OpenHardwareMonitor-retired: External/Aga.Controls/Threading/AbortableThreadPool.cs@5715aefd2bcc

     1 // Stephen Toub

     2 // stoub@microsoft.com

     4 using System;

     5 using System.Collections.Generic;

     6 using System.Text;

     7 using System.Threading;

     9 namespace Aga.Controls.Threading

    10 {

    11 	public class AbortableThreadPool

    12 	{

    13 		private LinkedList<WorkItem> _callbacks = new LinkedList<WorkItem>();

    14 		private Dictionary<WorkItem, Thread> _threads = new Dictionary<WorkItem, Thread>();

    16 		public WorkItem QueueUserWorkItem(WaitCallback callback)

    17 		{

    18 			return QueueUserWorkItem(callback, null);

    19 		}

    21 		public WorkItem QueueUserWorkItem(WaitCallback callback, object state)

    22 		{

    23 			if (callback == null) throw new ArgumentNullException("callback");

    25 			WorkItem item = new WorkItem(callback, state, ExecutionContext.Capture());

    26 			lock (_callbacks)

    27 			{

    28 				_callbacks.AddLast(item);

    29 			}

    30 			ThreadPool.QueueUserWorkItem(new WaitCallback(HandleItem));

    31 			return item;

    32 		}

    34 		private void HandleItem(object ignored)

    35 		{

    36 			WorkItem item = null;

    37 			try

    38 			{

    39 				lock (_callbacks)

    40 				{

    41 					if (_callbacks.Count > 0)

    42 					{

    43 						item = _callbacks.First.Value;

    44 						_callbacks.RemoveFirst();

    45 					}

    46 					if (item == null)

    47 						return;

    48 					_threads.Add(item, Thread.CurrentThread);

    50 				}

    51 				ExecutionContext.Run(item.Context,

    52 					delegate { item.Callback(item.State); }, null);

    53 			}

    54 			finally

    55 			{

    56 				lock (_callbacks)

    57 				{

    58 					if (item != null)

    59 						_threads.Remove(item);

    60 				}

    61 			}

    62 		}

    64 		public bool IsMyThread(Thread thread)

    65 		{

    66 			lock (_callbacks)

    67 			{

    68 				foreach (Thread t in _threads.Values)

    69 				{

    70 					if (t == thread)

    71 						return true;

    72 				}

    73 				return false;

    74 			}

    75 		}

    77 		public WorkItemStatus Cancel(WorkItem item, bool allowAbort)

    78 		{

    79 			if (item == null)

    80 				throw new ArgumentNullException("item");

    81 			lock (_callbacks)

    82 			{

    83 				LinkedListNode<WorkItem> node = _callbacks.Find(item);

    84 				if (node != null)

    85 				{

    86 					_callbacks.Remove(node);

    87 					return WorkItemStatus.Queued;

    88 				}

    89 				else if (_threads.ContainsKey(item))

    90 				{

    91 					if (allowAbort)

    92 					{

    93 						_threads[item].Abort();

    94 						_threads.Remove(item);

    95 						return WorkItemStatus.Aborted;

    96 					}

    97 					else

    98 						return WorkItemStatus.Executing;

    99 				}

   100 				else

   101 					return WorkItemStatus.Completed;

   102 			}

   103 		}

   105 		public void CancelAll(bool allowAbort)

   106 		{

   107 			lock (_callbacks)

   108 			{

   109 				_callbacks.Clear();

   110 				if (allowAbort)

   111 				{

   112 					foreach (Thread t in _threads.Values)

   113 						t.Abort();

   114 				}

   115 			}

   116 		}

   117 	}

   118 }

author	sl
	Thu, 01 Jan 2015 23:35:49 +0100
changeset 405	5715aefd2bcc
permissions	-rw-r--r--