ADDITIONAL SYSTEM INFORMATION :
Windows 11, x64

A DESCRIPTION OF THE PROBLEM :
When you write your custom spinlock, it doesn’t work with ++i, but it works with i+1


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
write code

ACTUAL -
0 and deadlock

---------- BEGIN SOURCE ----------

import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    private static AtomicInteger atomicInteger = new AtomicInteger(0);

    public static void main(String[] args) throws InterruptedException {

        for (int i = 0; i < 100; ++i) {
            var t1 = new Thread(() -> {
                for(;;) {
                    int saved = atomicInteger.get();

                    int newValue = ++saved;

                    if(atomicInteger.compareAndSet(saved, newValue)) {
                        return;
                    }
                }
            });

            var t2 = new Thread(() -> {
                for(;;) {
                    int saved = atomicInteger.get();

                    int newValue = ++saved;

                    if(atomicInteger.compareAndSet(saved, newValue)) {
                        return;
                    }
                }
            });

            t1.start();
            t2.start();
        }

        Thread.sleep(1000);

        System.out.println(atomicInteger.get());
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :

import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    private static AtomicInteger atomicInteger = new AtomicInteger(0);

    public static void main(String[] args) throws InterruptedException {

        for (int i = 0; i < 100; ++i) {
            var t1 = new Thread(() -> {
                for(;;) {
                    int saved = atomicInteger.get();

                    int newValue = saved + 1;

                    if(atomicInteger.compareAndSet(saved, newValue)) {
                        return;
                    }
                }
            });

            var t2 = new Thread(() -> {
                for(;;) {
                    int saved = atomicInteger.get();

                    int newValue = saved + 1;

                    if(atomicInteger.compareAndSet(saved, newValue)) {
                        return;
                    }
                }
            });

            t1.start();
            t2.start();
        }

        Thread.sleep(1000);

        System.out.println(atomicInteger.get());
    }
}

FREQUENCY : always