1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QtCore>

    43 

    44 #include <stdio.h>

    45 #include <stdlib.h>

    46 

    47 //! [0]

    48 const int DataSize = 100000;

    49 const int BufferSize = 8192;

    50 char buffer[BufferSize];

    51 

    52 QWaitCondition bufferNotEmpty;

    53 QWaitCondition bufferNotFull;

    54 QMutex mutex;

    55 int numUsedBytes = 0;

    56 //! [0]

    57 

    58 //! [1]

    59 class Producer : public QThread

    60 //! [1] //! [2]

    61 {

    62 public:

    63     void run();

    64 };

    65 

    66 void Producer::run()

    67 {

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

    69     

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

    71         mutex.lock();

    72         if (numUsedBytes == BufferSize)

    73             bufferNotFull.wait(&mutex);

    74         mutex.unlock();

    75 

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

    77 

    78         mutex.lock();

    79         ++numUsedBytes;

    80         bufferNotEmpty.wakeAll();

    81         mutex.unlock();

    82     }

    83 }

    84 //! [2]

    85 

    86 //! [3]

    87 class Consumer : public QThread

    88 //! [3] //! [4]

    89 {

    90 public:

    91     void run();

    92 };

    93 

    94 void Consumer::run()

    95 {

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

    97         mutex.lock();

    98         if (numUsedBytes == 0)

    99             bufferNotEmpty.wait(&mutex);

   100         mutex.unlock();

   101 

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

   103 

   104         mutex.lock();

   105         --numUsedBytes;

   106         bufferNotFull.wakeAll();

   107         mutex.unlock();

   108     }

   109     fprintf(stderr, "\n");

   110 }

   111 //! [4]

   112 

   113 //! [5]

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

   115 //! [5] //! [6]

   116 {

   117     QCoreApplication app(argc, argv);

   118     Producer producer;

   119     Consumer consumer;

   120     producer.start();

   121     consumer.start();

   122     producer.wait();

   123     consumer.wait();

   124     return 0;

   125 }

   126 //! [6]