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#include <QtCore>

#include <stdio.h>

#include <stdlib.h>

//! [0]

const int DataSize = 100000;

const int BufferSize = 8192;

char buffer[BufferSize];

QWaitCondition bufferNotEmpty;

QWaitCondition bufferNotFull;

QMutex mutex;

int numUsedBytes = 0;

//! [0]

//! [1]

class Producer : public QThread

//! [1] //! [2]

{

public:

    void run();

};

void Producer::run()

{

    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

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

        mutex.lock();

        if (numUsedBytes == BufferSize)

            bufferNotFull.wait(&mutex);

        mutex.unlock();

        buffer[i % BufferSize] = "ACGT"[(int)qrand() % 4];

        mutex.lock();

        ++numUsedBytes;

        bufferNotEmpty.wakeAll();

        mutex.unlock();

    }

}

//! [2]

//! [3]

class Consumer : public QThread

//! [3] //! [4]

{

public:

    void run();

};

void Consumer::run()

{

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

        mutex.lock();

        if (numUsedBytes == 0)

            bufferNotEmpty.wait(&mutex);

        mutex.unlock();

        fprintf(stderr, "%c", buffer[i % BufferSize]);

        mutex.lock();

        --numUsedBytes;

        bufferNotFull.wakeAll();

        mutex.unlock();

    }

    fprintf(stderr, "\n");

}

//! [4]

//! [5]

int main(int argc, char *argv[])

//! [5] //! [6]

{

    QCoreApplication app(argc, argv);

    Producer producer;

    Consumer consumer;

    producer.start();

    consumer.start();

    producer.wait();

    consumer.wait();

    return 0;

}

//! [6]