CAS

public class SpinLock
    {
        private volatile int locked;

        public void Aquire()
        {
            while (System.Threading.Interlocked.CompareExchange(ref locked, 1, 0) != 0) 
           {
               //‘浪费’CPU周期 重试
           }
        }

        public void Release()
        {
            locked = 0;
        }