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This chapter includes:
The QNX High Availability Framework Developer's Guide describes how to build robust high-availability software running on the QNX Neutrino realtime operating system.
The following table may help you find information quickly in this guide:
| If you want to: | Go to: |
|---|---|
| Find the introduction | Introduction |
| Learn about the main components | What's in the High Availability Framework? |
| Understand the benefits of a software-oriented approach to High Availability | The QNX Approach to HA |
| Get an overview of the HAM and Guardian “watchdogs” | Using the High Availability Manager |
| Find out which standard QNX library functions have HA covers | Using the Client Recovery Library |
| Look up a convenience function (e.g. ha_recover()) | Client Recovery Library Reference |
| Look up a HAM API function (e.g. ham_attach()) | HAM API Reference |
| See sample code listings for handling various HA scenarios | The Examples appendix |
| Look up a special term used in this guide | Glossary |
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For an overview of the QNX Neutrino RTOS, see the System Architecture manual in the OS documentation set. |
Throughout this manual, we use certain typographical conventions to distinguish technical terms. In general, the conventions we use conform to those found in IEEE POSIX publications. The following table summarizes our conventions:
| Reference | Example |
|---|---|
| Code examples | if( stream == NULL ) |
| Command options | -lR |
| Commands | make |
| Environment variables | PATH |
| File and pathnames | /dev/null |
| Function names | exit() |
| Keyboard chords | Ctrl-Alt-Delete |
| Keyboard input | something you type |
| Keyboard keys | Enter |
| Program output | login: |
| Programming constants | NULL |
| Programming data types | unsigned short |
| Programming literals | 0xFF, "message string" |
| Variable names | stdin |
| User-interface components | Cancel |
We use an arrow (→) in directions for accessing menu items, like this:
You'll find the Other... menu item under .
We use notes, cautions, and warnings to highlight important messages:
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Notes point out something important or useful. |
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Cautions tell you about commands or procedures that may have unwanted or undesirable side effects. |
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Warnings tell you about commands or procedures that could be dangerous to your files, your hardware, or even yourself. |
In our documentation, we use a forward slash (/) as a delimiter in all pathnames, including those pointing to Windows files.
We also generally follow POSIX/UNIX filesystem conventions.
At the top and bottom of our HTML docs, you'll see some or all of these buttons:
| Use this button: | To move: |
|---|---|
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To the previous part of the document. |
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“Up” in the document:
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To the keyword index. |
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To the next part of the document. |
To obtain technical support for any QNX product, visit the Support + Services area on our website (www.qnx.com). You'll find a wide range of support options, including community forums.
Copyright © 2004–2009, QNX Software Systems GmbH & Co. KG. All rights reserved.
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