1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include <QtCore>
52
53#include <stdio.h>
54#include <stdlib.h>
55
56//! [0]
57const int DataSize = 100000;
58
59const int BufferSize = 8192;
60char buffer[BufferSize];
61
62QWaitCondition bufferNotEmpty;
63QWaitCondition bufferNotFull;
64QMutex mutex;
65int numUsedBytes = 0;
66//! [0]
67
68//! [1]
69class Producer : public QThread
70//! [1] //! [2]
71{
72public:
73 Producer(QObject *parent = NULL) : QThread(parent)
74 {
75 }
76
77 void run() override
78 {
79 for (int i = 0; i < DataSize; ++i) {
80 mutex.lock();
81 if (numUsedBytes == BufferSize)
82 bufferNotFull.wait(&mutex);
83 mutex.unlock();
84
85 buffer[i % BufferSize] = "ACGT"[QRandomGenerator::global()->bounded(4)];
86
87 mutex.lock();
88 ++numUsedBytes;
89 bufferNotEmpty.wakeAll();
90 mutex.unlock();
91 }
92 }
93};
94//! [2]
95
96//! [3]
97class Consumer : public QThread
98//! [3] //! [4]
99{
100 Q_OBJECT
101public:
102 Consumer(QObject *parent = NULL) : QThread(parent)
103 {
104 }
105
106 void run() override
107 {
108 for (int i = 0; i < DataSize; ++i) {
109 mutex.lock();
110 if (numUsedBytes == 0)
111 bufferNotEmpty.wait(&mutex);
112 mutex.unlock();
113
114 fprintf(stderr, "%c", buffer[i % BufferSize]);
115
116 mutex.lock();
117 --numUsedBytes;
118 bufferNotFull.wakeAll();
119 mutex.unlock();
120 }
121 fprintf(stderr, "\n");
122 }
123
124signals:
125 void stringConsumed(const QString &text);
126};
127//! [4]
128
129
130//! [5]
131int main(int argc, char *argv[])
132//! [5] //! [6]
133{
134 QCoreApplication app(argc, argv);
135 Producer producer;
136 Consumer consumer;
137 producer.start();
138 consumer.start();
139 producer.wait();
140 consumer.wait();
141 return 0;
142}
143//! [6]
144
145#include "waitconditions.moc"
146