SIGABRT in critical section simulation C++ code

Question

I am new to threads, I am trying to simulate the critical section race condition problem in this code.

#include <iostream>
#include <thread>
#include <chrono>
using namespace std;
using namespace std::chrono;

int x = 20;

void increment()
{
    ++x;
}

void decrement()
{
    --x;
}

int main()
{
    thread t1(increment);
    thread t2(decrement);
    cout << x;
    return 0;
}

But, this code terminates with SIGABRT.
terminate called without an active exception
21
Why I am getting SIGABRT in this code?

Answer 1

You must call join for the threads so that they are properly terminated

t1.join();
t2.join();