1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
//
// 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]
#if NET_2_0
public sealed class ExecutionContext : ISerializable {
#else
internal sealed class ExecutionContext : ISerializable {
#endif
#if !NET_2_1 || MONOTOUCH
private SecurityContext _sc;
#endif
private bool _suppressFlow;
private bool _capture;
internal ExecutionContext ()
{
}
internal ExecutionContext (ExecutionContext ec)
{
#if !NET_2_1 || MONOTOUCH
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 !NET_2_1 || MONOTOUCH
if (SecurityManager.SecurityEnabled)
capture.SecurityContext = SecurityContext.Capture ();
#endif
return capture;
}
public ExecutionContext CreateCopy ()
{
if (!_capture)
throw new InvalidOperationException ();
return new ExecutionContext (this);
}
[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 !NET_2_1 || MONOTOUCH
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 NET_2_0 && (!NET_2_1 || MONOTOUCH)
[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);
}
#endif
#if !NET_2_1 || MONOTOUCH
public static AsyncFlowControl SuppressFlow ()
{
Thread t = Thread.CurrentThread;
t.ExecutionContext.FlowSuppressed = true;
return new AsyncFlowControl (t, AsyncFlowControlType.Execution);
}
#endif
}
}
|
