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// Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QObject>
#include <QScopeGuard>
#include <QSharedPointer>
#include <QTest>
#include <atomic>
#include <memory>
#include <thread>
#include <vector>
#if __has_include(<boost/shared_ptr.hpp>)
# include <boost/shared_ptr.hpp>
# include <boost/make_shared.hpp>
# ifdef BOOST_NO_EXCEPTIONS
// https://stackoverflow.com/a/9530546/134841
// https://www.boost.org/doc/libs/1_79_0/libs/throw_exception/doc/html/throw_exception.html#throw_exception
BOOST_NORETURN void boost::throw_exception(const std::exception &) { std::terminate(); }
# if BOOST_VERSION >= 107300
// https://www.boost.org/doc/libs/1_79_0/libs/throw_exception/doc/html/throw_exception.html#changes_in_1_73_0
BOOST_NORETURN void boost::throw_exception(const std::exception &, const boost::source_location &)
{ std::terminate(); }
# endif // Boost v1.73
# endif // BOOST_NO_EXCEPTIONS
# define ONLY_IF_BOOST(x) x
#else
# define ONLY_IF_BOOST(x) QSKIP("This benchmark requires Boost.SharedPtr.")
#endif
class tst_QSharedPointer : public QObject
{
Q_OBJECT
private Q_SLOTS:
void refAndDeref_null_QSP_int() { refAndDeref<QSharedPointer<int>>(); }
void refAndDeref_null_SSP_int() { refAndDeref<std::shared_ptr<int>>(); }
void refAndDeref_null_BSP_int() { ONLY_IF_BOOST(refAndDeref<boost::shared_ptr<int>>()); }
void refAndDeref_null_QSP_QString() { refAndDeref<QSharedPointer<QString>>(); }
void refAndDeref_null_SSP_QString() { refAndDeref<std::shared_ptr<QString>>(); }
void refAndDeref_null_BSP_QString() { ONLY_IF_BOOST(refAndDeref<boost::shared_ptr<QString>>()); }
void refAndDeref_nonnull_QSP_int() { refAndDeref(QSharedPointer<int>::create(42)); }
void refAndDeref_nonnull_SSP_int() { refAndDeref(std::make_shared<int>(42)); }
void refAndDeref_nonnull_BSP_int() { ONLY_IF_BOOST(refAndDeref(boost::make_shared<int>(42))); }
void refAndDeref_nonnull_QSP_QString() { refAndDeref(QSharedPointer<QString>::create(QStringLiteral("Hello"))); }
void refAndDeref_nonnull_SSP_QString() { refAndDeref(std::make_shared<QString>(QStringLiteral("Hello"))); }
void refAndDeref_nonnull_BSP_QString() { ONLY_IF_BOOST(refAndDeref(boost::make_shared<QString>(QStringLiteral("Hello")))); }
private:
template <typename SP>
void refAndDeref(SP sp = {})
{
QBENCHMARK {
[[maybe_unused]] auto copy = sp;
}
}
private Q_SLOTS:
void threadedRefAndDeref_null_QSP_int() { threadedRefAndDeref<QSharedPointer<int>>(); }
void threadedRefAndDeref_null_SSP_int() { threadedRefAndDeref<std::shared_ptr<int>>(); }
void threadedRefAndDeref_null_BSP_int() { ONLY_IF_BOOST(threadedRefAndDeref<boost::shared_ptr<int>>()); }
void threadedRefAndDeref_null_QSP_QString() { threadedRefAndDeref<QSharedPointer<QString>>(); }
void threadedRefAndDeref_null_SSP_QString() { threadedRefAndDeref<std::shared_ptr<QString>>(); }
void threadedRefAndDeref_null_BSP_QString() { ONLY_IF_BOOST(threadedRefAndDeref<boost::shared_ptr<QString>>()); }
void threadedRefAndDeref_nonnull_QSP_int() { threadedRefAndDeref(QSharedPointer<int>::create(42)); }
void threadedRefAndDeref_nonnull_SSP_int() { threadedRefAndDeref(std::make_shared<int>(42)); }
void threadedRefAndDeref_nonnull_BSP_int() { ONLY_IF_BOOST(threadedRefAndDeref(boost::make_shared<int>(42))); }
void threadedRefAndDeref_nonnull_QSP_QString() { threadedRefAndDeref(QSharedPointer<QString>::create(QStringLiteral("Hello"))); }
void threadedRefAndDeref_nonnull_SSP_QString() { threadedRefAndDeref(std::make_shared<QString>(QStringLiteral("Hello"))); }
void threadedRefAndDeref_nonnull_BSP_QString() { ONLY_IF_BOOST(threadedRefAndDeref(boost::make_shared<QString>(QStringLiteral("Hello")))); }
private:
template <typename SP>
void threadedRefAndDeref(SP sp = {})
{
std::atomic<bool> cancel = false;
std::vector<std::thread> threads;
const auto numCores = std::max(2U, std::thread::hardware_concurrency());
for (uint i = 0; i < numCores - 1; ++i) {
threads.emplace_back([sp, &cancel] {
while (!cancel.load(std::memory_order_relaxed)) {
for (int i = 0; i < 100; ++i)
[[maybe_unused]] auto copy = sp;
}
});
}
const auto join = qScopeGuard([&] {
cancel.store(true, std::memory_order_relaxed);
for (auto &t : threads)
t.join();
});
QBENCHMARK {
[[maybe_unused]] auto copy = sp;
}
}
};
QTEST_MAIN(tst_QSharedPointer)
#include "tst_bench_shared_ptr.moc"
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