I’m going to use a simple program to illustrate the basic use of pthreads, and highlight some of the issues that you may run into when you’re creating your own threaded programs (for C++11 threads, see this post).
I want my program to print a message from each thread I create, to the console, in a different colour.
I’m going to build the program up in three steps, and talk about the issues we encounter on the way. I’m not going to go deeply into the pthreads calls – if you want to read about them in detail, there is an excellent break down and set of tutorials here.
Threads program, version 1 – faulty
Right, so here’s my first version of the program: threads1.cpp. Build it with:
g++ threads1.cpp -lpthread
Take a look, and I’ll talk through what I’ve done below.