2 // System.Threading.ExecutionContext.cs
5 // Lluis Sanchez (lluis@novell.com)
6 // Sebastien Pouliot <sebastien@ximian.com>
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Runtime.InteropServices;
31 using System.Runtime.Serialization;
32 using System.Security;
33 using System.Security.Permissions;
35 namespace System.Threading {
39 public sealed class ExecutionContext : ISerializable {
41 internal sealed class ExecutionContext : ISerializable {
43 private SecurityContext _sc;
44 private bool _suppressFlow;
45 private bool _capture;
47 internal ExecutionContext ()
51 internal ExecutionContext (ExecutionContext ec)
54 _sc = new SecurityContext (ec._sc);
55 _suppressFlow = ec._suppressFlow;
60 internal ExecutionContext (SerializationInfo info, StreamingContext context)
62 throw new NotImplementedException ();
65 public static ExecutionContext Capture ()
67 ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
68 if (ec.FlowSuppressed)
71 ExecutionContext capture = new ExecutionContext (ec);
72 if (SecurityManager.SecurityEnabled)
73 capture.SecurityContext = SecurityContext.Capture ();
77 public ExecutionContext CreateCopy ()
80 throw new InvalidOperationException ();
82 return new ExecutionContext (this);
86 [ReflectionPermission (SecurityAction.Demand, MemberAccess = true)]
87 public void GetObjectData (SerializationInfo info, StreamingContext context)
90 throw new ArgumentNullException ("info");
91 throw new NotImplementedException ();
96 internal SecurityContext SecurityContext {
99 _sc = new SecurityContext ();
105 internal bool FlowSuppressed {
106 get { return _suppressFlow; }
107 set { _suppressFlow = value; }
110 // Note: Previous to version 2.0 only the CompressedStack and (sometimes!) the WindowsIdentity
111 // were propagated to new threads. This is why ExecutionContext is internal in before NET_2_0.
112 // It also means that all newer context classes should be here (i.e. inside the #if NET_2_0).
114 public static bool IsFlowSuppressed ()
116 return Thread.CurrentThread.ExecutionContext.FlowSuppressed;
119 public static void RestoreFlow ()
121 ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
122 if (!ec.FlowSuppressed)
123 throw new InvalidOperationException ();
125 ec.FlowSuppressed = false;
128 [MonoTODO ("only the SecurityContext is considered")]
129 [SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
130 public static void Run (ExecutionContext executionContext, ContextCallback callBack, object state)
132 if (executionContext == null) {
133 throw new InvalidOperationException (Locale.GetText (
134 "Null ExecutionContext"));
137 // FIXME: supporting more than one context (the SecurityContext)
138 // will requires a rewrite of this method
140 SecurityContext.Run (executionContext.SecurityContext, callBack, state);
143 public static AsyncFlowControl SuppressFlow ()
145 Thread t = Thread.CurrentThread;
146 t.ExecutionContext.FlowSuppressed = true;
147 return new AsyncFlowControl (t, AsyncFlowControlType.Execution);