Move QtConcurrent into its own module

Task-number: QTBUG-20892

Change-Id: I614500aafb6428915509983608bbb0ade4e4f016
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

3 files changed, 315 insertions, 0 deletions

diff --git a/tests/auto/concurrent/qtconcurrentiteratekernel/.gitignore b/tests/auto/concurrent/qtconcurrentiteratekernel/.gitignore
new file mode 100644
index 0000000000..ac5dec4db6
--- /dev/null
+++ b/tests/auto/concurrent/qtconcurrentiteratekernel/.gitignore
@@ -0,0 +1 @@
+tst_qtconcurrentiteratekernel
diff --git a/tests/auto/concurrent/qtconcurrentiteratekernel/qtconcurrentiteratekernel.pro b/tests/auto/concurrent/qtconcurrentiteratekernel/qtconcurrentiteratekernel.pro
new file mode 100644
index 0000000000..4cfebc0e3d
--- /dev/null
+++ b/tests/auto/concurrent/qtconcurrentiteratekernel/qtconcurrentiteratekernel.pro
@@ -0,0 +1,4 @@
+CONFIG += testcase parallel_test
+TARGET = tst_qtconcurrentiteratekernel
+QT = core testlib concurrent
+SOURCES = tst_qtconcurrentiteratekernel.cpp
diff --git a/tests/auto/concurrent/qtconcurrentiteratekernel/tst_qtconcurrentiteratekernel.cpp b/tests/auto/concurrent/qtconcurrentiteratekernel/tst_qtconcurrentiteratekernel.cpp
new file mode 100644
index 0000000000..46562b5eb0
--- /dev/null
+++ b/tests/auto/concurrent/qtconcurrentiteratekernel/tst_qtconcurrentiteratekernel.cpp
@@ -0,0 +1,310 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <QThread>
+
+struct TestIterator
+{
+    TestIterator(int i)
+    :i(i) { }
+
+    int operator-(const TestIterator &other)
+    {
+        return i - other.i;
+    }
+
+    TestIterator& operator++()
+    {
+        ++i;
+        return *this;
+    }
+
+    bool operator!=(const TestIterator &other) const
+    {
+        return i != other.i;
+    }
+
+    int i;
+};
+
+#include <qiterator.h>
+#ifndef QT_NO_STL
+namespace std {
+template <>
+struct iterator_traits<TestIterator>
+{
+    typedef random_access_iterator_tag iterator_category;
+};
+
+int distance(TestIterator &a, TestIterator &b)
+{
+    return b - a;
+}
+
+}
+#endif
+
+#include <qtconcurrentiteratekernel.h>
+#include <QtTest/QtTest>
+
+using namespace QtConcurrent;
+
+class tst_QtConcurrentIterateKernel: public QObject
+{
+    Q_OBJECT
+private slots:
+    // "for" iteration tests:
+    void instantiate();
+    void cancel();
+    void stresstest();
+    void noIterations();
+    void throttling();
+#ifndef QT_NO_STL
+    void blockSize();
+    void multipleResults();
+#endif
+};
+
+QAtomicInt iterations;
+class PrintFor : public IterateKernel<TestIterator, void>
+{
+public:
+    PrintFor(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, void>(begin, end) { iterations.store(0); }
+    bool runIterations(TestIterator/*beginIterator*/, int begin, int end, void *)
+    {
+        iterations.fetchAndAddRelaxed(end - begin);
+#ifdef PRINT
+        qDebug() << QThread::currentThread() << "iteration" << begin <<  "to" << end << "(exclusive)";
+#endif
+        return false;
+    }
+    bool runIteration(TestIterator it, int index , void *result)
+    { 
+        return runIterations(it, index, index + 1, result);
+    }
+
+};
+
+class SleepPrintFor : public IterateKernel<TestIterator, void>
+{
+public:
+    SleepPrintFor(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, void>(begin, end) { iterations.store(0); }
+    inline bool runIterations(TestIterator/*beginIterator*/, int begin, int end, void *)
+    {
+        QTest::qSleep(200);
+        iterations.fetchAndAddRelaxed(end - begin);
+#ifdef PRINT
+        qDebug() << QThread::currentThread() << "iteration" << begin <<  "to" << end << "(exclusive)";
+#endif
+        return false;
+    }
+    bool runIteration(TestIterator it, int index , void *result)
+    { 
+        return runIterations(it, index, index + 1, result);
+    }
+};
+
+
+void tst_QtConcurrentIterateKernel::instantiate()
+{
+    startThreadEngine(new PrintFor(0, 40)).startBlocking();
+    QCOMPARE(iterations.load(), 40);
+}
+
+void tst_QtConcurrentIterateKernel::cancel()
+{
+    {
+        QFuture<void> f = startThreadEngine(new SleepPrintFor(0, 40)).startAsynchronously();
+        f.cancel();
+        f.waitForFinished();
+        QVERIFY(f.isCanceled());
+        QVERIFY(iterations.load() <= QThread::idealThreadCount()); // the threads might run one iteration each before they are canceled.
+    }
+}
+
+QAtomicInt counter;
+class CountFor : public IterateKernel<TestIterator, void>
+{
+public:
+    CountFor(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, void>(begin, end) { iterations.store(0); }
+    inline bool runIterations(TestIterator/*beginIterator*/, int begin, int end, void *)
+    {
+        counter.fetchAndAddRelaxed(end - begin);
+        return false;
+    }
+    bool runIteration(TestIterator it, int index , void *result)
+    { 
+        return runIterations(it, index, index + 1, result);
+    }
+};
+
+void tst_QtConcurrentIterateKernel::stresstest()
+{
+    const int iterations = 1000;
+    const int times = 50;
+    for (int i = 0; i < times; ++i) {
+        counter.store(0);
+        CountFor f(0, iterations);
+        f.startBlocking();
+        QCOMPARE(counter.load(), iterations);
+    }
+}
+
+void tst_QtConcurrentIterateKernel::noIterations()
+{
+    const int times = 20000;
+    for (int i = 0; i < times; ++i)
+        startThreadEngine(new IterateKernel<TestIterator, void>(0, 0)).startBlocking();
+}
+
+QMutex threadsMutex;
+QSet<QThread *> threads;
+class ThrottleFor : public IterateKernel<TestIterator, void>
+{
+public:
+    // this class throttles between iterations 100 and 200,
+    // and then records how many threads that run between
+    // iterations 140 and 160.
+    ThrottleFor(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, void>(begin, end) { iterations.store(0); throttling = false; }
+    inline bool runIterations(TestIterator/*beginIterator*/, int begin, int end, void *)
+    {
+        if (200 >= begin && 200 < end) {
+            throttling = false;
+        }
+
+        iterations.fetchAndAddRelaxed(end - begin);
+
+        QThread *thread = QThread::currentThread();
+
+        if (begin > 140 && end < 160) {
+            QMutexLocker locker(&threadsMutex);
+            threads.insert(thread);
+        }
+
+        if (100 >= begin && 100 < end) {
+            throttling = true;
+        }
+        
+        QTest::qWait(1);
+
+        return false;
+    }
+    bool runIteration(TestIterator it, int index , void *result)
+    { 
+        return runIterations(it, index, index + 1, result);
+    }
+
+    bool shouldThrottleThread()
+    {
+       const int load = iterations.load();
+       return (load > 100 && load < 200);
+    }
+    bool throttling;
+};
+
+void tst_QtConcurrentIterateKernel::throttling()
+{
+    const int totalIterations = 400;
+    iterations.store(0);
+
+    threads.clear();
+
+    ThrottleFor f(0, totalIterations);
+    f.startBlocking();
+
+    QCOMPARE(iterations.load(), totalIterations);
+
+
+    QCOMPARE(threads.count(), 1);
+}
+
+
+int peakBlockSize = 0;
+class BlockSizeRecorder : public IterateKernel<TestIterator, void>
+{
+public:
+    BlockSizeRecorder(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, void>(begin, end) { }
+    inline bool runIterations(TestIterator, int begin, int end, void *)
+    {
+        peakBlockSize = qMax(peakBlockSize, end - begin);
+        return false;
+    }
+};
+
+// Missing stl iterators prevent correct block size calculation.
+#ifndef QT_NO_STL
+void tst_QtConcurrentIterateKernel::blockSize()
+{
+    const int expectedMinimumBlockSize = 1024 / QThread::idealThreadCount();
+    BlockSizeRecorder(0, 10000).startBlocking();
+    if (peakBlockSize < expectedMinimumBlockSize)
+        qDebug() << "block size" << peakBlockSize;
+    QVERIFY(peakBlockSize >= expectedMinimumBlockSize);
+}
+#endif
+
+class MultipleResultsFor : public IterateKernel<TestIterator, int>
+{
+public:
+    MultipleResultsFor(TestIterator begin, TestIterator end) : IterateKernel<TestIterator, int>(begin, end) { }
+    inline bool runIterations(TestIterator, int begin, int end, int *results)
+    {
+        for (int i = begin; i < end; ++i)
+            results[i - begin] = i;
+        return true;
+    }
+};
+
+// Missing stl iterators prevent correct summation.
+#ifndef QT_NO_STL
+void tst_QtConcurrentIterateKernel::multipleResults()
+{
+    QFuture<int> f = startThreadEngine(new MultipleResultsFor(0, 10)).startAsynchronously();
+    QCOMPARE(f.results().count() , 10);
+    QCOMPARE(f.resultAt(0), 0);
+    QCOMPARE(f.resultAt(5), 5);
+    QCOMPARE(f.resultAt(9), 9);
+    f.waitForFinished();
+}
+#endif
+
+QTEST_MAIN(tst_QtConcurrentIterateKernel)
+
+#include "tst_qtconcurrentiteratekernel.moc"