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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtCore>
#include <stdio.h>
#include <stdlib.h>
//! [0]
const int DataSize = 100000;
const int BufferSize = 8192;
char buffer[BufferSize];
QWaitCondition bufferNotEmpty;
QWaitCondition bufferNotFull;
QMutex mutex;
int numUsedBytes = 0;
//! [0]
//! [1]
class Producer : public QThread
//! [1] //! [2]
{
public:
Producer(QObject *parent = NULL) : QThread(parent)
{
}
void run() override
{
for (int i = 0; i < DataSize; ++i) {
mutex.lock();
if (numUsedBytes == BufferSize)
bufferNotFull.wait(&mutex);
mutex.unlock();
buffer[i % BufferSize] = "ACGT"[QRandomGenerator::global()->bounded(4)];
mutex.lock();
++numUsedBytes;
bufferNotEmpty.wakeAll();
mutex.unlock();
}
}
};
//! [2]
//! [3]
class Consumer : public QThread
//! [3] //! [4]
{
Q_OBJECT
public:
Consumer(QObject *parent = NULL) : QThread(parent)
{
}
void run() override
{
for (int i = 0; i < DataSize; ++i) {
mutex.lock();
if (numUsedBytes == 0)
bufferNotEmpty.wait(&mutex);
mutex.unlock();
fprintf(stderr, "%c", buffer[i % BufferSize]);
mutex.lock();
--numUsedBytes;
bufferNotFull.wakeAll();
mutex.unlock();
}
fprintf(stderr, "\n");
}
signals:
void stringConsumed(const QString &text);
};
//! [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 "waitconditions.moc"
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