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    40 ****************************************************************************/

    41 

    42 

    43 #include <QtTest/QtTest>

    44 

    45 #include <qcoreapplication.h>

    46 #include <qmutex.h>

    47 #include <qthread.h>

    48 #include <qwaitcondition.h>

    49 #include "qthreadonce.h"

    50 

    51 //TESTED_CLASS=

    52 //TESTED_FILES=corelib/thread/qthreadonce.h corelib/thread/qthreadonce.cpp

    53 

    54 class tst_QThreadOnce : public QObject

    55 {

    56     Q_OBJECT

    57 

    58 private slots:

    59     void sameThread();

    60     void sameThread_data();

    61     void multipleThreads();

    62 

    63     void nesting();

    64     void reentering();

    65     void exception();

    66 };

    67 

    68 class SingletonObject: public QObject

    69 {

    70     Q_OBJECT

    71 public:

    72     static int runCount;

    73     SingletonObject() { val = 42; ++runCount; }

    74     ~SingletonObject() { }

    75 

    76     QBasicAtomicInt val;

    77 };

    78 

    79 class IncrementThread: public QThread

    80 {

    81 public:

    82     static QBasicAtomicInt runCount;

    83     static QSingleton<SingletonObject> singleton;

    84     QSemaphore &sem1, &sem2;

    85     int &var;

    86 

    87     IncrementThread(QSemaphore *psem1, QSemaphore *psem2, int *pvar, QObject *parent)

    88         : QThread(parent), sem1(*psem1), sem2(*psem2), var(*pvar)

    89         { start(); }

    90 

    91     ~IncrementThread() { wait(); }

    92 

    93 protected:

    94     void run()

    95         {

    96             sem2.release();

    97             sem1.acquire();             // synchronize

    98 

    99             Q_ONCE {

   100                 ++var;

   101             }

   102             runCount.ref();

   103             singleton->val.ref();

   104         }

   105 };

   106 int SingletonObject::runCount = 0;

   107 QBasicAtomicInt IncrementThread::runCount = Q_BASIC_ATOMIC_INITIALIZER(0);

   108 QSingleton<SingletonObject> IncrementThread::singleton;

   109 

   110 void tst_QThreadOnce::sameThread_data()

   111 {

   112     SingletonObject::runCount = 0;

   113     QTest::addColumn<int>("expectedValue");

   114 

   115     QTest::newRow("first") << 42;

   116     QTest::newRow("second") << 43;

   117 }

   118 

   119 void tst_QThreadOnce::sameThread()

   120 {

   121     static int controlVariable = 0;

   122     Q_ONCE {

   123         QCOMPARE(controlVariable, 0);

   124         ++controlVariable;

   125     }

   126     QCOMPARE(controlVariable, 1);

   127 

   128     static QSingleton<SingletonObject> s;

   129     QTEST((int)s->val, "expectedValue");

   130     s->val.ref();

   131 

   132     QCOMPARE(SingletonObject::runCount, 1);

   133 }

   134 

   135 void tst_QThreadOnce::multipleThreads()

   136 {

   137 #if defined(Q_OS_WINCE) || defined(Q_OS_VXWORKS) || defined(Q_OS_SYMBIAN)

   138     const int NumberOfThreads = 20;

   139 #else

   140     const int NumberOfThreads = 100;

   141 #endif

   142     int controlVariable = 0;

   143     QSemaphore sem1, sem2(NumberOfThreads);

   144 

   145     QObject *parent = new QObject;

   146     for (int i = 0; i < NumberOfThreads; ++i)

   147         new IncrementThread(&sem1, &sem2, &controlVariable, parent);

   148 

   149     QCOMPARE(controlVariable, 0); // nothing must have set them yet

   150     SingletonObject::runCount = 0;

   151     IncrementThread::runCount = 0;

   152 

   153     // wait for all of them to be ready

   154     sem2.acquire(NumberOfThreads);

   155     // unleash the threads

   156     sem1.release(NumberOfThreads);

   157 

   158     // wait for all of them to terminate:

   159     delete parent;

   160 

   161     QCOMPARE(controlVariable, 1);

   162     QCOMPARE((int)IncrementThread::runCount, NumberOfThreads);

   163     QCOMPARE(SingletonObject::runCount, 1);

   164 }

   165 

   166 void tst_QThreadOnce::nesting()

   167 {

   168     int variable = 0;

   169     Q_ONCE {

   170         Q_ONCE {

   171             ++variable;

   172         }

   173     }

   174 

   175     QVERIFY(variable == 1);

   176 }

   177 

   178 static void reentrant(int control, int &counter)

   179 {

   180     Q_ONCE {

   181         if (counter)

   182             reentrant(--control, counter);

   183         ++counter;

   184     }

   185     static QSingleton<SingletonObject> s;

   186     s->val.ref();

   187 }

   188 

   189 void tst_QThreadOnce::reentering()

   190 {

   191     const int WantedRecursions = 5;

   192     int count = 0;

   193     SingletonObject::runCount = 0;

   194     reentrant(WantedRecursions, count);

   195 

   196     // reentrancy is undefined behavior:

   197     QVERIFY(count == 1 || count == WantedRecursions);

   198     QCOMPARE(SingletonObject::runCount, 1);

   199 }

   200 

   201 #if !defined(QT_NO_EXCEPTIONS)

   202 static void exception_helper(int &val)

   203 {

   204     Q_ONCE {

   205         if (val++ == 0) throw 0;

   206     }

   207 }

   208 #endif

   209 

   210 void tst_QThreadOnce::exception()

   211 {

   212 #if defined(QT_NO_EXCEPTIONS)

   213     QSKIP("Compiled without exceptions, skipping test", SkipAll);

   214 #else

   215     int count = 0;

   216 

   217     try {

   218         exception_helper(count);

   219     } catch (...) {

   220         // nothing

   221     }

   222     QCOMPARE(count, 1);

   223 

   224     try {

   225         exception_helper(count);

   226     } catch (...) {

   227         QVERIFY2(false, "Exception shouldn't have been thrown...");

   228     }

   229     QCOMPARE(count, 2);

   230 #endif

   231 }

   232 

   233 QTEST_MAIN(tst_QThreadOnce)

   234 #include "tst_qthreadonce.moc"