REACT^™ Real-Time for Linux ^® Programmer Guide

Table of Contents

New Features in this Guide

About This Guide

Audience

What This Guide Contains

Related Publications and Sites

Conventions

Obtaining Publications

Reader Comments

1. Introduction

Real-Time Programs

Real-Time Applications

REACT™ Features

REACT Requirements

REACT RPMs

2. Linux and REACT Support for Real-Time Programs

Kernel Facilities

Frame Scheduler

Real-Time Clocks and Timers

Interchassis Communication

3. External Interrupts

Abstraction Layer

Low-level Driver Template

Example: SGI PCIE-RT Real-Time Interrupt Card

4. CPU Workload

Using Priorities and Scheduling Queues

Minimizing Overhead Work

Understanding Interrupt Response Time

Minimizing Interrupt Response Time

5. Using the Frame Scheduler

Frame Scheduler Concepts

Selecting a Time Base

Using the Scheduling Disciplines

Using Multiple Consecutive Minor Frames

Designing an Application for the Frame Scheduler

Preparing the System

Implementing a Single Frame Scheduler

Implementing Synchronized Schedulers

Handling Frame Scheduler Exceptions

Using Signals Under the Frame Scheduler

Using Timers with the Frame Scheduler

6. Disk I/O Optimization

Memory-Mapped I/O

Asynchronous I/O

7. PCI Devices

8. User-Level Interrupts

Overview of ULI

Setting Up ULI

9. REACT System Configuration

react Command Overview

react Command-Line Syntax

Initially Configuring REACT

Changing the Configuration

Disabling REACT

Reenabling REACT

Changing Specific Kernel Command-Line Options

Specifying Permissions

Showing the Configuration

Getting Trace Information

Running a Process on a Real-Time CPU

Executing Commands on a Real-Time CPU

10. Using the REACT Library

REACT Library Routines

Accessing REACT Library Routines

Installing the pam_capability Package

Example Code Using the REACT Library Routines

11. SLES LTTng

Installing LTTng on SLES

LTTng Documentation for SLES

12. Troubleshooting

Diagnostic Tools

Problem Removing /rtcpus

A. libreact API Example

B. High-Resolution Timer Example

C. Sample User-Level Interrupt Programs

uli_sample Sample Program

uli_ei Sample Program

Glossary

Index