-pp//
-// System.Runtime.Remoting.Contexts.SynchronizationAttribute..cs
+//
+// System.Runtime.Remoting.Contexts.SynchronizationAttribute.cs
//
// Author:
-// Miguel de Icaza (miguel@ximian.com)
+// Lluis Sanchez Gual (lluis@ximian.com)
//
-// (C) Ximian, Inc. http://www.ximian.com
+// (C) Novell, Inc. http://www.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.Threading;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Activation;
-namespace System.Runtime.Remoting.Contexts {
-
+namespace System.Runtime.Remoting.Contexts
+{
+ [AttributeUsage(AttributeTargets.Class)]
[Serializable]
- [AttributeUsage (AttributeTargets.Class)]
- public class SynchronizationAttribute : ContextAttribute
+ [System.Runtime.InteropServices.ComVisible (true)]
+ public class SynchronizationAttribute: ContextAttribute, IContributeClientContextSink, IContributeServerContextSink
{
public const int NOT_SUPPORTED = 1;
public const int SUPPORTED = 2;
public const int REQUIRED = 4;
public const int REQUIRES_NEW = 8;
+
+ bool _bReEntrant;
+ int _flavor;
- private bool _fReentrant = false;
- private int _nBehavior = REQUIRED;
- private bool _fLocked = false;
-
+ [NonSerialized]
+ bool _locked;
+ [NonSerialized]
+ int _lockCount;
+
+ [NonSerialized]
+ Mutex _mutex = new Mutex (false);
+ [NonSerialized]
+ Thread _ownerThread;
+
public SynchronizationAttribute ()
+ : this (REQUIRES_NEW, false)
{
}
-
- public SynchronizationAttribute (bool fReentrant)
+
+ public SynchronizationAttribute (bool reEntrant)
+ : this (REQUIRES_NEW, reEntrant)
{
- _fReentrant = fReentrant;
}
-
- public SynchronizationAttribute (int nBehavior)
+
+ public SynchronizationAttribute (int flag)
+ : this (flag, false)
+ {
+ }
+
+ public SynchronizationAttribute (int flag, bool reEntrant)
+ : base ("Synchronization")
{
- if (nBehavior != NOT_SUPPORTED &&
- nBehavior != SUPPORTED &&
- nBehavior != REQUIRED &&
- nBehavior != REQUIRES_NEW)
+ if (flag != NOT_SUPPORTED && flag != REQUIRED && flag != REQUIRES_NEW && flag != SUPPORTED)
+ throw new ArgumentException ("flag");
+
+ _bReEntrant = reEntrant;
+ _flavor = flag;
+ }
+
+ public virtual bool IsReEntrant
+ {
+ get { return _bReEntrant; }
+ }
+
+ public virtual bool Locked
+ {
+ get
+ {
+ return _locked;
+ }
+
+ set
{
- throw new ArgumentException ("Invalid Flag");
+ if (value)
+ {
+ _mutex.WaitOne ();
+ lock (this)
+ {
+ _lockCount++;
+ if (_lockCount > 1)
+ ReleaseLock (); // Thread already had the lock
+
+ _ownerThread = Thread.CurrentThread;
+ }
+ }
+ else
+ {
+ lock (this)
+ {
+ while (_lockCount > 0 && _ownerThread == Thread.CurrentThread)
+ {
+ _lockCount--;
+ _mutex.ReleaseMutex ();
+ _ownerThread = null;
+ }
+ }
+ }
}
- _nBehavior = nBehavior;
}
-
- public SynchronizationAttribute (int nBehavior, bool fReentrant)
+
+ internal void AcquireLock ()
{
- if (nBehavior != NOT_SUPPORTED &&
- nBehavior != SUPPORTED &&
- nBehavior != REQUIRED &&
- nBehavior != REQUIRES_NEW)
+ _mutex.WaitOne ();
+
+ lock (this)
{
- throw new ArgumentException ("Invalid Flag");
+ _ownerThread = Thread.CurrentThread;
+ _lockCount++;
}
- _nBehavior = nBehavior;
- _fReentrant = fReentrant;
}
- public virtual bool IsReEntrant
+ internal void ReleaseLock ()
{
- get { return _fReentrant; }
+ lock (this)
+ {
+ if (_lockCount > 0 && _ownerThread == Thread.CurrentThread) {
+ _lockCount--;
+ _mutex.ReleaseMutex ();
+ _ownerThread = null;
+ }
+ }
}
- public virtual bool Locked
+ [System.Runtime.InteropServices.ComVisible (true)]
+ public override void GetPropertiesForNewContext (IConstructionCallMessage ctorMsg)
{
- get { return _fLocked; }
- set { _fLocked = value; }
+ if (_flavor != NOT_SUPPORTED) {
+ ctorMsg.ContextProperties.Add (this);
+ }
}
-
- [MonoTODO]
+
public virtual IMessageSink GetClientContextSink (IMessageSink nextSink)
{
- throw new NotImplementedException ();
+ return new SynchronizedClientContextSink (nextSink, this);
+ }
+
+ public virtual IMessageSink GetServerContextSink (IMessageSink nextSink)
+ {
+ return new SynchronizedServerContextSink (nextSink, this);
+ }
+
+ [System.Runtime.InteropServices.ComVisible (true)]
+ public override bool IsContextOK (Context ctx, IConstructionCallMessage msg)
+ {
+ SynchronizationAttribute prop = ctx.GetProperty ("Synchronization") as SynchronizationAttribute;
+ switch (_flavor)
+ {
+ case NOT_SUPPORTED: return (prop == null);
+ case REQUIRED: return (prop != null);
+ case REQUIRES_NEW: return false;
+ case SUPPORTED: return true;
+ }
+ return false;
+ }
+
+ internal static void ExitContext ()
+ {
+ if (Thread.CurrentContext.IsDefaultContext) return;
+ SynchronizationAttribute prop = Thread.CurrentContext.GetProperty ("Synchronization") as SynchronizationAttribute;
+ if (prop == null) return;
+ prop.Locked = false;
+ }
+
+ internal static void EnterContext ()
+ {
+ if (Thread.CurrentContext.IsDefaultContext) return;
+ SynchronizationAttribute prop = Thread.CurrentContext.GetProperty ("Synchronization") as SynchronizationAttribute;
+ if (prop == null) return;
+ prop.Locked = true;
+ }
+ }
+
+ internal class SynchronizedClientContextSink: IMessageSink
+ {
+ IMessageSink _next;
+ SynchronizationAttribute _att;
+
+ public SynchronizedClientContextSink (IMessageSink next, SynchronizationAttribute att)
+ {
+ _att = att;
+ _next = next;
+ }
+
+ public IMessageSink NextSink
+ {
+ get { return _next; }
+ }
+
+ public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
+ {
+ if (_att.IsReEntrant)
+ {
+ _att.ReleaseLock(); // Unlock when leaving the context
+ replySink = new SynchronizedContextReplySink (replySink, _att, true);
+ }
+ return _next.AsyncProcessMessage (msg, replySink);
}
- [MonoTODO]
- public override void GetPropertiesForNewContext (IConstructionCallMessage ctorMsg)
+ public IMessage SyncProcessMessage (IMessage msg)
+ {
+ if (_att.IsReEntrant)
+ _att.ReleaseLock (); // Unlock when leaving the context
+
+ try
+ {
+ return _next.SyncProcessMessage (msg);
+ }
+ finally
+ {
+ if (_att.IsReEntrant)
+ _att.AcquireLock ();
+ }
+ }
+ }
+
+ internal class SynchronizedServerContextSink: IMessageSink
+ {
+ IMessageSink _next;
+ SynchronizationAttribute _att;
+
+ public SynchronizedServerContextSink (IMessageSink next, SynchronizationAttribute att)
+ {
+ _att = att;
+ _next = next;
+ }
+
+ public IMessageSink NextSink
{
- throw new NotImplementedException ();
+ get { return _next; }
+ }
+
+ public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
+ {
+ _att.AcquireLock ();
+ replySink = new SynchronizedContextReplySink (replySink, _att, false);
+ return _next.AsyncProcessMessage (msg, replySink);
}
- [MonoTODO]
- public virtual IMessageSink GetServerContextSink (IMessageSink nextSink)
+ public IMessage SyncProcessMessage (IMessage msg)
{
- throw new NotImplementedException ();
+ _att.AcquireLock ();
+ try
+ {
+ return _next.SyncProcessMessage (msg);
+ }
+ finally
+ {
+ _att.ReleaseLock ();
+ }
+ }
+ }
+
+ internal class SynchronizedContextReplySink: IMessageSink
+ {
+ IMessageSink _next;
+ bool _newLock;
+ SynchronizationAttribute _att;
+
+ public SynchronizedContextReplySink (IMessageSink next, SynchronizationAttribute att, bool newLock)
+ {
+ _newLock = newLock;
+ _next = next;
+ _att = att;
+ }
+
+ public IMessageSink NextSink
+ {
+ get { return _next; }
+ }
+
+ public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
+ {
+ // Never called
+ throw new NotSupportedException ();
}
- [MonoTODO]
- public override bool IsContextOK (Context ctx, IConstructionCallMessage msg)
+ public IMessage SyncProcessMessage (IMessage msg)
{
- throw new NotImplementedException ();
+ if (_newLock) _att.AcquireLock ();
+ else _att.ReleaseLock ();
+
+ try
+ {
+ return _next.SyncProcessMessage (msg);
+ }
+ finally
+ {
+ if (_newLock)
+ _att.ReleaseLock ();
+ }
}
}
}
+
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