Book Image

Embedded Programming with Modern C++ Cookbook

By : Igor Viarheichyk
Book Image

Embedded Programming with Modern C++ Cookbook

By: Igor Viarheichyk

Overview of this book

Developing applications for embedded systems may seem like a daunting task as developers face challenges related to limited memory, high power consumption, and maintaining real-time responses. This book is a collection of practical examples to explain how to develop applications for embedded boards and overcome the challenges that you may encounter while developing. The book will start with an introduction to embedded systems and how to set up the development environment. By teaching you to build your first embedded application, the book will help you progress from the basics to more complex concepts, such as debugging, logging, and profiling. Moving ahead, you will learn how to use specialized memory and custom allocators. From here, you will delve into recipes that will teach you how to work with the C++ memory model, atomic variables, and synchronization. The book will then take you through recipes on inter-process communication, data serialization, and timers. Finally, you will cover topics such as error handling and guidelines for real-time systems and safety-critical systems. By the end of this book, you will have become proficient in building robust and secure embedded applications with C++.
Table of Contents (17 chapters)

Using atomic variables

Atomic variables are named as such because they cannot be read or written partially. Compare, for example, the Point and int data types:

struct Point {
int x, y;

Point p{0, 0};
int b = 0;

p = {10, 10};
b = 10;

In this example, modification of the p variable is equivalent to two assignments:

p.x = 10;
p.y = 10;

This means that any concurrent thread reading the p variable can get partially modified data, such as x=10, y=0, which can lead to incorrect calculations that are hard to detect and hard to reproduce. That is why access to such data types should be synchronized.

How about the b variable? Can it be modified partially? The answer is: yes, depending on the platform. However, C++ provides a set of data types and templates to ensure that a variable changes all at once, as a whole, atomically.

In this recipe, we will learn how...