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//
// System.Threading.ExecutionContext.cs
//
// Authors:
// Lluis Sanchez (lluis@novell.com)
// 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.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security;
using System.Security.Permissions;
namespace System.Threading {
[Serializable]
public sealed class ExecutionContext : ISerializable
#if NET_4_0
, IDisposable
#endif
{
#if !MOONLIGHT
private SecurityContext _sc;
#endif
private bool _suppressFlow;
private bool _capture;
internal ExecutionContext ()
{
}
internal ExecutionContext (ExecutionContext ec)
{
#if !MOONLIGHT
if (ec._sc != null)
_sc = new SecurityContext (ec._sc);
#endif
_suppressFlow = ec._suppressFlow;
_capture = true;
}
[MonoTODO]
internal ExecutionContext (SerializationInfo info, StreamingContext context)
{
throw new NotImplementedException ();
}
public static ExecutionContext Capture ()
{
ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
if (ec.FlowSuppressed)
return null;
ExecutionContext capture = new ExecutionContext (ec);
#if !MOONLIGHT
if (SecurityManager.SecurityEnabled)
capture.SecurityContext = SecurityContext.Capture ();
#endif
return capture;
}
public ExecutionContext CreateCopy ()
{
if (!_capture)
throw new InvalidOperationException ();
return new ExecutionContext (this);
}
#if NET_4_0
public void Dispose ()
{
if (_sc != null)
_sc.Dispose ();
}
#endif
[MonoTODO]
[ReflectionPermission (SecurityAction.Demand, MemberAccess = true)]
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
throw new NotImplementedException ();
}
// internal stuff
#if !MOONLIGHT
internal SecurityContext SecurityContext {
get {
if (_sc == null)
_sc = new SecurityContext ();
return _sc;
}
set { _sc = value; }
}
#endif
internal bool FlowSuppressed {
get { return _suppressFlow; }
set { _suppressFlow = value; }
}
// Note: Previous to version 2.0 only the CompressedStack and (sometimes!) the WindowsIdentity
// were propagated to new threads. This is why ExecutionContext is internal in before NET_2_0.
// It also means that all newer context classes should be here (i.e. inside the #if NET_2_0).
public static bool IsFlowSuppressed ()
{
return Thread.CurrentThread.ExecutionContext.FlowSuppressed;
}
public static void RestoreFlow ()
{
ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
if (!ec.FlowSuppressed)
throw new InvalidOperationException ();
ec.FlowSuppressed = false;
}
#if !MOONLIGHT
[MonoTODO ("only the SecurityContext is considered")]
[SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
public static void Run (ExecutionContext executionContext, ContextCallback callback, object state)
{
if (executionContext == null) {
throw new InvalidOperationException (Locale.GetText (
"Null ExecutionContext"));
}
// FIXME: supporting more than one context (the SecurityContext)
// will requires a rewrite of this method
SecurityContext.Run (executionContext.SecurityContext, callback, state);
}
public static AsyncFlowControl SuppressFlow ()
{
Thread t = Thread.CurrentThread;
t.ExecutionContext.FlowSuppressed = true;
return new AsyncFlowControl (t, AsyncFlowControlType.Execution);
}
#endif
}
}
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