qt5base-lts/examples/threads/semaphores/semaphores.cpp
Oswald Buddenhagen f14e268694 don't erroneously claim that gui support is needed
Change-Id: Ia7b1f02cab9fa0fc9e487ca49d75e85ed0cfee9d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-10-16 17:10:15 +02:00

113 lines
3.2 KiB
C++

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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****************************************************************************/
#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()
{
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
for (int i = 0; i < DataSize; ++i) {
freeBytes.acquire();
buffer[i % BufferSize] = "ACGT"[(int)qrand() % 4];
usedBytes.release();
}
}
};
//! [2]
//! [3]
class Consumer : public QThread
//! [3] //! [4]
{
Q_OBJECT
public:
void run()
{
for (int i = 0; i < DataSize; ++i) {
usedBytes.acquire();
fprintf(stderr, "%c", buffer[i % BufferSize]);
freeBytes.release();
}
fprintf(stderr, "\n");
}
signals:
void stringConsumed(const QString &text);
protected:
bool finish;
};
//! [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"