Beispiel #1
0
        /// <summary>
        /// </summary>
        /// <param name="items">  (must not be null)</param>
        /// <param name="itemsCount"></param>
        /// <param name="timeout">a time-out period, in milliseconds</param>
        /// <returns></returns>
        /// <exception cref="FaultException">The internal select operation failed.</exception>
        /// <exception cref="ArgumentNullException"><paramref name="items"/> is <c>null</c>.</exception>
        /// <exception cref="TerminatingException">The socket has been stopped.</exception>
        public bool Select(SelectItem[] items, int itemsCount, long timeout)
        {
            if (items == null)
            {
                throw new ArgumentNullException("items");
            }

            if (itemsCount == 0)
            {
                return(false);
            }

            bool firstPass      = true;
            int  numberOfEvents = 0;

            Stopwatch stopwatch = null;

            while (true)
            {
                long currentTimeoutMicroSeconds;

                if (firstPass)
                {
                    currentTimeoutMicroSeconds = 0;
                }
                else if (timeout < 0)
                {
                    // Consider everything below 0 to be infinite
                    currentTimeoutMicroSeconds = -1;
                }
                else
                {
                    currentTimeoutMicroSeconds = (timeout - stopwatch.ElapsedMilliseconds) * 1000;

                    if (currentTimeoutMicroSeconds < 0)
                    {
                        currentTimeoutMicroSeconds = 0;
                    }
                    else if (currentTimeoutMicroSeconds > int.MaxValue)
                    {
                        currentTimeoutMicroSeconds = int.MaxValue;
                    }
                }

                m_checkRead.Clear();
                m_checkWrite.Clear();
                m_checkError.Clear();

                for (int i = 0; i < itemsCount; i++)
                {
                    var pollItem = items[i];

                    if (pollItem.Socket != null)
                    {
                        if (pollItem.Event != PollEvents.None && pollItem.Socket.Handle.Connected)
                        {
                            m_checkRead.Add(pollItem.Socket.Handle);
                        }
                    }
                    else
                    {
                        if (pollItem.Event.HasIn())
                        {
                            m_checkRead.Add(pollItem.FileDescriptor);
                        }

                        if (pollItem.Event.HasOut())
                        {
                            m_checkWrite.Add(pollItem.FileDescriptor);
                        }
                    }
                }

                try
                {
                    SocketUtility.Select(m_checkRead, m_checkWrite, m_checkError, (int)currentTimeoutMicroSeconds);
                }
                catch (SocketException x)
                {
#if DEBUG
                    string textOfListRead  = StringLib.AsString(m_checkRead);
                    string textOfListWrite = StringLib.AsString(m_checkWrite);
                    string textOfListError = StringLib.AsString(m_checkError);
                    string xMsg            = string.Format("In Selector.Select, Socket.Select({0}, {1}, {2}, {3}) threw a SocketException: {4}", textOfListRead, textOfListWrite, textOfListError, currentTimeoutMicroSeconds, x.Message);
                    Debug.WriteLine(xMsg);
                    throw new FaultException(innerException: x, message: xMsg);
#else
                    throw new FaultException(innerException: x, message: "Within SocketUtility.Select");
#endif
                }

                for (int i = 0; i < itemsCount; i++)
                {
                    var selectItem = items[i];

                    selectItem.ResultEvent = PollEvents.None;

                    if (selectItem.Socket != null)
                    {
                        var events = (PollEvents)selectItem.Socket.GetSocketOption(ZmqSocketOption.Events);

                        if (selectItem.Event.HasIn() && events.HasIn())
                        {
                            selectItem.ResultEvent |= PollEvents.PollIn;
                        }

                        if (selectItem.Event.HasOut() && events.HasOut())
                        {
                            selectItem.ResultEvent |= PollEvents.PollOut;
                        }
                    }
                    else
                    {
                        if (m_checkRead.Contains(selectItem.FileDescriptor))
                        {
                            selectItem.ResultEvent |= PollEvents.PollIn;
                        }

                        if (m_checkWrite.Contains(selectItem.FileDescriptor))
                        {
                            selectItem.ResultEvent |= PollEvents.PollOut;
                        }
                    }

                    if (selectItem.ResultEvent != PollEvents.None)
                    {
                        numberOfEvents++;
                    }
                }

                if (timeout == 0)
                {
                    break;
                }

                if (numberOfEvents > 0)
                {
                    break;
                }

                if (timeout < 0)
                {
                    if (firstPass)
                    {
                        firstPass = false;
                    }

                    continue;
                }

                if (firstPass)
                {
                    stopwatch = Stopwatch.StartNew();
                    firstPass = false;
                    continue;
                }

                // Check also equality as it might frequently occur on 1000Hz clock
                if (stopwatch.ElapsedMilliseconds >= timeout)
                {
                    break;
                }
            }

            return(numberOfEvents > 0);
        }
Beispiel #2
0
        /// <summary>
        /// This method is the polling-loop that is invoked on a background thread when Start is called.
        /// As long as Stop hasn't been called: execute the timers, and invoke the handler-methods on each of the saved PollSets.
        /// </summary>
        private void Loop()
        {
            var readList = new List <Socket>();
//            var writeList = new List<Socket>();
            var errorList = new List <Socket>();

            while (!m_stopping)
            {
                // Transfer any sockets from the add-list.
                m_handles.AddRange(m_addList);
                m_addList.Clear();

                // Execute any due timers.
                int timeout = ExecuteTimers();

                readList.AddRange(m_checkRead.ToArray());
//                writeList.AddRange(m_checkWrite.ToArray());
                errorList.AddRange(m_checkError.ToArray());

                try
                {
                    SocketUtility.Select(readList, /*writeList*/ null, errorList, timeout != 0 ? timeout * 1000 : -1);
                }
                catch (SocketException)
                {
                    continue;
                }

                // For every PollSet in our list.
                foreach (var pollSet in m_handles)
                {
                    if (pollSet.Cancelled)
                    {
                        continue;
                    }

                    // Invoke its handler's InEvent if it's in our error-list.
                    if (errorList.Contains(pollSet.Socket))
                    {
                        try
                        {
                            pollSet.Handler.InEvent();
                        }
                        catch (TerminatingException)
                        {
                        }
                    }

                    if (pollSet.Cancelled)
                    {
                        continue;
                    }

//                    // Invoke its handler's OutEvent if it's in our write-list.
//                    if (writeList.Contains(pollSet.Socket))
//                    {
//                        try
//                        {
//                            pollSet.Handler.OutEvent();
//                        }
//                        catch (TerminatingException)
//                        {
//                        }
//                    }
//
//                    if (pollSet.Cancelled)
//                        continue;

                    // Invoke its handler's InEvent if it's in our read-list.
                    if (readList.Contains(pollSet.Socket))
                    {
                        try
                        {
                            pollSet.Handler.InEvent();
                        }
                        catch (TerminatingException)
                        {
                        }
                    }
                }

                errorList.Clear();
//                writeList.Clear();
                readList.Clear();

                if (m_retired)
                {
                    // Take any sockets that have been cancelled out of the list.
                    foreach (var item in m_handles.Where(k => k.Cancelled).ToList())
                    {
                        m_handles.Remove(item);
                    }

                    m_retired = false;
                }
            }
            m_stopped = true;
        }
Beispiel #3
0
        /// <summary>
        /// This method is the polling-loop that is invoked on a background thread when Start is called.
        /// As long as Stop hasn't been called: execute the timers, and invoke the handler-methods on each of the saved PollSets.
        /// </summary>
        private void Loop()
        {
            var readList = new List <Socket>();
//            var writeList = new List<Socket>();
            var errorList = new List <Socket>();

            while (!m_stopping)
            {
                // Transfer any sockets from the add-list.
                m_handles.AddRange(m_addList);
                m_addList.Clear();

                // Execute any due timers.
                int timeout = ExecuteTimers();

                readList.AddRange(m_checkRead.ToArray());
//                writeList.AddRange(m_checkWrite.ToArray());
                errorList.AddRange(m_checkError.ToArray());

                try
                {
                    timeout = timeout != 0 ? timeout * 1000 : -1;
#if NETFRAMEWORK
                    Socket.Select(readList, null, errorList, timeout);
#else
                    if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                    {
                        // Socket.Select does not work properly on macOS .NET Core when readList and errorList are passed
                        // together. To avoid this problem, we call the Select function separately for errorList.
                        // Please refer to this issue: https://github.com/dotnet/corefx/issues/39617
                        SocketUtility.Select(readList, null, null, timeout);
                        SocketUtility.Select(null, null, errorList, timeout);
                    }
                    else
                    {
                        Socket.Select(readList, null, errorList, timeout);
                    }
#endif
                }
                catch (SocketException)
                {
                    continue;
                }

                // For every PollSet in our list.
                foreach (var pollSet in m_handles)
                {
                    if (pollSet.Cancelled)
                    {
                        continue;
                    }

                    // Invoke its handler's InEvent if it's in our error-list.
                    if (errorList.Contains(pollSet.Socket))
                    {
                        try
                        {
                            pollSet.Handler.InEvent();
                        }
                        catch (TerminatingException)
                        {
                        }
                    }

                    if (pollSet.Cancelled)
                    {
                        continue;
                    }

//                    // Invoke its handler's OutEvent if it's in our write-list.
//                    if (writeList.Contains(pollSet.Socket))
//                    {
//                        try
//                        {
//                            pollSet.Handler.OutEvent();
//                        }
//                        catch (TerminatingException)
//                        {
//                        }
//                    }
//
//                    if (pollSet.Cancelled)
//                        continue;

                    // Invoke its handler's InEvent if it's in our read-list.
                    if (readList.Contains(pollSet.Socket))
                    {
                        try
                        {
                            pollSet.Handler.InEvent();
                        }
                        catch (TerminatingException)
                        {
                        }
                    }
                }

                errorList.Clear();
//                writeList.Clear();
                readList.Clear();

                if (m_retired)
                {
                    // Take any sockets that have been cancelled out of the list.
                    foreach (var item in m_handles.Where(k => k.Cancelled).ToList())
                    {
                        m_handles.Remove(item);
                    }

                    m_retired = false;
                }
            }
            m_stopped = true;
        }