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// Stephen Toub
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// stoub@microsoft.com
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Threading;
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namespace Aga.Controls.Threading
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{
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public class AbortableThreadPool
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{
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private LinkedList<WorkItem> _callbacks = new LinkedList<WorkItem>();
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private Dictionary<WorkItem, Thread> _threads = new Dictionary<WorkItem, Thread>();
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public WorkItem QueueUserWorkItem(WaitCallback callback)
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{
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return QueueUserWorkItem(callback, null);
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}
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public WorkItem QueueUserWorkItem(WaitCallback callback, object state)
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{
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if (callback == null) throw new ArgumentNullException("callback");
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WorkItem item = new WorkItem(callback, state, ExecutionContext.Capture());
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lock (_callbacks)
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{
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_callbacks.AddLast(item);
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}
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ThreadPool.QueueUserWorkItem(new WaitCallback(HandleItem));
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return item;
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}
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private void HandleItem(object ignored)
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{
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WorkItem item = null;
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try
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{
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lock (_callbacks)
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{
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if (_callbacks.Count > 0)
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{
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item = _callbacks.First.Value;
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_callbacks.RemoveFirst();
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}
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if (item == null)
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return;
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_threads.Add(item, Thread.CurrentThread);
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}
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ExecutionContext.Run(item.Context,
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delegate { item.Callback(item.State); }, null);
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}
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finally
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{
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lock (_callbacks)
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{
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if (item != null)
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_threads.Remove(item);
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}
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}
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}
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public bool IsMyThread(Thread thread)
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{
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lock (_callbacks)
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{
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foreach (Thread t in _threads.Values)
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{
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if (t == thread)
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return true;
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}
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return false;
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}
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}
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public WorkItemStatus Cancel(WorkItem item, bool allowAbort)
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{
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if (item == null)
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throw new ArgumentNullException("item");
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lock (_callbacks)
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{
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LinkedListNode<WorkItem> node = _callbacks.Find(item);
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if (node != null)
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{
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_callbacks.Remove(node);
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return WorkItemStatus.Queued;
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}
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else if (_threads.ContainsKey(item))
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{
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if (allowAbort)
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{
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_threads[item].Abort();
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_threads.Remove(item);
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return WorkItemStatus.Aborted;
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}
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else
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return WorkItemStatus.Executing;
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}
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else
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return WorkItemStatus.Completed;
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}
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}
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public void CancelAll(bool allowAbort)
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{
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lock (_callbacks)
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{
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_callbacks.Clear();
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if (allowAbort)
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{
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foreach (Thread t in _threads.Values)
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t.Abort();
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}
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}
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}
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}
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}
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