mcs/class/corlib/System.Threading/CompressedStack.cs

   1 //
   2 // System.Threading.Thread.cs
   3 //
   4 // Authors:
   5 //      Zoltan Varga (vargaz@freemail.hu)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  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:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  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.
  28 //
  29
  30 using System.Collections;
  31 using System.Diagnostics;
  32 using System.Reflection;
  33 using System.Runtime.InteropServices;
  34 using System.Runtime.Serialization;
  35 using System.Security;
  36 using System.Security.Permissions;
  37
  38 namespace System.Threading {
  39
  40 #if NET_2_0
  41         [Serializable]
  42         public sealed class CompressedStack : ISerializable {
  43 #else
  44         public class CompressedStack {
  45 #endif
  46                 private ArrayList _list;
  47
  48                 internal CompressedStack (int length)
  49                 {
  50                         if (length > 0)
  51                                 _list = new ArrayList (length);
  52                 }
  53
  54                 internal CompressedStack (CompressedStack cs)
  55                 {
  56                         if ((cs != null) && (cs._list != null))
  57                                 _list = (ArrayList) cs._list.Clone ();
  58                 }
  59
  60 #if NET_2_0
  61                 [ComVisibleAttribute (false)]
  62                 public
  63 #else
  64                 internal
  65 #endif
  66                 CompressedStack CreateCopy ()
  67                 {
  68                         return new CompressedStack (this);
  69                 }
  70
  71 #if NET_2_0
  72                 public
  73 #else
  74                 internal
  75 #endif
  76                 static CompressedStack Capture ()
  77                 {
  78                         CompressedStack cs = new CompressedStack (0);
  79                         cs._list = SecurityFrame.GetStack (1);
  80                         return cs;
  81                 }
  82
  83 #if NET_2_0
  84                 [MonoTODO ("incomplete")]
  85                 [ReflectionPermission (SecurityAction.Demand, MemberAccess = true)]
  86                 public void GetObjectData (SerializationInfo info, StreamingContext context)
  87                 {
  88                         if (info == null)
  89                                 throw new ArgumentNullException ("info");
  90                 }
  91
  92                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
  93                 [StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey="00000000000000000400000000000000")]
  94                 static public CompressedStack GetCompressedStack ()
  95                 {
  96                         // Note: CompressedStack.GetCompressedStack doesn't return null
  97                         // like Thread.CurrentThread.GetCompressedStack if no compressed
  98                         // stack is present.
  99                         return new CompressedStack (Thread.CurrentThread.GetCompressedStack ());
 100                 }
 101
 102                 [SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
 103                 static public void Run (CompressedStack compressedStack, ContextCallback callback, object state)
 104                 {
 105                         if (compressedStack == null)
 106                                 throw new ArgumentException ("compressedStack");
 107
 108                         Thread t = Thread.CurrentThread;
 109                         CompressedStack original = null;
 110                         try {
 111                                 original = t.GetCompressedStack ();
 112                                 t.SetCompressedStack (compressedStack);
 113                                 callback (state);
 114                         }
 115                         finally {
 116                                 if (original != null)
 117                                         t.SetCompressedStack (original);
 118                         }
 119                 }
 120 #endif
 121                 // internal stuff
 122
 123                 internal bool Equals (CompressedStack cs)
 124                 {
 125                         if (IsEmpty ())
 126                                 return cs.IsEmpty ();
 127                         if (cs.IsEmpty ())
 128                                 return false;
 129                         if (_list.Count != cs._list.Count)
 130                                 return false;
 131
 132                         for (int i=0; i < _list.Count; i++) {
 133                                 SecurityFrame sf1 = (SecurityFrame) _list [i];
 134                                 SecurityFrame sf2 = (SecurityFrame) cs._list [i];
 135                                 if (!sf1.Equals (sf2))
 136                                         return false;
 137                         }
 138                         return true;
 139                 }
 140
 141                 internal bool IsEmpty ()
 142                 {
 143                         return ((_list == null) || (_list.Count == 0));
 144                 }
 145
 146                 internal IList List {
 147                         get { return _list; }
 148                 }
 149         }
 150 }