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//
// System.Threading.AsyncFlowControl structure
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Globalization;
using System.Runtime.InteropServices;
using System.Security;
namespace System.Threading {
internal enum AsyncFlowControlType {
None,
Execution,
Security
}
#if NET_2_0
public struct AsyncFlowControl : IDisposable {
#else
internal struct AsyncFlowControl : IDisposable {
#endif
private Thread _t;
private AsyncFlowControlType _type;
internal AsyncFlowControl (Thread t, AsyncFlowControlType type)
{
_t = t;
_type = type;
}
public void Undo ()
{
if (_t == null) {
throw new InvalidOperationException (Locale.GetText (
"Can only be called once."));
}
switch (_type) {
case AsyncFlowControlType.Execution:
ExecutionContext.RestoreFlow ();
break;
case AsyncFlowControlType.Security:
SecurityContext.RestoreFlow ();
break;
}
_t = null;
}
void IDisposable.Dispose ()
{
if (_t != null) {
Undo ();
_t = null;
_type = AsyncFlowControlType.None;
}
}
}
}
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