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VisualPascalABCNET/FormsDesignerBinding/Dependecies/src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/BusyManager.cs
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14 май 2015, 22:35
14 май 2015, 22:35
e6e67c1
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt) // This code is distributed under the GNU LGPL (for details please see \doc\license.txt) using System; using System.Collections.Generic; namespace ICSharpCode.SharpDevelop.Dom { /// <summary> /// This class is used to prevent stack overflows by representing a 'busy' flag /// that prevents reentrance when another call is running. /// However, using a simple 'bool busy' is not thread-safe, so we use a /// thread-static BusyManager. /// </summary> sealed class BusyManager { public struct BusyLock : IDisposable { public static readonly BusyLock Failed = new BusyLock(null); readonly BusyManager manager; public BusyLock(BusyManager manager) { this.manager = manager; } public bool Success { get { return manager != null; } } public void Dispose() { if (manager != null) { manager.activeObjects.RemoveAt(manager.activeObjects.Count - 1); } } } readonly List<object> activeObjects = new List<object>(); public BusyLock Enter(object obj) { for (int i = 0; i < activeObjects.Count; i++) { if (activeObjects[i] == obj) return BusyLock.Failed; } activeObjects.Add(obj); return new BusyLock(this); } } }