.NET Parallel Programming

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

Cancellation - .NET Parallel Programming

Cooperatively pausing async methods

January 13, 2013 Jan 13, 2013 01/13/13
Stephen Toub - MSFT
Recently I was writing an app that processed a bunch of files asynchronously.  As with the Windows copy file dialog, I wanted to be able to provide the user with a button that would pause the processing operation.To achieve that, I implemented a simple mechanism that would allow me to pass a “pause token” into the async method...

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 Feature? :: Delayed cancellation

November 4, 2010 Nov 4, 2010 11/4/10
Danny Shih
 We’re interested in adding support for scheduling cancellation.  For example: // Create a token source that will Cancel() after a delay var cts = new CancellationTokenSource(TimeSpan.FromMilliseconds(100));// And/or schedule a Cancel() call cts.CancelAfter(TimeSpan.FromMilliseconds(100));We’ve heard from many folks ...

Cancellation in Parallel Extensions

June 22, 2009 Jun 22, 2009 06/22/09
Mike Liddell
One of the great features that crosses all of Parallel Extensions types is a consistent approach to cancellation (see https://blogs.msdn.com/pfxteam/archive/2009/05/22/9635790.aspx). In this post we explore some of the ways cancellation is used in Parallel Extensions and explain the guidance we developed. The new cancellation system is a ...

.NET 4 Cancellation Framework

May 22, 2009 May 22, 2009 05/22/09
Mike Liddell
A very interesting addition to .NET 4 is a set of new types that specifically assist with building cancellation-aware applications and libraries. The new types enable rich scenarios for convenient and safe cancellation, and help simplify situations that used to be be difficult and error-prone and non-composable. The details of the new types ...