This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs.

About This Guide

The System Architecture guide accompanies the QNX Neutrino realtime OS and is intended for both application developers and end-users.

The guide describes the philosophy of QNX Neutrino and the architecture used to robustly implement the OS. It covers message-passing services, followed by the details of the microkernel, the process manager, resource managers, the Photon microGUI, and other aspects of QNX Neutrino.

Note that certain features of the OS as described in this guide may still be under development for a given release.

For the latest news and information on any QNX product, visit our website (www.qnx.com). You'll find links to many useful areas -- software downloads, featured articles by developers, newsgroups, technical support options, and more.

The following table may help you find information quickly:

To find out about:	Go to:
OS design goals; message-passing IPC	The Philosophy of QNX Neutrino
System services	The QNX Neutrino Microkernel
System event monitoring	The Instrumented Microkernel
Working on a system with more than one processor	Multicore Processing
Memory management, pathname management, etc.	Process Manager
Shared objects	Dynamic Linking
Device drivers	Resource Managers
Image, RAM, QNX 4, DOS, CD-ROM, Flash, NFS, CIFS, Ext2 filesystems	Filesystems
Serial and parallel devices	Character I/O
Network subsystem	Networking Architecture
Native QNX Neutrino networking	Native Networking (Qnet)
TCP/IP implementation	TCP/IP Networking
Fault recovery	High Availability
Power-aware systems	Power Management
Sharing resources among competing processes	Adaptive Partitioning
Graphical environment	The Photon microGUI
Terms used in QNX documentation	Glossary