.NET Parallel Programming

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

Code Samples - .NET Parallel Programming

Implementing Then with Await

August 15, 2012 Aug 15, 2012 08/15/12
Stephen Toub - MSFT
In a post a while ago, I talked about sequential composition of asynchronous operations.  Now that we have the async/await keywords in C# and Visual Basic, such composition is trivial, and async/await are indeed the recommended way to achieve such composition with these languages.However, in that post I also described a few “Then&...

Async Targeting Pack for Visual Studio 11 now available for .NET 4 and Silverlight 5

April 26, 2012 Apr 26, 2012 04/26/12
Stephen Toub - MSFT
We’re happy to announce that you can now download an Async Targeting Pack for Visual Studio 11 that lets you target .NET 4 and Silverlight 5.  The included DLLs address the previously discussed issue of the Visual Studio 11 Beta compilers being incompatible with the AsyncCtpLibrary* DLLs from the Async CTP; with this targeting pack...

Implementing a simple ForEachAsync, part 2

March 5, 2012 Mar 5, 2012 03/5/12
Stephen Toub - MSFT
After my previous post, I received several emails and comments from folks asking why I chose to implement ForEachAsync the way I did.  My goal with that post wasn’t to prescribe a particular approach to iteration, but rather to answer a question I’d received… obviously, however, I didn’t provide enough background...

Implementing a simple ForEachAsync

March 4, 2012 Mar 4, 2012 03/4/12
Stephen Toub - MSFT
Jon Skeet recently asked me how I might go about implementing the following “asynchronous ForEach” behavior: Given what we now know about SemaphoreSlim from my previous post, here’s one way to achieve this: public static Task ForEachAsync<TSource, TResult>(     this IEnumerable<TSource...

Paper :: Guide to Implementing Custom TPL Dataflow Blocks

December 5, 2011 Dec 5, 2011 12/5/11
Danny Shih
TPL Dataflow includes a number of built-in, already-implemented blocks that target the most common scenarios.  Additionally, some flexibility is provided by the set of options that may be used to tweak block behaviors.  However, a developer may still choose to implement a custom block for advanced scenarios where the built-in ones ...

Coalescing CancellationTokens from Timeouts

December 3, 2011 Dec 3, 2011 12/3/11
Stephen Toub - MSFT
In the .NET Framework 4.5 Developer Preview, you’ll find that CancellationTokenSource now has timeout support built directly into its implementation.  This makes it very easy to create a token that will automatically have cancellation requested after a particular time interval, e.g. public static CancellationToken FromTimeout(int ...

New in .NET 4.5: ThreadLocal.Values

November 10, 2011 Nov 10, 2011 11/10/11
Igor Ostrovsky - MSFT
Available since .NET 4, ThreadLocal<T> is a container that holds a separate value for every thread. In practice, ThreadLocal<T> is often convenient for storing per-thread counters, resources, or partial results. As mentioned earlier on this blog, we have been thinking about adding a Values property to enumerate over the values ...

PLINQ Queries That Run in Parallel in .NET 4.5

November 10, 2011 Nov 10, 2011 11/10/11
Igor Ostrovsky - MSFT
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 ...

Crafting a Task.TimeoutAfter Method

November 10, 2011 Nov 10, 2011 11/10/11
Joe Hoag
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 “...