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// 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/QString>
#include <QtCore/QTime>
#include <QtCore/QElapsedTimer>
#include <QTest>
#include <QTimer>
static const int minResolution = 100; // the minimum resolution for the tests
QT_BEGIN_NAMESPACE
QDebug operator<<(QDebug s, const QElapsedTimer &t)
{
s.nospace() << "(" << t.msecsSinceReference() << ")";
return s.space();
}
QT_END_NAMESPACE
class tst_QElapsedTimer : public QObject
{
Q_OBJECT
private Q_SLOTS:
void statics();
void validity();
void basics();
void elapsed();
void msecsTo();
};
void tst_QElapsedTimer::statics()
{
qDebug() << "Clock type is" << QElapsedTimer::clockType();
qDebug() << "Said clock is" << (QElapsedTimer::isMonotonic() ? "monotonic" : "not monotonic");
QElapsedTimer t;
t.start();
qDebug() << "Current time is" << t.msecsSinceReference();
}
void tst_QElapsedTimer::validity()
{
QElapsedTimer t;
QVERIFY(!t.isValid()); // non-POD now, it should always start invalid
t.start();
QVERIFY(t.isValid());
t.invalidate();
QVERIFY(!t.isValid());
}
void tst_QElapsedTimer::basics()
{
QElapsedTimer t1;
t1.start();
QVERIFY(t1.msecsSinceReference() != 0);
QCOMPARE(t1, t1);
QVERIFY(!(t1 != t1));
QVERIFY(!(t1 < t1));
QCOMPARE(t1.msecsTo(t1), qint64(0));
QCOMPARE(t1.secsTo(t1), qint64(0));
quint64 value1 = t1.msecsSinceReference();
qDebug() << "value1:" << value1 << "t1:" << t1;
qint64 nsecs = t1.nsecsElapsed();
qint64 elapsed = t1.restart();
QVERIFY(elapsed < minResolution);
QVERIFY(nsecs / 1000000 < minResolution);
quint64 value2 = t1.msecsSinceReference();
qDebug() << "value2:" << value2 << "t1:" << t1
<< "elapsed:" << elapsed << "nsecs:" << nsecs;
// in theory, elapsed == value2 - value1
// However, since QElapsedTimer keeps internally the full resolution,
// we have here a rounding error due to integer division
QVERIFY(qAbs(elapsed - qint64(value2 - value1)) <= 1);
}
void tst_QElapsedTimer::elapsed()
{
qint64 nsecs = 0;
qint64 msecs = 0;
bool expired1 = false;
bool expired8 = false;
bool expiredInf = false;
qint64 elapsed = 0;
bool timerExecuted = false;
QElapsedTimer t1;
t1.start();
QTimer::singleShot(2 * minResolution, Qt::PreciseTimer, [&](){
nsecs = t1.nsecsElapsed();
msecs = t1.elapsed();
expired1 = t1.hasExpired(minResolution);
expired8 = t1.hasExpired(8 * minResolution);
expiredInf = t1.hasExpired(-1);
elapsed = t1.restart();
timerExecuted = true;
});
QTRY_VERIFY2_WITH_TIMEOUT(timerExecuted,
"Looks like timer didn't fire on time.", 4 * minResolution);
QVERIFY(nsecs > 0);
QVERIFY(msecs > 0);
// the number of elapsed nanoseconds and milliseconds should match
QVERIFY(nsecs - msecs * 1000000 < 1000000);
QVERIFY(expired1);
QVERIFY(!expired8);
QVERIFY(!expiredInf);
QVERIFY(elapsed >= msecs);
QVERIFY(elapsed < msecs + 3 * minResolution);
}
void tst_QElapsedTimer::msecsTo()
{
QElapsedTimer t1;
t1.start();
QTest::qSleep(minResolution);
QElapsedTimer t2;
t2.start();
QVERIFY(t1 != t2);
QVERIFY(!(t1 == t2));
QVERIFY(t1 < t2);
auto diff = t1.msecsTo(t2);
QVERIFY2(diff > 0, QString("difference t1 and t2 is %1").arg(diff).toLatin1());
diff = t2.msecsTo(t1);
QVERIFY2(diff < 0, QString("difference t2 and t1 is %1").arg(diff).toLatin1());
}
QTEST_MAIN(tst_QElapsedTimer);
#include "tst_qelapsedtimer.moc"
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