qt 6.5.1 original

tests/auto/concurrent/qtconcurrenttask/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## tst_qtconcurrenttask Test:
+#####################################################################
+
+qt_internal_add_test(tst_qtconcurrenttask
+    SOURCES
+        tst_qtconcurrenttask.cpp
+    LIBRARIES
+        Qt::Concurrent
+)

tests/auto/concurrent/qtconcurrenttask/tst_qtconcurrenttask.cpp

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+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <qtconcurrenttask.h>
+
+#include <QTest>
+#include <QSemaphore>
+
+#include <random>
+
+class tst_QtConcurrentTask : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void taskWithFreeFunction();
+    void taskWithClassMethod();
+    void taskWithCallableObject();
+    void taskWithLambda();
+    void taskWithArguments();
+    void useCustomThreadPool();
+    void setPriority_data();
+    void setPriority();
+    void adjustAllSettings();
+    void ignoreFutureResult();
+    void withPromise();
+};
+
+using namespace QtConcurrent;
+
+void tst_QtConcurrentTask::taskWithFreeFunction()
+{
+    QVariant value(42);
+
+    auto result = task(&qvariant_cast<int>)
+                      .withArguments(value)
+                      .spawn()
+                      .result();
+
+    QCOMPARE(result, 42);
+}
+
+void tst_QtConcurrentTask::taskWithClassMethod()
+{
+    QString result("foobar");
+
+    task(&QString::chop).withArguments(&result, 3).spawn().waitForFinished();
+
+    QCOMPARE(result, "foo");
+}
+
+void tst_QtConcurrentTask::taskWithCallableObject()
+{
+    QCOMPARE(task(std::plus<int>())
+                 .withArguments(40, 2)
+                 .spawn()
+                 .result(),
+             42);
+}
+
+void tst_QtConcurrentTask::taskWithLambda()
+{
+    QCOMPARE(task([]{ return 42; }).spawn().result(), 42);
+}
+
+void tst_QtConcurrentTask::taskWithArguments()
+{
+    auto result = task([](int arg1, int arg2){ return arg1 + arg2; })
+                      .withArguments(40, 2)
+                      .spawn()
+                      .result();
+    QCOMPARE(result, 42);
+}
+
+void tst_QtConcurrentTask::useCustomThreadPool()
+{
+    QThreadPool pool;
+
+    int result = 0;
+    task([&]{ result = 42; }).onThreadPool(pool).spawn().waitForFinished();
+
+    QCOMPARE(result, 42);
+}
+
+void tst_QtConcurrentTask::setPriority_data()
+{
+    QTest::addColumn<bool>("runWithPromise");
+
+    QTest::addRow("without promise") << false;
+    QTest::addRow("with promise") << true;
+}
+
+void tst_QtConcurrentTask::setPriority()
+{
+    QFETCH(bool, runWithPromise);
+
+    QThreadPool pool;
+    pool.setMaxThreadCount(1);
+
+    QSemaphore sem;
+
+    QList<QFuture<void>> futureResults;
+    futureResults << task([&]{ sem.acquire(); })
+                         .onThreadPool(pool)
+                         .spawn();
+
+    const int tasksCount = 10;
+    QList<int> priorities(tasksCount);
+    std::iota(priorities.begin(), priorities.end(), 1);
+    auto seed = std::random_device {}();
+    std::shuffle(priorities.begin(), priorities.end(), std::default_random_engine(seed));
+
+    qDebug() << "Generated priorities list" << priorities << "using seed" << seed;
+
+    QList<int> actual;
+    for (int priority : priorities) {
+        if (runWithPromise) {
+            futureResults << task([priority, &actual] (QPromise<void> &) { actual << priority; })
+                                 .onThreadPool(pool)
+                                 .withPriority(priority)
+                                 .spawn();
+        } else {
+            futureResults << task([priority, &actual] { actual << priority; })
+                                 .onThreadPool(pool)
+                                 .withPriority(priority)
+                                 .spawn();
+        }
+    }
+
+    sem.release();
+    pool.waitForDone();
+
+    for (const auto &f : futureResults)
+        QVERIFY(f.isFinished());
+
+    QList<int> expected(priorities);
+    std::sort(expected.begin(), expected.end(), std::greater<>());
+
+    QCOMPARE(actual, expected);
+}
+
+void tst_QtConcurrentTask::adjustAllSettings()
+{
+    QThreadPool pool;
+    pool.setMaxThreadCount(1);
+
+    const int priority = 10;
+
+    QList<int> result;
+    auto append = [&](auto &&...args){ (result << ... << args); };
+
+    task(std::move(append))
+        .withArguments(1, 2, 3)
+        .onThreadPool(pool)
+        .withPriority(priority)
+        .spawn()
+        .waitForFinished();
+
+    QCOMPARE(result, QList<int>({ 1, 2, 3 }));
+}
+
+void tst_QtConcurrentTask::ignoreFutureResult()
+{
+    QThreadPool pool;
+
+    std::atomic_int value = 0;
+    for (std::size_t i = 0; i < 10; ++i)
+        task([&value]{ ++value; })
+            .onThreadPool(pool)
+            .spawn(FutureResult::Ignore);
+
+    pool.waitForDone();
+
+    QCOMPARE(value, 10);
+}
+
+void incrementWithPromise(QPromise<int> &promise, int i)
+{
+    promise.addResult(i + 1);
+}
+
+void return0WithPromise(QPromise<int> &promise)
+{
+    promise.addResult(0);
+}
+
+void tst_QtConcurrentTask::withPromise()
+{
+    QCOMPARE(task(&return0WithPromise).spawn().result(), 0);
+    QCOMPARE(task(&return0WithPromise).withPriority(7).spawn().result(), 0);
+    QCOMPARE(task(&incrementWithPromise).withArguments(1).spawn().result(), 2);
+    QCOMPARE(task(&incrementWithPromise).withArguments(1).withPriority(7).spawn().result(), 2);
+}
+
+QTEST_MAIN(tst_QtConcurrentTask)
+#include "tst_qtconcurrenttask.moc"