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#include <QtTest/QtTest>

#include <qcoreapplication.h>

#include <qthread.h>

#include <qsemaphore.h>

//TESTED_CLASS=

//TESTED_FILES=

class tst_QSemaphore : public QObject

{

    Q_OBJECT

public:

    tst_QSemaphore();

    ~tst_QSemaphore();

private slots:

    void acquire();

    void tryAcquire();

    void tryAcquireWithTimeout_data();

    void tryAcquireWithTimeout();

    void release();

    void available();

    void producerConsumer();

};

static QSemaphore *semaphore = 0;

tst_QSemaphore::tst_QSemaphore()

{ }

tst_QSemaphore::~tst_QSemaphore()

{ }

class ThreadOne : public QThread

{

public:

    ThreadOne() {}

protected:

    void run()

    {

	int i = 0;

	while ( i < 100 ) {

            semaphore->acquire();

	    i++;

            semaphore->release();

	}

    }

};

class ThreadN : public QThread

{

    int N;

public:

    ThreadN(int n) :N(n) { }

protected:

    void run()

    {

	int i = 0;

	while ( i < 100 ) {

            semaphore->acquire(N);

	    i++;

            semaphore->release(N);

	}

    }

};

void tst_QSemaphore::acquire()

{

    {

        // old incrementOne() test

        QVERIFY(!semaphore);

        semaphore = new QSemaphore;

        // make some "thing" available

        semaphore->release();

        ThreadOne t1;

        ThreadOne t2;

        t1.start();

        t2.start();

        QVERIFY(t1.wait(4000));

        QVERIFY(t2.wait(4000));

        delete semaphore;

        semaphore = 0;

    }

    // old incrementN() test

    {

        QVERIFY(!semaphore);

        semaphore = new QSemaphore;

        // make 4 "things" available

        semaphore->release(4);

        ThreadN t1(2);

        ThreadN t2(3);

        t1.start();

        t2.start();

        QVERIFY(t1.wait(4000));

        QVERIFY(t2.wait(4000));

        delete semaphore;

        semaphore = 0;

    }

    QSemaphore semaphore;

    QCOMPARE(semaphore.available(), 0);

    semaphore.release();

    QCOMPARE(semaphore.available(), 1);

    semaphore.release();

    QCOMPARE(semaphore.available(), 2);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 12);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 22);

    semaphore.acquire();

    QCOMPARE(semaphore.available(), 21);

    semaphore.acquire();

    QCOMPARE(semaphore.available(), 20);

    semaphore.acquire(10);

    QCOMPARE(semaphore.available(), 10);

    semaphore.acquire(10);

    QCOMPARE(semaphore.available(), 0);

}

void tst_QSemaphore::tryAcquire()

{

    QSemaphore semaphore;

    QCOMPARE(semaphore.available(), 0);

    semaphore.release();

    QCOMPARE(semaphore.available(), 1);

    QVERIFY(!semaphore.tryAcquire(2));

    QCOMPARE(semaphore.available(), 1);

    semaphore.release();

    QCOMPARE(semaphore.available(), 2);

    QVERIFY(!semaphore.tryAcquire(3));

    QCOMPARE(semaphore.available(), 2);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 12);

    QVERIFY(!semaphore.tryAcquire(100));

    QCOMPARE(semaphore.available(), 12);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 22);

    QVERIFY(!semaphore.tryAcquire(100));

    QCOMPARE(semaphore.available(), 22);

    QVERIFY(semaphore.tryAcquire());

    QCOMPARE(semaphore.available(), 21);

    QVERIFY(semaphore.tryAcquire());

    QCOMPARE(semaphore.available(), 20);

    QVERIFY(semaphore.tryAcquire(10));

    QCOMPARE(semaphore.available(), 10);

    QVERIFY(semaphore.tryAcquire(10));

    QCOMPARE(semaphore.available(), 0);

    // should not be able to acquire more

    QVERIFY(!semaphore.tryAcquire());

    QCOMPARE(semaphore.available(), 0);

    QVERIFY(!semaphore.tryAcquire());

    QCOMPARE(semaphore.available(), 0);

    QVERIFY(!semaphore.tryAcquire(10));

    QCOMPARE(semaphore.available(), 0);

    QVERIFY(!semaphore.tryAcquire(10));

    QCOMPARE(semaphore.available(), 0);

}

void tst_QSemaphore::tryAcquireWithTimeout_data()

{

    QTest::addColumn<int>("timeout");

}

void tst_QSemaphore::tryAcquireWithTimeout()

{

    QFETCH(int, timeout);

    QSemaphore semaphore;

    QTime time;

    QCOMPARE(semaphore.available(), 0);

    semaphore.release();

    QCOMPARE(semaphore.available(), 1);

    time.start();

    QVERIFY(!semaphore.tryAcquire(2, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 1);

    semaphore.release();

    QCOMPARE(semaphore.available(), 2);

    time.start();

    QVERIFY(!semaphore.tryAcquire(3, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 2);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 12);

    time.start();

    QVERIFY(!semaphore.tryAcquire(100, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 12);

    semaphore.release(10);

    QCOMPARE(semaphore.available(), 22);

    time.start();

    QVERIFY(!semaphore.tryAcquire(100, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 22);

    time.start();

    QVERIFY(semaphore.tryAcquire(1, timeout));

    QVERIFY(time.elapsed() <= timeout);

    QCOMPARE(semaphore.available(), 21);

    time.start();

    QVERIFY(semaphore.tryAcquire(1, timeout));

    QVERIFY(time.elapsed() <= timeout);

    QCOMPARE(semaphore.available(), 20);

    time.start();

    QVERIFY(semaphore.tryAcquire(10, timeout));

    QVERIFY(time.elapsed() <= timeout);

    QCOMPARE(semaphore.available(), 10);

    time.start();

    QVERIFY(semaphore.tryAcquire(10, timeout));

    QVERIFY(time.elapsed() <= timeout);

    QCOMPARE(semaphore.available(), 0);

    // should not be able to acquire more

    time.start();

    QVERIFY(!semaphore.tryAcquire(1, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 0);

    time.start();

    QVERIFY(!semaphore.tryAcquire(1, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 0);

    time.start();

    QVERIFY(!semaphore.tryAcquire(10, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 0);

    time.start();

    QVERIFY(!semaphore.tryAcquire(10, timeout));

    QVERIFY(time.elapsed() >= timeout);

    QCOMPARE(semaphore.available(), 0);

}

void tst_QSemaphore::release()

{ DEPENDS_ON("acquire"); }

void tst_QSemaphore::available()

{ DEPENDS_ON("acquire"); }

const char alphabet[] = "ACGTH";

const int AlphabetSize = sizeof(alphabet) - 1;

const int BufferSize = 4096; // GCD of BufferSize and alphabet size must be 1

char buffer[BufferSize];

#ifndef Q_OS_WINCE

const int ProducerChunkSize = 3;

const int ConsumerChunkSize = 7;

const int Multiplier = 10;

#else

const int ProducerChunkSize = 2;

const int ConsumerChunkSize = 5;

const int Multiplier = 3;

#endif

// note: the code depends on the fact that DataSize is a multiple of

// ProducerChunkSize, ConsumerChunkSize, and BufferSize

const int DataSize = ProducerChunkSize * ConsumerChunkSize * BufferSize * Multiplier;

QSemaphore freeSpace(BufferSize);

QSemaphore usedSpace;

class Producer : public QThread

{

public:

    void run();

};

void Producer::run()

{

    for (int i = 0; i < DataSize; ++i) {

        freeSpace.acquire();

        buffer[i % BufferSize] = alphabet[i % AlphabetSize];

        usedSpace.release();

    }

    for (int i = 0; i < DataSize; ++i) {

        if ((i % ProducerChunkSize) == 0)

            freeSpace.acquire(ProducerChunkSize);

        buffer[i % BufferSize] = alphabet[i % AlphabetSize];

        if ((i % ProducerChunkSize) == (ProducerChunkSize - 1))

            usedSpace.release(ProducerChunkSize);

    }

}

class Consumer : public QThread

{

public:

    void run();

};

void Consumer::run()

{

    for (int i = 0; i < DataSize; ++i) {

        usedSpace.acquire();

        QCOMPARE(buffer[i % BufferSize], alphabet[i % AlphabetSize]);

        freeSpace.release();

    }

    for (int i = 0; i < DataSize; ++i) {

        if ((i % ConsumerChunkSize) == 0)

            usedSpace.acquire(ConsumerChunkSize);

        QCOMPARE(buffer[i % BufferSize], alphabet[i % AlphabetSize]);

        if ((i % ConsumerChunkSize) == (ConsumerChunkSize - 1))

            freeSpace.release(ConsumerChunkSize);

    }

}

void tst_QSemaphore::producerConsumer()

{

    Producer producer;

    Consumer consumer;

    producer.start();

    consumer.start();

    producer.wait();

    consumer.wait();

}

QTEST_MAIN(tst_QSemaphore)

#include "tst_qsemaphore.moc"