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/****************************************************************************
**
** Copyright (C) 2016 Olivier Goffart <ogoffart@woboq.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/QtCore>
#include <QtTest/QtTest>
#include <mutex>
#if QT_HAS_INCLUDE(<shared_mutex>)
#if __cplusplus > 201103L
#include <shared_mutex>
#endif
#endif
// Wrapers that take pointers instead of reference to have the same interface as Qt
template <typename T>
struct LockerWrapper : T
{
LockerWrapper(typename T::mutex_type *mtx)
: T(*mtx)
{
}
};
int threadCount;
class tst_QReadWriteLock : public QObject
{
Q_OBJECT
public:
tst_QReadWriteLock()
{
// at least 2 threads, even on single cpu/core machines
threadCount = qMax(2, QThread::idealThreadCount());
qDebug("thread count: %d", threadCount);
}
private slots:
void uncontended_data();
void uncontended();
void readOnly_data();
void readOnly();
// void readWrite();
};
struct FunctionPtrHolder
{
FunctionPtrHolder(QFunctionPointer value = nullptr)
: value(value)
{
}
QFunctionPointer value;
};
Q_DECLARE_METATYPE(FunctionPtrHolder)
struct FakeLock
{
FakeLock(volatile int *i) { *i = 0; }
};
enum { Iterations = 1000000 };
template <typename Mutex, typename Locker>
void testUncontended()
{
Mutex lock;
QBENCHMARK {
for (int i = 0; i < Iterations; ++i) {
Locker locker(&lock);
}
}
}
void tst_QReadWriteLock::uncontended_data()
{
QTest::addColumn<FunctionPtrHolder>("holder");
QTest::newRow("nothing") << FunctionPtrHolder(testUncontended<int, FakeLock>);
QTest::newRow("QMutex") << FunctionPtrHolder(testUncontended<QMutex, QMutexLocker>);
QTest::newRow("QReadWriteLock, read")
<< FunctionPtrHolder(testUncontended<QReadWriteLock, QReadLocker>);
QTest::newRow("QReadWriteLock, write")
<< FunctionPtrHolder(testUncontended<QReadWriteLock, QWriteLocker>);
QTest::newRow("std::mutex") << FunctionPtrHolder(
testUncontended<std::mutex, LockerWrapper<std::unique_lock<std::mutex>>>);
#if defined __cpp_lib_shared_timed_mutex
QTest::newRow("std::shared_timed_mutex, read") << FunctionPtrHolder(
testUncontended<std::shared_timed_mutex,
LockerWrapper<std::shared_lock<std::shared_timed_mutex>>>);
QTest::newRow("std::shared_timed_mutex, write") << FunctionPtrHolder(
testUncontended<std::shared_timed_mutex,
LockerWrapper<std::unique_lock<std::shared_timed_mutex>>>);
#endif
}
void tst_QReadWriteLock::uncontended()
{
QFETCH(FunctionPtrHolder, holder);
holder.value();
}
static QHash<QString, QString> global_hash;
template <typename Mutex, typename Locker>
void testReadOnly()
{
struct Thread : QThread
{
Mutex *lock;
void run()
{
for (int i = 0; i < Iterations; ++i) {
QString s = QString::number(i); // Do something outside the lock
Locker locker(lock);
global_hash.contains(s);
}
}
};
Mutex lock;
QVector<QThread *> threads;
for (int i = 0; i < threadCount; ++i) {
auto t = new Thread;
t->lock = &lock;
threads.append(t);
}
QBENCHMARK {
for (auto t : threads) {
t->start();
}
for (auto t : threads) {
t->wait();
}
}
qDeleteAll(threads);
}
void tst_QReadWriteLock::readOnly_data()
{
QTest::addColumn<FunctionPtrHolder>("holder");
QTest::newRow("nothing") << FunctionPtrHolder(testReadOnly<int, FakeLock>);
QTest::newRow("QMutex") << FunctionPtrHolder(testReadOnly<QMutex, QMutexLocker>);
QTest::newRow("QReadWriteLock") << FunctionPtrHolder(testReadOnly<QReadWriteLock, QReadLocker>);
QTest::newRow("std::mutex") << FunctionPtrHolder(
testReadOnly<std::mutex, LockerWrapper<std::unique_lock<std::mutex>>>);
#if defined __cpp_lib_shared_timed_mutex
QTest::newRow("std::shared_timed_mutex") << FunctionPtrHolder(
testReadOnly<std::shared_timed_mutex,
LockerWrapper<std::shared_lock<std::shared_timed_mutex>>>);
#endif
}
void tst_QReadWriteLock::readOnly()
{
QFETCH(FunctionPtrHolder, holder);
holder.value();
}
QTEST_MAIN(tst_QReadWriteLock)
#include "tst_qreadwritelock.moc"
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