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-rw-r--r--examples/corelib/threads/waitconditions/waitconditions.cpp119
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"