.NET Framework Class Library
Barrier Class

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Enables multiple tasks to cooperatively work on an algorithm in parallel through multiple phases.

Namespace:  System.Threading
Assembly:  System (in System.dll)
Syntax
Visual Basic (Declaration) 
<ComVisibleAttribute(False)> _
<HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization := True,  _
    ExternalThreading := True)> _
Public Class Barrier _
    Implements IDisposable
Visual Basic (Usage) 
Dim instance As Barrier
C# 
[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true, 
    ExternalThreading = true)]
public class Barrier : IDisposable
Visual C++ 
[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction::LinkDemand, Synchronization = true, 
    ExternalThreading = true)]
public ref class Barrier : IDisposable
F# 
[<ComVisibleAttribute(false)>]
[<HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true, 
    ExternalThreading = true)>]
type Barrier =  
    class
        interface IDisposable
    end
Remarks
NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization | ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

A group of tasks cooperate by moving through a series of phases, where each in the group signals it has arrived at the Barrier in a given phase and implicitly waits for all others to arrive. The same Barrier can be used for multiple phases.

Inheritance Hierarchy
System..::.Object
  System.Threading..::.Barrier
Thread Safety

All public and protected members of Barrier are thread-safe and may be used concurrently from multiple threads, with the exception of Dispose, which must only be used when all other operations on the Barrier have completed.
Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4
See Also

Reference

Barrier Members
System.Threading Namespace

Other Resources

How to: Synchronize Concurrent Tasks with a Barrier
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