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Shared Memory Under Linux

Mike Perry

11/9/99

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This document aims to provide an overview of shared memory
under Linux. It coveres both the System V IPC, and BSD mmap().
It is intended for those who have a basic familiarity with
ANSI C. A sample and oversimplified malloc debugger is
provided as an example program.

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1. Introduction

• 1.1 What is Shared Memory?
• 1.2 Types of Shared memory available
• 1.3 General Principles

2. BSD mmap

• 2.1 Synopsis
• 2.2 Overview

3. Examples

4. Writing a malloc debugger

• 4.1 Concepts
• 4.2 Goals
• 4.3 Code

5. System V IPC

• 5.1 Introduction
• 5.2 Common Ground
• 5.3 Shared segments
• 5.4 Message Queues
• 5.5 Semaphores

6. System V vs. BSD

• 6.1 BSD mmap

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