System.Threading.ThreadPoolBoundHandleOverlapped.CompletionCallback C# (CSharp) Method

        private static unsafe void CompletionCallback(uint errorCode, uint numBytes, NativeOverlapped* nativeOverlapped)
        {
            ThreadPoolBoundHandleOverlapped overlapped = (ThreadPoolBoundHandleOverlapped)Overlapped.Unpack(nativeOverlapped);

            //
            // The Win32 thread pool implementation of ThreadPoolBoundHandle does not permit reuse of NativeOverlapped
            // pointers without freeing them and allocating new a new one.  We need to ensure that code using the CLR
            // ThreadPool implementation follows those rules.
            //
            if (overlapped._completed)
                throw new InvalidOperationException(SR.InvalidOperation_NativeOverlappedReused);

            overlapped._completed = true;

            if (overlapped._boundHandle == null)
                throw new InvalidOperationException(SR.Argument_NativeOverlappedAlreadyFree);

            overlapped._userCallback(errorCode, numBytes, nativeOverlapped);
        }