/******************************************************************************** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.**** This file is part of the example classes of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#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(){    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();    }}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;}