112 lines
2.7 KiB
C#
112 lines
2.7 KiB
C#
//
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// System.Threading.AsyncFlowControl.cs
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//
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// Author:
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.Runtime.InteropServices;
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using System.Security;
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namespace System.Threading {
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internal enum AsyncFlowControlType {
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None,
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Execution,
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Security
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}
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public struct AsyncFlowControl : IDisposable {
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private Thread _t;
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private AsyncFlowControlType _type;
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internal AsyncFlowControl (Thread t, AsyncFlowControlType type)
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{
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_t = t;
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_type = type;
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}
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public void Undo ()
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{
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if (_t == null) {
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throw new InvalidOperationException (Locale.GetText (
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"Can only be called once."));
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}
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switch (_type) {
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case AsyncFlowControlType.Execution:
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ExecutionContext.RestoreFlow ();
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break;
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case AsyncFlowControlType.Security:
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SecurityContext.RestoreFlow ();
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break;
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}
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_t = null;
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}
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public void Dispose ()
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{
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if (_t != null) {
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Undo ();
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_t = null;
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_type = AsyncFlowControlType.None;
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}
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}
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public override int GetHashCode ()
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{
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return(base.GetHashCode ());
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}
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public override bool Equals (object obj)
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{
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if (!(obj is AsyncFlowControl)) {
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return(false);
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}
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return(obj.Equals (this));
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}
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public bool Equals (AsyncFlowControl obj)
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{
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if (this._t == obj._t &&
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this._type == obj._type) {
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return(true);
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} else {
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return(false);
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}
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}
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public static bool operator == (AsyncFlowControl a, AsyncFlowControl b)
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{
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return a.Equals (b);
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}
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public static bool operator != (AsyncFlowControl a, AsyncFlowControl b)
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{
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return !a.Equals (b);
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}
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}
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}
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