(Windows)Can I get the program to be changed or be stopped while it is running?

Question

I am now writing a win32 program in C++. I want to show my running process on the window, just like time is flowing.

For example, this code

int a=0;
for(int i=0;i<10;i++)
{
  a++;//The change in "a" can be seen on the window.
  Sleep(1*1000);
}

But I've found that if I want to show this process, like clicking a button and a changing number appears on the screen, then the program needs to be running all the time. At this point, I don't have a way to do anything else, like clicking on another button.

So I realized I needed an operation that could interrupt the current process. But I went through a lot of information and found that only the fork() function of the Linux system can meet my needs. But I'm using Windows now, so what other ways can I achieve this? Sincerely look forward to your reply.

Answer 1

Create a thread and use atomic.

std::atomic_int a_t(0);

auto do_a = [](std::atomic_int* pA)
{
for (int i = 0;i < 10;i++)
{
    (*pA)++;
    std::this_thread::sleep_for(1s);
}
};

thread t(do_a, &a_t);
t.join();
cout << a_t.load(memory_order::memory_order_relaxed);

Anytime you need get the value of a_t , just call a_t.load(memory_order::memory_order_relaxed);

Hope this helps you

Answer 2

It depends what you mean exactly by

has been overally ascending or descending lately?

One straightforward way to do this would be to fit a linear regression model to the range that you are interested in. The slope of the regression line will then answer this question.