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StackExchange.Redis
Commit 343d1345 authored by Nick Craver's avatar Nick Craver
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Cleanup: SocketManager

parent 70c9882f
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Showing with 49 additions and 43 deletions
StackExchange.Redis/StackExchange/Redis/SocketManager.NoPoll.cs
View file @ 343d1345
#if !FEATURE_SOCKET_MODE_POLL
namespace StackExchange.Redis
{
partial class SocketManager
public partial class SocketManager
{
internal const SocketMode DefaultSocketMode = SocketMode.Async;
......@@ -12,5 +11,4 @@ private void OnAddRead(System.Net.Sockets.Socket socket, ISocketCallback callbac
}
}
}
#endif
\ No newline at end of file
StackExchange.Redis/StackExchange/Redis/SocketManager.Poll.cs
View file @ 343d1345
......@@ -8,14 +8,13 @@
namespace StackExchange.Redis
{
partial class SocketManager
public partial class SocketManager
{
internal const SocketMode DefaultSocketMode = SocketMode.Poll;
static readonly IntPtr[] EmptyPointers = new IntPtr[0];
static readonly WaitCallback HelpProcessItems = state =>
private static readonly IntPtr[] EmptyPointers = new IntPtr[0];
private static readonly WaitCallback HelpProcessItems = state =>
{
var qdsl = state as QueueDrainSyncLock;
if (qdsl != null && qdsl.Consume())
if (state is QueueDrainSyncLock qdsl && qdsl.Consume())
{
var mgr = qdsl.Manager;
mgr.ProcessItems(false);
......@@ -23,9 +22,9 @@ partial class SocketManager
}
};
private static ParameterizedThreadStart read = state => ((SocketManager)state).Read();
private static readonly ParameterizedThreadStart read = state => ((SocketManager)state).Read();
readonly Queue<ISocketCallback> readQueue = new Queue<ISocketCallback>(), errorQueue = new Queue<ISocketCallback>();
private readonly Queue<ISocketCallback> readQueue = new Queue<ISocketCallback>(), errorQueue = new Queue<ISocketCallback>();
private readonly Dictionary<IntPtr, SocketPair> socketLookup = new Dictionary<IntPtr, SocketPair>();
......@@ -36,7 +35,6 @@ partial class SocketManager
internal static extern int select([In] int ignoredParameter, [In, Out] IntPtr[] readfds, [In, Out] IntPtr[] writefds, [In, Out] IntPtr[] exceptfds, [In] ref TimeValue timeout);
private static void ProcessItems(Queue<ISocketCallback> queue, CallbackOperation operation)
{
if (queue == null) return;
while (true)
......@@ -73,7 +71,7 @@ private void OnAddRead(Socket socket, ISocketCallback callback)
lock (socketLookup)
{
if (isDisposed) throw new ObjectDisposedException(name);
if (isDisposed) throw new ObjectDisposedException(Name);
var handle = socket.Handle;
if (handle == IntPtr.Zero) throw new ObjectDisposedException("socket");
......@@ -112,6 +110,7 @@ private void ProcessItems(bool setState)
if (setState) managerState = ManagerState.ProcessErrorQueue;
ProcessItems(errorQueue, CallbackOperation.Error);
}
private void Read()
{
bool weAreReader = false;
......@@ -149,18 +148,19 @@ internal string LastErrorTimeRelative()
if (tmp == 0) return "never";
return unchecked(Environment.TickCount - tmp) + "ms ago";
}
private ISocketCallback GetCallback(IntPtr key)
{
lock(socketLookup)
{
SocketPair pair;
return socketLookup.TryGetValue(key, out pair) ? pair.Callback : null;
return socketLookup.TryGetValue(key, out SocketPair pair) ? pair.Callback : null;
}
}
private void ReadImpl()
{
List<IntPtr> dead = null, active = new List<IntPtr>();
List<ISocketCallback> activeCallbacks = new List<ISocketCallback>();
var activeCallbacks = new List<ISocketCallback>();
IntPtr[] readSockets = EmptyPointers, errorSockets = EmptyPointers;
long lastHeartbeat = Environment.TickCount;
SocketPair[] allSocketPairs = null;
......@@ -208,6 +208,7 @@ private void ReadImpl()
{
var socket = pair.Value.Socket;
if (socket.Handle == pair.Key && socket.Connected)
{
if (pair.Value.Socket.Connected)
{
active.Add(pair.Key);
......@@ -218,6 +219,7 @@ private void ReadImpl()
(dead ?? (dead = new List<IntPtr>())).Add(pair.Key);
}
}
}
if (dead != null && dead.Count != 0)
{
managerState = ManagerState.CullDeadSockets;
......@@ -341,7 +343,6 @@ private void ReadImpl()
}
}
if (ready >= 5) // number of sockets we should attempt to process by ourself before asking for help
{
// seek help, work in parallel, then synchronize
......@@ -374,11 +375,12 @@ private void StartReader()
var thread = new Thread(read, 32*1024) // don't need a huge stack
{
Priority = useHighPrioritySocketThreads ? ThreadPriority.AboveNormal : ThreadPriority.Normal,
Name = name + ":Read",
Name = Name + ":Read",
IsBackground = true
};
thread.Start(this);
}
[StructLayout(LayoutKind.Sequential)]
internal struct TimeValue
{
......@@ -391,7 +393,7 @@ public TimeValue(int microSeconds)
}
}
struct SocketPair
private struct SocketPair
{
public readonly ISocketCallback Callback;
public readonly Socket Socket;
......@@ -401,13 +403,15 @@ public SocketPair(Socket socket, ISocketCallback callback)
Callback = callback;
}
}
sealed class QueueDrainSyncLock
private sealed class QueueDrainSyncLock
{
private int workers;
public QueueDrainSyncLock(SocketManager manager)
{
Manager = manager;
}
public SocketManager Manager { get; }
internal bool Consume()
......
StackExchange.Redis/StackExchange/Redis/SocketManager.cs
View file @ 343d1345
......@@ -17,6 +17,7 @@ internal enum SocketMode
Poll,
Async
}
/// <summary>
/// Allows callbacks from SocketManager as work is discovered
/// </summary>
......@@ -25,7 +26,10 @@ internal partial interface ISocketCallback
/// <summary>
/// Indicates that a socket has connected
/// </summary>
/// <param name="stream">The network stream for this socket.</param>
/// <param name="log">A text logger to write to.</param>
SocketMode Connected(Stream stream, TextWriter log);
/// <summary>
/// Indicates that the socket has signalled an error condition
/// </summary>
......@@ -37,6 +41,7 @@ internal partial interface ISocketCallback
/// Indicates that data is available on the socket, and that the consumer should read synchronously from the socket while there is data
/// </summary>
void Read();
/// <summary>
/// Indicates that we cannot know whether data is available, and that the consume should commence reading asynchronously
/// </summary>
......@@ -55,6 +60,7 @@ public SocketToken(Socket socket)
{
Socket = socket;
}
public int Available => Socket?.Available ?? 0;
public bool HasValue => Socket != null;
......@@ -100,8 +106,8 @@ internal enum ManagerState
ProcessQueues,
ProcessReadQueue,
ProcessErrorQueue,
}
private static readonly ParameterizedThreadStart writeAllQueues = context =>
{
try { ((SocketManager)context).WriteAllQueues(); } catch { }
......@@ -109,37 +115,41 @@ internal enum ManagerState
private static readonly WaitCallback writeOneQueue = context =>
{
try { ((SocketManager)context).WriteOneQueue(); } catch { }
};
private readonly string name;
private readonly Queue<PhysicalBridge> writeQueue = new Queue<PhysicalBridge>();
private bool isDisposed;
private readonly bool useHighPrioritySocketThreads = true;
bool isDisposed;
private bool useHighPrioritySocketThreads = true;
/// <summary>
/// Gets the name of this SocketManager instance
/// </summary>
public string Name { get; }
/// <summary>
/// Creates a new (optionally named) SocketManager instance
/// Creates a new (optionally named) <see cref="SocketManager"/> instance
/// </summary>
/// <param name="name">The name for this <see cref="SocketManager"/>.</param>
public SocketManager(string name = null) : this(name, true) { }
/// <summary>
/// Creates a new SocketManager instance
/// Creates a new <see cref="SocketManager"/> instance
/// </summary>
/// <param name="name">The name for this <see cref="SocketManager"/>.</param>
/// <param name="useHighPrioritySocketThreads">Whether this <see cref="SocketManager"/> should use high priority sockets.</param>
public SocketManager(string name, bool useHighPrioritySocketThreads)
{
if (string.IsNullOrWhiteSpace(name)) name = GetType().Name;
this.name = name;
Name = name;
this.useHighPrioritySocketThreads = useHighPrioritySocketThreads;
// we need a dedicated writer, because when under heavy ambient load
// (a busy asp.net site, for example), workers are not reliable enough
#if NETSTANDARD1_5
Thread dedicatedWriter = new Thread(writeAllQueues);
var dedicatedWriter = new Thread(writeAllQueues);
#else
Thread dedicatedWriter = new Thread(writeAllQueues, 32 * 1024); // don't need a huge stack;
var dedicatedWriter = new Thread(writeAllQueues, 32 * 1024); // don't need a huge stack;
dedicatedWriter.Priority = useHighPrioritySocketThreads ? ThreadPriority.AboveNormal : ThreadPriority.Normal;
#endif
dedicatedWriter.Name = name + ":Write";
......@@ -153,11 +163,6 @@ private enum CallbackOperation
Error
}
/// <summary>
/// Gets the name of this SocketManager instance
/// </summary>
public string Name => name;
/// <summary>
/// Releases all resources associated with this instance
/// </summary>
......@@ -185,11 +190,9 @@ internal SocketToken BeginConnect(EndPoint endpoint, ISocketCallback callback, C
var formattedEndpoint = Format.ToString(endpoint);
var tuple = Tuple.Create(socket, callback);
if (endpoint is DnsEndPoint)
if (endpoint is DnsEndPoint dnsEndpoint)
{
// A work-around for a Mono bug in BeginConnect(EndPoint endpoint, AsyncCallback callback, object state)
DnsEndPoint dnsEndpoint = (DnsEndPoint)endpoint;
#if !FEATURE_THREADPOOL
multiplexer.LogLocked(log, "BeginConnect: {0}", formattedEndpoint);
socket.ConnectAsync(dnsEndpoint.Host, dnsEndpoint.Port).ContinueWith(t =>
......@@ -247,6 +250,7 @@ internal SocketToken BeginConnect(EndPoint endpoint, ISocketCallback callback, C
var token = new SocketToken(socket);
return token;
}
internal void SetFastLoopbackOption(Socket socket)
{
// SIO_LOOPBACK_FAST_PATH (https://msdn.microsoft.com/en-us/library/windows/desktop/jj841212%28v=vs.85%29.aspx)
......@@ -278,7 +282,7 @@ internal void SetFastLoopbackOption(Socket socket)
{
// Win8/Server2012+ only
var osVersion = Environment.OSVersion.Version;
if (osVersion.Major > 6 || osVersion.Major == 6 && osVersion.Minor >= 2)
if (osVersion.Major > 6 || (osVersion.Major == 6 && osVersion.Minor >= 2))
{
byte[] optionInValue = BitConverter.GetBytes(1);
socket.IOControl(SIO_LOOPBACK_FAST_PATH, optionInValue, null);
......
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