GetGeneration() private method

private GetGeneration ( Object obj ) : int
obj Object
return int
        internal object Allocate()
        {
            // Fast path, get it from our Gen2 aged _freeList.
            object returnBuffer;

            if (!_freeList.TryPop(out returnBuffer))
            {
                Restock(out returnBuffer);
            }

            // Computing free count is expensive enough that we don't want to compute it unless logging is on.
            if (PinnableBufferCacheEventSource.Log.IsEnabled())
            {
                int numAllocCalls = Interlocked.Increment(ref _numAllocCalls);
                if (numAllocCalls >= 1024)
                {
                    lock (this)
                    {
                        int previousNumAllocCalls = Interlocked.Exchange(ref _numAllocCalls, 0);
                        if (previousNumAllocCalls >= 1024)
                        {
                            int nonGen2Count = 0;
                            foreach (object o in _freeList)
                            {
                                if (GC.GetGeneration(o) < GC.MaxGeneration)
                                {
                                    nonGen2Count++;
                                }
                            }

                            PinnableBufferCacheEventSource.Log.WalkFreeListResult(_cacheName, _freeList.Count, nonGen2Count);
                        }
                    }
                }

                PinnableBufferCacheEventSource.Log.AllocateBuffer(_cacheName, PinnableBufferCacheEventSource.AddressOf(returnBuffer), returnBuffer.GetHashCode(), GC.GetGeneration(returnBuffer), _freeList.Count);
            }
            return(returnBuffer);
        }