
void run() override
{
for (int count = 0; count < 5000; ++count) {
Locker lock(*mutex);
while (m_threadid != turn) {
if (timeout == ULONG_MAX)
get<Cond>()->wait(lock);
else if (timeout == 0) // Windows doesn't unlock the mutex with a zero timeout
get<Cond>()->wait_for(lock, 1ns);
else
get<Cond>()->wait_for(lock, timeout * 1ms);
}
turn = (turn+1) % threadCount;
get<Cond>()->notify_all();
}
}
};
template <class Mutex, class Locker>
class OscillateThread<QWaitCondition, Mutex, Locker> : public QThread
{
public:
Mutex *mutex;
int m_threadid;
unsigned long timeout;
void run() override
{
for (int count = 0; count < 5000; ++count) {
Locker lock(mutex);
while (m_threadid != turn) {
cond.wait(mutex, timeout);
}
turn = (turn+1) % threadCount;
cond.wakeAll();
}
}
};
template <class Cond, class Mutex, class Locker>
void oscillate(unsigned long timeout) {
OscillateThread<Cond, Mutex, Locker> thrd[threadCount];
Mutex m;
for (int i = 0; i < threadCount; ++i) {
thrd[i].mutex = &m;
thrd[i].m_threadid = i;
thrd[i].timeout = timeout;
}
QBENCHMARK {
for (int i = 0; i < threadCount; ++i) {
thrd[i].start();
}
for (int i = 0; i < threadCount; ++i) {
thrd[i].wait();
}
}
}
void tst_QWaitCondition::oscillate_mutex_data()
{
QTest::addColumn<unsigned long>("timeout");
QTest::newRow("0") << 0ul;
QTest::newRow("1") << 1ul;
QTest::newRow("1000") << 1000ul;
QTest::newRow("forever") << ULONG_MAX;
}
void tst_QWaitCondition::oscillate_QWaitCondition_QMutex()
{
QFETCH(unsigned long, timeout);
oscillate<QWaitCondition, QMutex, QMutexLocker<QMutex>>(timeout);
}
void tst_QWaitCondition::oscillate_QWaitCondition_QReadWriteLock()
{
QFETCH(unsigned long, timeout);
oscillate<QWaitCondition, QReadWriteLock, QWriteLocker>(timeout);
}
void tst_QWaitCondition::oscillate_std_condition_variable_std_mutex()
{
QFETCH(unsigned long, timeout);
oscillate<std::condition_variable, std::mutex, std::unique_lock<std::mutex>>(timeout);
}
void tst_QWaitCondition::oscillate_std_condition_variable_any_QMutex()
{
QFETCH(unsigned long, timeout);
oscillate<std::condition_variable_any, QMutex, std::unique_lock<QMutex>>(timeout);
}
void tst_QWaitCondition::oscillate_std_condition_variable_any_QReadWriteLock()
{
QFETCH(unsigned long, timeout);
struct WriteLocker : QWriteLocker {
// adapt to BasicLockable
explicit WriteLocker(QReadWriteLock &m) : QWriteLocker{&m} {}
void lock() { relock(); }
};
oscillate<std::condition_variable_any, QReadWriteLock, WriteLocker>(timeout);
}
QTEST_MAIN(tst_QWaitCondition)
#include "tst_bench_qwaitcondition.moc"
|
