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semaphores.cpp

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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the examples of the Qt Toolkit.
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#include <QtCore>

#include <stdio.h>
#include <stdlib.h>

//! [0]
const int DataSize = 100000;
const int BufferSize = 8192;
char buffer[BufferSize];

QSemaphore freeBytes(BufferSize);
QSemaphore usedBytes;
//! [0]

//! [1]
00057 class Producer : public QThread
//! [1] //! [2]
{
public:
    void run();
};

00064 void Producer::run()
{
    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
    for (int i = 0; i < DataSize; ++i) {
        freeBytes.acquire();
        buffer[i % BufferSize] = "ACGT"[(int)qrand() % 4];
        usedBytes.release();
    }
}
//! [2]

//! [3]
00076 class Consumer : public QThread
//! [3] //! [4]
{
public:
    void run();
};

00083 void Consumer::run()
{
    for (int i = 0; i < DataSize; ++i) {
        usedBytes.acquire();
        fprintf(stderr, "%c", buffer[i % BufferSize]);
        freeBytes.release();
    }
    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]

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