Last time, we looked at building an AsyncSemaphore. Here, we’ll look at building support for an async mutual exclusion mechanism that supports scoping via ‘using’.As mentioned in the previous post, semaphores are great for throttling and resource management. You can give a semaphore an initial count of the number ...
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 ...
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...
The C# and Visual Basic compilers implement support for async/await by generating code that utilizes some specific types in the underlying framework. These types include the “awaiters” used to await things (like Tasks) as well as the “builders” used in handling the lifetime of an async method’s invocation. ...
Thanks to everyone who attended my "The Zen of Async" presentation on Thursday at the MVP Summit. As I've had several requests, here are the slides and code for the talk. Toub_MVPSummit2012_ZenOfAsync.zip...
From time to time, I receive questions from developers which highlight either a need for more information about the new “async” and “await” keywords in C# and Visual Basic. I’ve been cataloguing these questions, and I thought I’d take this opportunity to share my answers to them.Conceptual OverviewWhere can ...
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 ...
Every now and then, I get this question: “is it ok to use nested Parallel.For loops?” The short answer is “yes.” As is often the case, the longer answer is, well, longer. Typically when folks ask this question, they’re concerned about one of two things. First, they’re concerned that each nested loop will assume it “owns ...
When I discuss the new async language features of C# and Visual Basic, one of the attributes I ascribe to the await keyword is that it “tries to bring you back to where you were.” For example, if you use await on the UI thread of your WPF application, the code that comes after the await completes should run back on that same UI ...
The Task-based Async Pattern (TAP) isn’t just about asynchronous operations that you initiate and then asynchronously wait for to complete. More generally, tasks can be used to represent all sorts of happenings, enabling you to await for any matter of condition to occur. We can even use Tasks to build simple coordination ...
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