//
// System.Threading.CompressedStackSwitcher structure
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004 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.ConstrainedExecution;
using System.Runtime.InteropServices;
namespace System.Threading{
[ComVisibleAttribute (false)]
public struct CompressedStackSwitcher : IDisposable {
private CompressedStack _cs;
private Thread _t;
internal CompressedStackSwitcher (CompressedStack cs, Thread t)
{
_cs = cs;
_t = t;
}
public override bool Equals (object obj)
{
if (obj == null)
return false;
if (obj is CompressedStackSwitcher)
return op_Equality (this, (CompressedStackSwitcher)obj);
return false;
}
public override int GetHashCode ()
{
// documented as always the same for all instances
return typeof (CompressedStackSwitcher).GetHashCode ();
// Microsoft seems to return 1404280835 every time
// (even between executions).
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
public void Undo ()
{
if ((_cs != null) && (_t != null)) {
lock (_cs) {
if ((_cs != null) && (_t != null)) {
_t.SetCompressedStack (_cs);
}
_t = null;
_cs = null;
}
}
}
public static bool op_Equality (CompressedStackSwitcher c1, CompressedStackSwitcher c2)
{
if (c1._cs == null)
return (c2._cs == null);
if (c2._cs == null)
return false;
if (c1._t.ManagedThreadId != c2._t.ManagedThreadId)
return false;
return c1._cs.Equals (c2._cs);
}
public static bool op_Inequality (CompressedStackSwitcher c1, CompressedStackSwitcher c2)
{
return !op_Equality (c1, c2);
}
void IDisposable.Dispose ()
{
Undo ();
}
}
}
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