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semaphores.cpp Example File
threads/semaphores/semaphores.cpp

    #include <QtCore>

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

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

    QSemaphore freeBytes(BufferSize);
    QSemaphore usedBytes;

    class Producer : public QThread
    {
    public:
        void run();
    };

    void Producer::run()
    {
        for (int i = 0; i < DataSize; ++i) {
            freeBytes.acquire();
            buffer[i % BufferSize] = "ACGT"[(int)rand() % 4];
            usedBytes.release();
        }
    }

    class Consumer : public QThread
    {
    public:
        void run();
    };

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

    int main(int argc, char *argv[])
    {
        QCoreApplication app(argc, argv);
        Producer producer;
        Consumer consumer;
        producer.start();
        consumer.start();
        producer.wait();
        consumer.wait();
        return 0;
    }


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Qt 4.0.0-b2