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

   1 //
   2 // System.Threading.SynchronizationContext.cs
   3 //
   4 // Author:
   5 //   Lluis Sanchez (lluis@novell.com)
   6 //
   7 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0
  30
  31 using System.Runtime.ConstrainedExecution;
  32 using System.Runtime.InteropServices;
  33
  34 namespace System.Threading
  35 {
  36         public class SynchronizationContext
  37         {
  38                 bool notification_required;
  39
  40                 [ThreadStatic]
  41                 static SynchronizationContext currentContext;
  42
  43                 public SynchronizationContext ()
  44                 {
  45                 }
  46
  47                 internal SynchronizationContext (SynchronizationContext context)
  48                 {
  49                         currentContext = context;
  50                 }
  51
  52                 public static SynchronizationContext Current
  53                 {
  54                         get {
  55 #if NET_2_1
  56                                 if (currentContext == null)
  57                                         currentContext = new SynchronizationContext ();
  58 #endif
  59                                 return currentContext;
  60                         }
  61                 }
  62
  63                 public virtual SynchronizationContext CreateCopy ()
  64                 {
  65                         return new SynchronizationContext (this);
  66                 }
  67
  68                 public bool IsWaitNotificationRequired ()
  69                 {
  70                         return notification_required;
  71                 }
  72
  73                 public virtual void OperationCompleted ()
  74                 {
  75                 }
  76
  77                 public virtual void OperationStarted ()
  78                 {
  79                 }
  80
  81                 public virtual void Post (SendOrPostCallback d, object state)
  82                 {
  83 #if NET_2_1
  84                         // WARNING: This is a horrible hack that short-circuites the SynchronizationContext
  85                         // logic for moonlight until we finish our Dispatcher implementation.  This is only
  86                         // put in place so that we can run moon-unit in the interim.
  87                         Console.WriteLine ("WARNING: SynchronizationContext short-circuited to UI thread hack.");
  88                         callback = (GSourceFunc) delegate (IntPtr ctx) { d(state); return false; };
  89                         g_idle_add (callback, IntPtr.Zero);
  90 #else
  91                         ThreadPool.QueueUserWorkItem (new WaitCallback (d), state);
  92 #endif
  93                 }
  94
  95                 public virtual void Send (SendOrPostCallback d, object state)
  96                 {
  97                         d (state);
  98                 }
  99
 100                 public static void SetSynchronizationContext (SynchronizationContext syncContext)
 101                 {
 102                         currentContext = syncContext;
 103                 }
 104
 105                 [MonoTODO]
 106                 protected void SetWaitNotificationRequired ()
 107                 {
 108                         notification_required = true;
 109                         throw new NotImplementedException ();
 110                 }
 111
 112                 [CLSCompliant (false)]
 113                 [PrePrepareMethod ()]
 114                 public virtual int Wait (IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout)
 115                 {
 116                         return WaitHelper (waitHandles, waitAll, millisecondsTimeout);
 117                 }
 118
 119                 [MonoTODO]
 120                 [CLSCompliant (false)]
 121                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 122                 [PrePrepareMethod ()]
 123                 protected static int WaitHelper (IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout)
 124                 {
 125                         throw new NotImplementedException ();
 126                 }
 127
 128 #if NET_2_1
 129                 GSourceFunc callback;
 130
 131                 public delegate bool GSourceFunc (IntPtr data);
 132
 133                 [DllImport ("moon")]
 134                 static extern uint g_idle_add (GSourceFunc callback, IntPtr data);
 135 #endif
 136         }
 137 }
 138
 139 #endif