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
  81                         // include any current CompressedStack inside the new Capture
  82                         CompressedStack currentCs = Thread.CurrentThread.GetCompressedStack ();
  83                         if (currentCs != null) {
  84                                 for (int i=0; i < currentCs._list.Count; i++)
  85                                         cs._list.Add (currentCs._list [i]);
  86                         }
  87                         return cs;
  88                 }
  89
  90                 // NOTE: This method doesn't show in the class library status page because
  91                 // it cannot be "found" with the StrongNameIdentityPermission for ECMA key.
  92                 // But it's there!
  93                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
  94                 [StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey="00000000000000000400000000000000")]
  95                 static public CompressedStack GetCompressedStack ()
  96                 {
  97                         // Note: CompressedStack.GetCompressedStack doesn't return null
  98                         // like Thread.CurrentThread.GetCompressedStack if no compressed
  99                         // stack is present.
 100                         CompressedStack cs = Thread.CurrentThread.GetCompressedStack ();
 101                         if (cs == null) {
 102                                 cs = CompressedStack.Capture ();
 103                         } else {
 104                                 // merge the existing compressed stack (from a previous Thread) with the current
 105                                 // Thread stack so we can assign "all of it" to yet another Thread
 106                                 CompressedStack newstack = CompressedStack.Capture ();
 107                                 for (int i=0; i < newstack._list.Count; i++)
 108                                         cs._list.Add (newstack._list [i]);
 109                         }
 110                         return cs;
 111                 }
 112
 113 #if NET_2_0
 114                 [MonoTODO ("incomplete")]
 115                 [ReflectionPermission (SecurityAction.Demand, MemberAccess = true)]
 116                 public void GetObjectData (SerializationInfo info, StreamingContext context)
 117                 {
 118                         if (info == null)
 119                                 throw new ArgumentNullException ("info");
 120                 }
 121
 122                 [SecurityPermission (SecurityAction.LinkDemand, Infrastructure = true)]
 123                 static public void Run (CompressedStack compressedStack, ContextCallback callback, object state)
 124                 {
 125                         if (compressedStack == null)
 126                                 throw new ArgumentException ("compressedStack");
 127
 128                         Thread t = Thread.CurrentThread;
 129                         CompressedStack original = null;
 130                         try {
 131                                 original = t.GetCompressedStack ();
 132                                 t.SetCompressedStack (compressedStack);
 133                                 callback (state);
 134                         }
 135                         finally {
 136                                 if (original != null)
 137                                         t.SetCompressedStack (original);
 138                         }
 139                 }
 140 #endif
 141                 // internal stuff
 142
 143                 internal bool Equals (CompressedStack cs)
 144                 {
 145                         if (IsEmpty ())
 146                                 return cs.IsEmpty ();
 147                         if (cs.IsEmpty ())
 148                                 return false;
 149                         if (_list.Count != cs._list.Count)
 150                                 return false;
 151
 152                         for (int i=0; i < _list.Count; i++) {
 153                                 SecurityFrame sf1 = (SecurityFrame) _list [i];
 154                                 SecurityFrame sf2 = (SecurityFrame) cs._list [i];
 155                                 if (!sf1.Equals (sf2))
 156                                         return false;
 157                         }
 158                         return true;
 159                 }
 160
 161                 internal bool IsEmpty ()
 162                 {
 163                         return ((_list == null) || (_list.Count == 0));
 164                 }
 165
 166                 internal IList List {
 167                         get { return _list; }
 168                 }
 169         }
 170 }