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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtCore/private/qatomicscopedvaluerollback_p.h>
#include <QTest>
class tst_QAtomicScopedValueRollback : public QObject
{
Q_OBJECT
private Q_SLOTS:
void leavingScope();
void leavingScopeAfterCommit();
void rollbackToPreviousCommit();
void exceptions();
void earlyExitScope();
private:
void earlyExitScope_helper(int exitpoint, std::atomic<int> &member);
};
void tst_QAtomicScopedValueRollback::leavingScope()
{
QAtomicInt i = 0;
QBasicAtomicInteger<bool> b = false;
std::atomic<bool> b2 = false;
//test rollback on going out of scope
{
QAtomicScopedValueRollback ri(i);
QAtomicScopedValueRollback rb(b);
QAtomicScopedValueRollback rb2(b2, true);
QCOMPARE(b.loadRelaxed(), false);
QCOMPARE(b2, true);
QCOMPARE(i.loadRelaxed(), 0);
b.storeRelaxed(true);
i.storeRelaxed(1);
QCOMPARE(b.loadRelaxed(), true);
QCOMPARE(i.loadRelaxed(), 1);
}
QCOMPARE(b.loadRelaxed(), false);
QCOMPARE(b2, false);
QCOMPARE(i.loadRelaxed(), 0);
}
void tst_QAtomicScopedValueRollback::leavingScopeAfterCommit()
{
std::atomic<int> i = 0;
QAtomicInteger<bool> b = false;
//test rollback on going out of scope
{
QAtomicScopedValueRollback ri(i);
QAtomicScopedValueRollback rb(b);
QCOMPARE(b.loadRelaxed(), false);
QCOMPARE(i, 0);
b.storeRelaxed(true);
i = 1;
QCOMPARE(b.loadRelaxed(), true);
QCOMPARE(i, 1);
ri.commit();
rb.commit();
}
QCOMPARE(b.loadRelaxed(), true);
QCOMPARE(i, 1);
}
void tst_QAtomicScopedValueRollback::rollbackToPreviousCommit()
{
QBasicAtomicInt i = 0;
{
QAtomicScopedValueRollback ri(i);
i++;
ri.commit();
i++;
}
QCOMPARE(i.loadRelaxed(), 1);
{
QAtomicScopedValueRollback ri1(i);
i++;
ri1.commit();
i++;
ri1.commit();
i++;
}
QCOMPARE(i.loadRelaxed(), 3);
}
void tst_QAtomicScopedValueRollback::exceptions()
{
std::atomic<bool> b = false;
bool caught = false;
QT_TRY
{
QAtomicScopedValueRollback rb(b);
b = true;
QT_THROW(std::bad_alloc()); //if Qt compiled without exceptions this is noop
rb.commit(); //if Qt compiled without exceptions, true is committed
}
QT_CATCH(...)
{
caught = true;
}
QCOMPARE(b, !caught); //expect false if exception was thrown, true otherwise
}
void tst_QAtomicScopedValueRollback::earlyExitScope()
{
QAtomicInt ai = 0;
std::atomic<int> aj = 0;
while (true) {
QAtomicScopedValueRollback ri(ai);
++ai;
aj = ai.loadRelaxed();
if (ai.loadRelaxed() > 8) break;
ri.commit();
}
QCOMPARE(ai.loadRelaxed(), 8);
QCOMPARE(aj.load(), 9);
for (int i = 0; i < 5; ++i) {
aj = 1;
earlyExitScope_helper(i, aj);
QCOMPARE(aj.load(), 1 << i);
}
}
static void operator*=(std::atomic<int> &lhs, int rhs)
{
int expected = lhs.load();
while (!lhs.compare_exchange_weak(expected, expected * rhs))
;
}
void tst_QAtomicScopedValueRollback::earlyExitScope_helper(int exitpoint, std::atomic<int>& member)
{
QAtomicScopedValueRollback r(member);
member *= 2;
if (exitpoint == 0)
return;
r.commit();
member *= 2;
if (exitpoint == 1)
return;
r.commit();
member *= 2;
if (exitpoint == 2)
return;
r.commit();
member *= 2;
if (exitpoint == 3)
return;
r.commit();
}
QTEST_MAIN(tst_QAtomicScopedValueRollback)
#include "tst_qatomicscopedvaluerollback.moc"
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