AotInterlocked.cs

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using System;

namespace System.Threading
{
    public static class AotInterlocked
    {
        static SpinLock spinLock = new SpinLock(false);

        public static T Exchange<T>(ref T target, T newValue)
        {
            bool lockTaken = false;
            try
            {
                spinLock.Enter(ref lockTaken);
                
                T originalValue = target;
                
                target = newValue;
                
                return originalValue;
            }
            finally
            {
                if(lockTaken)
                    spinLock.Exit(false);
            }
        }

        public static T CompareExchange<T>(ref T target, T newValue, T comparand)
        {
            bool lockTaken = false;
            try
            {
                spinLock.Enter(ref lockTaken);
                
                T originalValue = target;
                
                if(Object.ReferenceEquals(target, comparand))
                    target = newValue;
                
                return originalValue;
            }
            finally
            {
                if(lockTaken)
                    spinLock.Exit(false);
            }
        }
    }
}