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.NET Parallel Programming
.NET Parallel Programming
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    .NET Parallel Programming

    All about Async/Await, System.Threading.Tasks, System.Collections.Concurrent, System.Linq, and more…

    .NET 4 - .NET Parallel Programming

    Are you using TPL Dataflow?  We’d love to know!
    Are you using TPL Dataflow? We’d love to know!
    March 6, 2012 Mar 6, 2012 03/6/12
    Stephen T
    Are you using the new System.Threading.Tasks.Dataflow.dll library, either from its CTPs or from the .NET 4.5 Developer Preview or Beta?  We'd love to hear about it, and if you have time, what your experiences have been (good or bad).  What kind of solution are you building, and how are you using TPL Dataflow in it?  Has the ...

    Comments are closed.0.NET 4.NET 4.5Async
    When “ExecuteSynchronously” doesn’t execute synchronously
    When “ExecuteSynchronously” doesn’t execute synchronously
    February 7, 2012 Feb 7, 2012 02/7/12
    Stephen T
    When creating a task continuation with ContinueWith, developers have the opportunity to provide a TaskContinuationOptions enum value, which could include the TaskContinuationOptions.ExecuteSynchronously flag.  ExecuteSynchronously is a request for an optimization to run the continuation task on the same thread that completed the ...

    Comments are closed.0.NET 4.NET 4.5Async
    FromAsync(asyncResult, …) vs FromAsync(beginMethod, …)
    FromAsync(asyncResult, …) vs FromAsync(beginMethod, …)
    February 6, 2012 Feb 6, 2012 02/6/12
    Stephen T
    The Task Parallel Library (TPL) provides a set of “FromAsync” helper methods that create a Task or a Task<TResult> to represent an invocation of an APM method pair, i.e. BeginXx / EndXx.  There are, however, two different flavors among these overloads: ones that accept an IAsyncResult “asyncResult” as the ...

    Comments are closed.0.NET 4.NET 4.5Async
    Building a custom GetOrAdd method for ConcurrentDictionary
    Building a custom GetOrAdd method for ConcurrentDictionary
    February 4, 2012 Feb 4, 2012 02/4/12
    Stephen T
    I was recently asked by a developer about getting some additional information out of ConcurrentDictionary<TKey,TValue>’s GetOrAdd method.  As a reminder, GetOrAdd either returns the value for a key currently in the dictionary, or if that key doesn’t have a value, it adds a value for the key as dictated by either a TValue...

    Comments are closed.0.NET 4.NET 4.5Coordination Data Structures
    Know Thine Implicit Allocations
    Know Thine Implicit Allocations
    February 3, 2012 Feb 3, 2012 02/3/12
    Stephen T
    For .NET 4.5, we’ve invested quite a bit of effort into performance, and in particular for the Task Parallel Library (Joe Hoag wrote a good paper covering some of these improvements).  We focused such effort on TPL because it is a core component used in async programming and at a foundational level for many libraries and ...

    Comments are closed.0.NET 4.NET 4.5
    Await, SynchronizationContext, and Console Apps: Part 2
    Await, SynchronizationContext, and Console Apps: Part 2
    January 21, 2012 Jan 21, 2012 01/21/12
    Stephen T
    Yesterday, I blogged about how you can implement a custom SynchronizationContext in order to pump the continuations used by async methods so that they may be processed on a single, dedicated thread.  I also highlighted that this is basically what UI frameworks like Windows Forms and Windows Presentation Foundation do with their message ...

    Comments are closed.0.NET 4.NET 4.5Async
    Implementing a SynchronizationContext.SendAsync method
    Implementing a SynchronizationContext.SendAsync method
    January 20, 2012 Jan 20, 2012 01/20/12
    Stephen T
    I recently saw two unrelated questions, the answers to which combine to form a potentially useful code snippet.The first question was about SynchronizationContext.  SynchronizationContext provides a Post method, which asynchronously schedules the supplied delegate and object state to be executed according to the SynchronizationContext&...

    Comments are closed.0.NET 4.NET 4.5Async
    FAQ on Task.Start
    FAQ on Task.Start
    January 14, 2012 Jan 14, 2012 01/14/12
    Stephen T
    Recently I’ve heard a number of folks asking about Task.Start, when and when not to use it, how it behaves,and so forth.  I thought I’d answer some of those questions here in an attempt to clarify and put to rest any misconceptions about what it is and what it does.1. Question: When can I use Task.Start?The Start instance ...

    Comments are closed.0.NET 4.NET 4.5Parallel Extensions
    PLINQ Queries That Run in Parallel in .NET 4.5
    PLINQ Queries That Run in Parallel in .NET 4.5
    November 10, 2011 Nov 10, 2011 11/10/11
    One interesting thing to know about PLINQ is that not all queries are guaranteed to execute in parallel (See PLINQ Queries That Run Sequentially for reference). You can think of the AsParallel method as a hint to run in parallel for query shapes that it believes will be faster. By default, PLINQ prefers to use a simple sequential algorithm ...

    Comments are closed.0.NET 4.NET 4.5Code Samples
    Crafting a Task.TimeoutAfter Method
    Crafting a Task.TimeoutAfter Method
    November 10, 2011 Nov 10, 2011 11/10/11
    Imagine that you have a Task handed to you by a third party, and that you would like to force this Task to complete within a specified time period. However, you cannot alter the “natural” completion path and completion state of the Task, as that may cause problems with other consumers of the Task. So you need a way to obtain a copy or “...

    Comments are closed.0.NET 4.NET 4.5Async
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