/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the documentation of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \page ipc.html \title Inter-Process Communication in Qt \brief Inter-Process communication in Qt applications. \ingroup frameworks-technologies Qt provides several ways to implement Inter-Process Communication (IPC) in Qt applications. \section1 TCP/IP The cross-platform \l{QtNetwork} module provides classes that make network programming portable and easy. It offers high-level classes (e.g., QNetworkAccessManager, QFtp) that communicate using specific application-level protocols, and lower-level classes (e.g., QTcpSocket, QTcpServer, QSslSocket) for implementing protocols. \section1 Shared Memory The cross-platform shared memory class, QSharedMemory, provides access to the operating system's shared memory implementation. It allows safe access to shared memory segments by multiple threads and processes. Additionally, QSystemSemaphore can be used to control access to resources shared by the system, as well as to communicate between processes. \section1 D-Bus The \l{QtDBus} module is a Unix-only library you can use to implement IPC using the D-Bus protocol. It extends Qt's \l{signalsandslots.html} {Signals and Slots} mechanism to the IPC level, allowing a signal emitted by one process to be connected to a slot in another process. This \l {Introduction to D-Bus} page has detailed information on how to use the \l{QtDBus} module. \section1 Qt COmmunications Protocol (QCOP) The QCopChannel class implements a protocol for transferring messages between client processes across named channels. QCopChannel is only available in \l{Qt for Embedded Linux}. Like the \l{QtDBus} module, QCOP extends Qt's \l{Signals and Slots} mechanism to the IPC level, allowing a signal emitted by one process to be connected to a slot in another process, but unlike QtDBus, QCOP does not depend on a third party library. */