| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
| ** * Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** * Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in |
| ** the documentation and/or other materials provided with the |
| ** distribution. |
| ** * Neither the name of The Qt Company Ltd nor the names of its |
| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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] |
| class Producer : public QThread |
| //! [1] //! [2] |
| { |
| public: |
| void run() override |
| { |
| for (int i = 0; i < DataSize; ++i) { |
| freeBytes.acquire(); |
| buffer[i % BufferSize] = "ACGT"[QRandomGenerator::global()->bounded(4)]; |
| usedBytes.release(); |
| } |
| } |
| }; |
| //! [2] |
| |
| //! [3] |
| class Consumer : public QThread |
| //! [3] //! [4] |
| { |
| Q_OBJECT |
| public: |
| void run() override |
| { |
| 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] |
| |
| #include "semaphores.moc" |