SynchronizationAttribute Class
Assembly: mscorlib (in mscorlib.dll)
'Declaration <SerializableAttribute> _ <ComVisibleAttribute(True)> _ <AttributeUsageAttribute(AttributeTargets.Class)> _ Public Class SynchronizationAttribute Inherits ContextAttribute Implements IContributeServerContextSink, IContributeClientContextSink 'Usage Dim instance As SynchronizationAttribute
/** @attribute SerializableAttribute() */ /** @attribute ComVisibleAttribute(true) */ /** @attribute AttributeUsageAttribute(AttributeTargets.Class) */ public class SynchronizationAttribute extends ContextAttribute implements IContributeServerContextSink, IContributeClientContextSink
SerializableAttribute ComVisibleAttribute(true) AttributeUsageAttribute(AttributeTargets.Class) public class SynchronizationAttribute extends ContextAttribute implements IContributeServerContextSink, IContributeClientContextSink
Not applicable.
When this attribute is applied to an object, only one thread can be executing in all contexts that share an instance of this property. This is done by contributing sinks that intercept and serialize incoming calls for the respective contexts. If the property is marked for reentry, then callouts are intercepted too. The callout interception allows other waiting threads to enter the synchronization domain for maximal throughput.
Note: |
|---|
| There are two classes named SynchronizationAttribute : one in the System.Runtime.Remoting.Contexts namespace, and the other in the System.EnterpriseServices namespace. The System.EnterpriseServices.SynchronizationAttribute class supports only synchronous calls, and can be used only with serviced components. (For more information on serviced components, see Serviced Component Overview.) The System.Runtime.Remoting.Contexts.SynchronizationAttribute supports both synchronous and asynchronous calls, and can be used only with context bound objects. (For more information on context bound objects, see the ContextBoundObject class.) |
Note: |
|---|
| This class makes a link demand and an inheritance demand at the class level. A SecurityException is thrown when either the immediate caller or the derived class does not have infrastructure permission. For details about security demands, see Link Demands and Inheritance Demands. |
The following code example demonstrates the use of the SynchronizationAttribute. For the complete example code, see the example for the AsyncResult class.
' Context-bound type with the Synchronization context attribute. <Synchronization()> Public Class SampleSyncronized Inherits ContextBoundObject ' A method that does some work, and returns the square of the given number. Public Function Square(i As Integer) As Integer Console.Write("The hash of the thread executing ") Console.WriteLine("SampleSyncronized.Square is: {0}", Thread.CurrentThread.GetHashCode()) Return i * i End Function 'Square End Class 'SampleSyncronized
// Context-bound type with the Synchronization context attribute.
/** @attribute Synchronization()
*/
public class SampleSyncronized extends ContextBoundObject
{
// A method that does some work, and returns the square of the given number.
public int Square(int i)
{
Console.Write("The hash of the thread executing ");
Console.WriteLine("SampleSyncronized.Square is: {0}",
(Int32)System.Threading.Thread.get_CurrentThread().GetHashCode());
return i * i;
} //Square
} //SampleSyncronized
- SecurityPermission for operating with infrastructure code. Demand value: SecurityAction.LinkDemand; Permission Value: SecurityPermissionFlag.Infrastructure
- SecurityPermission for operating with infrastructure code. Demand value: SecurityAction.InheritanceDemand; Permission Value: SecurityPermissionFlag.Infrastructure
System.Attribute
System.Runtime.Remoting.Contexts.ContextAttribute
System.Runtime.Remoting.Contexts.SynchronizationAttribute
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
Note: