Hands-On System Programming with Linux

Seeing the race

To demonstrate exactly this issue (actually seeing the data race), we will write another demo program. In this one, we will calculate the factorial of a given number (a quick reminder: 3! = 3 x 2 x 1 = 6; recall from your school days—the notation N! means factorial of N). Here's the relevant code:

For readability, only key parts of the source code are displayed; to view the complete source code, build, and run it. The entire tree is available for cloning from GitHub here: https://github.com/PacktPublishing/Hands-on-System-Programming-with-Linux.

Code: ch15/facto.c:

In main(), we initialize our mutex lock (and create two worker threads; we do not show the code to create the threads, destroy them, as well as the mutex):

printf( ...