System.Threading.ServerSpinLock.Enter C# (CSharp) Method

        public void Enter(ref bool lockTaken)
        {
            if (lockTaken)
                throw new ArgumentException ("lockTaken", "lockTaken must be initialized to false");
            if (isThreadOwnerTrackingEnabled && IsHeldByCurrentThread)
                throw new LockRecursionException ();

            int slot = -1;

            RuntimeHelpers.PrepareConstrainedRegions ();
            try {
                slot = Interlocked.Increment (ref ticket.Users) - 1;

                ServerSpinWait wait = new ServerSpinWait ();
                while (slot != ticket.Value) {
                    wait.SpinOnce ();

                    while (stallTickets != null && stallTickets.TryRemove (ticket.Value))
                        ++ticket.Value;
                }
            } finally {
                if (slot == ticket.Value) {
                    lockTaken = true;
                    threadWhoTookLock = Thread.CurrentThread.ManagedThreadId;
                } else if (slot != -1) {
                    // We have been interrupted, initialize stallTickets
                    if (stallTickets == null)
                        Interlocked.CompareExchange (ref stallTickets, new ServerConcurrentOrderedList<int> (), null);
                    stallTickets.TryAdd (slot);
                }
            }
        }