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 {
38 public sealed class ExecutionContext : ISerializable {
40 private SecurityContext _sc;
42 private bool _suppressFlow;
43 private bool _capture;
45 internal ExecutionContext ()
49 internal ExecutionContext (ExecutionContext ec)
53 _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);
73 if (SecurityManager.SecurityEnabled)
74 capture.SecurityContext = SecurityContext.Capture ();
79 public ExecutionContext CreateCopy ()
82 throw new InvalidOperationException ();
84 return new ExecutionContext (this);
88 [ReflectionPermission (SecurityAction.Demand, MemberAccess = true)]
89 public void GetObjectData (SerializationInfo info, StreamingContext context)
92 throw new ArgumentNullException ("info");
93 throw new NotImplementedException ();
98 internal SecurityContext SecurityContext {
101 _sc = new SecurityContext ();
107 internal bool FlowSuppressed {
108 get { return _suppressFlow; }
109 set { _suppressFlow = value; }
112 // Note: Previous to version 2.0 only the CompressedStack and (sometimes!) the WindowsIdentity
113 // were propagated to new threads. This is why ExecutionContext is internal in before NET_2_0.
114 // It also means that all newer context classes should be here (i.e. inside the #if NET_2_0).
116 public static bool IsFlowSuppressed ()
118 return Thread.CurrentThread.ExecutionContext.FlowSuppressed;
121 public static void RestoreFlow ()
123 ExecutionContext ec = Thread.CurrentThread.ExecutionContext;
124 if (!ec.FlowSuppressed)
125 throw new InvalidOperationException ();
127 ec.FlowSuppressed = false;
131 [MonoTODO ("only the SecurityContext is considered")]
132 [SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
133 public static void Run (ExecutionContext executionContext, ContextCallback callback, object state)
135 if (executionContext == null) {
136 throw new InvalidOperationException (Locale.GetText (
137 "Null ExecutionContext"));
140 // FIXME: supporting more than one context (the SecurityContext)
141 // will requires a rewrite of this method
143 SecurityContext.Run (executionContext.SecurityContext, callback, state);
146 public static AsyncFlowControl SuppressFlow ()
148 Thread t = Thread.CurrentThread;
149 t.ExecutionContext.FlowSuppressed = true;
150 return new AsyncFlowControl (t, AsyncFlowControlType.Execution);