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//
// System.Threading.Thread.cs
//
// Authors:
// Zoltan Varga (vargaz@freemail.hu)
// 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.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security;
using System.Security.Permissions;
namespace System.Threading {
[Serializable]
public sealed class CompressedStack : ISerializable {
private ArrayList _list;
internal CompressedStack (int length)
{
if (length > 0)
_list = new ArrayList (length);
}
internal CompressedStack (CompressedStack cs)
{
if ((cs != null) && (cs._list != null))
_list = (ArrayList) cs._list.Clone ();
}
[ComVisibleAttribute (false)]
public CompressedStack CreateCopy ()
{
return new CompressedStack (this);
}
public static CompressedStack Capture ()
{
#if !FEATURE_COMPRESSEDSTACK
throw new NotSupportedException ();
#else
CompressedStack cs = new CompressedStack (0);
cs._list = new ArrayList ();
// include any current CompressedStack inside the new Capture
CompressedStack currentCs = Thread.CurrentThread.ExecutionContext.SecurityContext.CompressedStack;
if (currentCs != null) {
for (int i=0; i < currentCs._list.Count; i++)
cs._list.Add (currentCs._list [i]);
}
return cs;
#endif
}
// NOTE: This method doesn't show in the class library status page because
// it cannot be "found" with the StrongNameIdentityPermission for ECMA key.
// But it's there!
[SecurityCritical]
static public CompressedStack GetCompressedStack ()
{
#if !FEATURE_COMPRESSEDSTACK
throw new NotSupportedException ();
#else
// Note: CompressedStack.GetCompressedStack doesn't return null
// like Thread.CurrentThread.GetCompressedStack if no compressed
// stack is present.
CompressedStack cs = Thread.CurrentThread.ExecutionContext.SecurityContext.CompressedStack;
if (cs == null || cs.IsEmpty ()) {
cs = CompressedStack.Capture ();
} else {
cs = cs.CreateCopy ();
// merge the existing compressed stack (from a previous Thread) with the current
// Thread stack so we can assign "all of it" to yet another Thread
CompressedStack newstack = CompressedStack.Capture ();
for (int i=0; i < newstack._list.Count; i++)
cs._list.Add (newstack._list [i]);
}
return cs;
#endif
}
[MonoTODO ("incomplete")]
[SecurityCritical]
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
}
[SecurityCritical]
static public void Run (CompressedStack compressedStack, ContextCallback callback, object state)
{
#if !FEATURE_COMPRESSEDSTACK
throw new NotSupportedException ();
#else
if (compressedStack == null)
throw new ArgumentException ("compressedStack");
Thread t = Thread.CurrentThread;
CompressedStack original = null;
try {
original = t.ExecutionContext.SecurityContext.CompressedStack;
t.ExecutionContext.SecurityContext.CompressedStack = compressedStack;
callback (state);
}
finally {
if (original != null)
t.ExecutionContext.SecurityContext.CompressedStack = original;
}
#endif
}
// internal stuff
internal bool Equals (CompressedStack cs)
{
if (IsEmpty ())
return cs.IsEmpty ();
if (cs.IsEmpty ())
return false;
if (_list.Count != cs._list.Count)
return false;
return true;
}
internal bool IsEmpty ()
{
return ((_list == null) || (_list.Count == 0));
}
internal IList List {
get { return _list; }
}
}
}
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