„Parallel Extensions“ – Versionsunterschied

'''Parallel Extensions''', previously known as the Parallel Framework Extensions or ('''PFX'''), is a [[Managed code|managed]] [[Concurrent programming|concurrency]] [[Library (computing)|library]] being developed by a collaboration between [[Microsoft Research]] and the [[Common Language Runtime|CLR]] team at [[Microsoft]]. It is composed of two parts: '[[#Parallel LINQ|''Parallel LINQ''']] ('''PLINQ''') and '[[#Task Parallel Library|''Task Parallel Library''']] ('''TPL''').<ref name="channel9">{{cite web | url = http://channel9.msdn.com/Showpost.aspx?postid=347531 | title = Programming in the Age of Concurrency: Concurrent Programming with PFX | accessdate = 2007-10-16}}</ref><ref name="msdnmag">{{cite web | url = http://msdn.microsoft.com/msdnmag/issues/07/10/Futures/default.aspx | title = MSDN Magazine: Task Parallel Library | accessdate = 2007-10-16}}</ref> It also consists of a set of '''Coordinationcoordination Datadata Structures'structures'' (CDS) - a setsets of [[data structure]]s used to synchronize and co-ordinate the execution of concurrent tasks.<ref name="somajune"/> The library was released as a [[Community Technology Preview|CTP]] on [[November 29]], [[2007]]<ref>{{cite web | url = http://blogs.msdn.com/somasegar/archive/2007/11/29/parallel-extensions-to-the-net-fx-ctp.aspx | title = Parallel Extensions to the .NET FX CTP | accessdate = 2007-11-30}}</ref> and refreshed again in December 2007 and June 2008.<ref name="somajune"/> Microsoft has announced that the '''Parallel Extensions to .NET''' will release as part of the .NET 4.0 Framework release.<ref>{{cite web | url = http://blogs.msdn.com/pfxteam/archive/2008/10/10/8994927.aspx | title = Parallel Programming and the .NET Framework 4.0 | accessdate = 2009-01-25}}</ref>.

==PLINQParallel LINQ==

'''Parallel LINQ''' ('''PLINQ''') is a concurrent query execution engine for [[Language Integrated Query|LINQ]], parallelizing the execution of queries on objects (LINQ to Objects) and XML data (LINQ to XML). PLINQ is intended for exposing [[data parallelism]] by use of queries.<ref name="channel9"/> Any computation on objects that has been implemented as queries can be parallelized by PLINQ. However, the objects need to implement the <code>IParallelEnumerable</code> interface, which is defined by PLINQ itself. Internally it uses [[#Task Parallel Library|TPL]] for execution.<ref name="somajune">{{cite web | url = http://blogs.msdn.com/somasegar/archive/2008/06/02/june-2008-ctp-parallel-extensions-to-the-net-fx.aspx | title = June 2008 CTP - Parallel Extensions to the .NET FX | accessdate = 2008-08-06}}</ref><ref>{{cite web | url = http://blogs.msdn.com/pfxteam/archive/2008/06/05/8576194.aspx | title = More powerful aggregations in PLINQ | accessdate = 2008-08-06}}</ref>

The '''Task Parallel Library''' ('''TPL''') is the [[task parallelism]] component of the Parallel Extensions to .NET.<ref name="Concurrent Programming on Windows Appendix B"/> It exposes parallel constructs like parallel <code>For</code> and <code>ForEach</code> loops, using regular method calls and [[Delegate (.NET)|delegates]]. As such, the constructs can be used from any language supporting the [[.NET Framework]]. The job of spawning and terminating [[Thread (computing)|threads]], as well as scaling the number of threads according to the number of available processors, is done by the library itself.<ref name="msdnmag"/>