Working with threads

When the C++ program starts – that is, the main() function starts its execution – you can create and launch new threads that will run concurrently with the main thread. To start a thread in C++, you should declare a thread object and pass it the function that you want to run concurrently to the main thread. The following code demonstrates declaring and starting a thread using std::thread, which is defined as follows:

#include<thread>#include <iostream>
void foo()
{
    std::cout << "Testing a thread in C++" << std::endl;
}
int main()
{
    std::thread test_thread{foo};
}

That’s it. We can create a better example to show how two threads work concurrently. Let’s say we print numbers in a loop concurrently to see which thread prints what:

#include <thread>#include <iostream>
void print_numbers_in_background()
{
    auto ix...