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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#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"