Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
Book Image

The Go Workshop

By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1. Variables and Operators
2. Logic and Loops

Race Conditions

One important thing to consider is that whenever we run multiple functions concurrently, we have no guarantee in what order each instruction in each function will be performed. In many architectures, this is not a problem. Some functions are not connected in any way with other functions, and whatever a function does in its routine does not affect the actions performed in other routines. This is, however, not always true. The first situation we can think of is when some functions need to share the same parameter. Some functions will just read from this parameter, while others will write to this parameter. As we do not know which operation will run first, there is a high likelihood that one function will override the value updated by another function. Let's see an example that explains this situation:

func next(v *int) {
  c := *v
  *v = c+1

This function takes a pointer to an integer as a parameter. It is a pointer because we want to...