How to stop the thread execution in C++

Question

I created one thread in my main program, thread execution has to stop once the main program will terminate. I am using reader.join(); to terminate the thread ex

Answer 1

thread.join() does not cause the thread to terminate, it waits until the thread ends. It's the responsibility of the thread to end its execution, for example by periodically checking for a certain condition, like a flag.

You already have an atomic flag bReading, which appears to cause the thread to exit.

        if (queueInput.empty()) {
            mtxQueueInput.unlock();
            if (bReading.load())
                continue;
            else
                break;  // thread will exit when queue is empty and bReading == false

So all you need is to set bReading = false in the outer thread before calling thread.join().

bReading = false;
reader.join();

Note that bReading.store(false); inside your thread will have no effect.

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Note: you don't need to call atomic.load() and atomic.store(), you can just use them in your code, which will call load() and store() implicitly.