Book Image

Extreme C

By : Kamran Amini
5 (1)
Book Image

Extreme C

5 (1)
By: Kamran Amini

Overview of this book

There’s a lot more to C than knowing the language syntax. The industry looks for developers with a rigorous, scientific understanding of the principles and practices. Extreme C will teach you to use C’s advanced low-level power to write effective, efficient systems. This intensive, practical guide will help you become an expert C programmer. Building on your existing C knowledge, you will master preprocessor directives, macros, conditional compilation, pointers, and much more. You will gain new insight into algorithm design, functions, and structures. You will discover how C helps you squeeze maximum performance out of critical, resource-constrained applications. C still plays a critical role in 21st-century programming, remaining the core language for precision engineering, aviations, space research, and more. This book shows how C works with Unix, how to implement OO principles in C, and fully covers multi-processing. In Extreme C, Amini encourages you to think, question, apply, and experiment for yourself. The book is essential for anybody who wants to take their C to the next level.
Table of Contents (23 chapters)

Example of race condition

For our second example, we're going to look at a more problematic scenario. Example 15.2, shown in Code Box 15-3, shows just how interleavings happen and how we cannot reliably predict the final output of the example in practice, mainly because of the non-deterministic nature of concurrent systems. The example involves a program that creates three threads at almost the same time, and each of them prints a different string.

The final output of the following code contains the strings printed by three different threads but in an unpredictable order. If the invariant constraint (introduced in the previous chapter) for the following example was to see the strings in a specific order in the output, the following code would have failed at satisfying that constraint, mainly because of the unpredictable interleavings. Let's look at the following code box:

#include <stdio.h>
#include <stdlib.h>
// The POSIX standard header for using pthread...