System.Net.Sockets.SocketPal.SelectViaPoll C# (CSharp) Метод

        private static unsafe SocketError SelectViaPoll(
            IList checkRead, int checkReadInitialCount,
            IList checkWrite, int checkWriteInitialCount,
            IList checkError, int checkErrorInitialCount,
            Interop.Sys.PollEvent* events, int eventsLength,
            int microseconds)
        {
            // Add each of the list's contents to the events array 
            Debug.Assert(eventsLength == checkReadInitialCount + checkWriteInitialCount + checkErrorInitialCount, "Invalid eventsLength");
            int offset = 0;
            AddToPollArray(events, eventsLength, checkRead, ref offset, Interop.Sys.PollEvents.POLLIN | Interop.Sys.PollEvents.POLLHUP);
            AddToPollArray(events, eventsLength, checkWrite, ref offset, Interop.Sys.PollEvents.POLLOUT);
            AddToPollArray(events, eventsLength, checkError, ref offset, Interop.Sys.PollEvents.POLLPRI);
            Debug.Assert(offset == eventsLength, $"Invalid adds. offset={offset}, eventsLength={eventsLength}.");

            // Do the poll
            uint triggered = 0;
            int milliseconds = microseconds == -1 ? -1 : microseconds / 1000;
            Interop.Error err = Interop.Sys.Poll(events, (uint)eventsLength, milliseconds, &triggered);
            if (err != Interop.Error.SUCCESS)
            {
                return GetSocketErrorForErrorCode(err);
            }

            // Remove from the lists any entries which weren't set
            if (triggered == 0)
            {
                checkRead?.Clear();
                checkWrite?.Clear();
                checkError?.Clear();
            }
            else
            {
                FilterPollList(checkRead, events, checkReadInitialCount - 1, Interop.Sys.PollEvents.POLLIN | Interop.Sys.PollEvents.POLLHUP);
                FilterPollList(checkWrite, events, checkWriteInitialCount + checkReadInitialCount - 1, Interop.Sys.PollEvents.POLLOUT);
                FilterPollList(checkError, events, checkErrorInitialCount + checkWriteInitialCount + checkReadInitialCount - 1, Interop.Sys.PollEvents.POLLERR | Interop.Sys.PollEvents.POLLPRI);
            }
            return SocketError.Success;
        }