diff options
Diffstat (limited to 'examples/corelib/threads/waitconditions/waitconditions.cpp')
-rw-r--r-- | examples/corelib/threads/waitconditions/waitconditions.cpp | 119 |
1 files changed, 41 insertions, 78 deletions
diff --git a/examples/corelib/threads/waitconditions/waitconditions.cpp b/examples/corelib/threads/waitconditions/waitconditions.cpp index 963ee03a76..bdc24acd8c 100644 --- a/examples/corelib/threads/waitconditions/waitconditions.cpp +++ b/examples/corelib/threads/waitconditions/waitconditions.cpp @@ -1,68 +1,28 @@ -/**************************************************************************** -** -** 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> +// Copyright (C) 2016 The Qt Company Ltd. +// Copyright (C) 2022 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com> +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include <QCoreApplication> +#include <QMutex> +#include <QMutexLocker> +#include <QObject> +#include <QRandomGenerator> +#include <QThread> +#include <QWaitCondition> #include <stdio.h> #include <stdlib.h> //! [0] -const int DataSize = 100000; +constexpr int DataSize = 100000; +constexpr int BufferSize = 8192; -const int BufferSize = 8192; +QMutex mutex; // protects the buffer and the counter char buffer[BufferSize]; +int numUsedBytes; QWaitCondition bufferNotEmpty; QWaitCondition bufferNotFull; -QMutex mutex; -int numUsedBytes = 0; //! [0] //! [1] @@ -70,24 +30,28 @@ class Producer : public QThread //! [1] //! [2] { public: - Producer(QObject *parent = NULL) : QThread(parent) + explicit Producer(QObject *parent = nullptr) + : QThread(parent) { } +private: void run() override { for (int i = 0; i < DataSize; ++i) { - mutex.lock(); - if (numUsedBytes == BufferSize) - bufferNotFull.wait(&mutex); - mutex.unlock(); + { + const QMutexLocker locker(&mutex); + while (numUsedBytes == BufferSize) + bufferNotFull.wait(&mutex); + } buffer[i % BufferSize] = "ACGT"[QRandomGenerator::global()->bounded(4)]; - mutex.lock(); - ++numUsedBytes; - bufferNotEmpty.wakeAll(); - mutex.unlock(); + { + const QMutexLocker locker(&mutex); + ++numUsedBytes; + bufferNotEmpty.wakeAll(); + } } } }; @@ -97,32 +61,32 @@ public: class Consumer : public QThread //! [3] //! [4] { - Q_OBJECT public: - Consumer(QObject *parent = NULL) : QThread(parent) + explicit Consumer(QObject *parent = nullptr) + : QThread(parent) { } +private: void run() override { for (int i = 0; i < DataSize; ++i) { - mutex.lock(); - if (numUsedBytes == 0) - bufferNotEmpty.wait(&mutex); - mutex.unlock(); + { + const QMutexLocker locker(&mutex); + while (numUsedBytes == 0) + bufferNotEmpty.wait(&mutex); + } fprintf(stderr, "%c", buffer[i % BufferSize]); - mutex.lock(); - --numUsedBytes; - bufferNotFull.wakeAll(); - mutex.unlock(); + { + const QMutexLocker locker(&mutex); + --numUsedBytes; + bufferNotFull.wakeAll(); + } } fprintf(stderr, "\n"); } - -signals: - void stringConsumed(const QString &text); }; //! [4] @@ -142,4 +106,3 @@ int main(int argc, char *argv[]) } //! [6] -#include "waitconditions.moc" |