C++ program that simulates a race condition on a shared resource (print to stdout).

RaceConditions.cpp

#include <iostream>
#include <thread>
#include <mutex>
using namespace std;

// mutex used to lock other threads from gaining access to shared resource
mutex m_mutex;

// shared print function for cout
void shared_print(char c, int v) {
        //m_mutex.lock(); // locks other threads from using resource, uncomment to see ipc sequence complications
        cout << c << v << "\n";
        //m_mutex.unlock(); // unlocks resource so that another thread can have access, uncomment to see ipc sequence complications
}

// function for sequence
void foo(char d, int a) {
        for (int i = 1; i <= a; i++) {
                shared_print(d, i);
        }
}

int main()
{
        thread th2(foo, 'A', 10); // child thread - 1
        thread th3(foo, 'B', 10); // child thread - 2
        thread th4(foo, 'C', 10); // child thread - 3

        th2.join(); // main thread, waits for child to finish
        th3.join(); // main thread, waits for child to finish
        th4.join(); // main thread, waits for child to finish
        return 0;
}