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May 7th, 0 0. Everyone appreciates a fast and responsive UI, and Visual Studio is microsoft visual studio 2015 has detected that an operation is blocking user input free exception.

Extensions that run in Visual Studio play a significant role in how responsive the IDE will be for its users. Visual Studio has been evolving over the past few cycles to not only improve performance, but also responsiveness during operations that may take a while to execute, offering cancellation or the ability to run these operations in the background while you can interact with the IDE in the meantime. IDE responsiveness during long-running operations requires these operations to be written asynchronously or off the UI thread, which can be challenging.

It can be very tempting to write code such as the above so that you can call DoSomethingAsync most of the time to provide a responsive UI, but call DoSomething when you have to do it synchronously. In this post, we outline modern guidelines for Visual Studio for managed code developers writing VS extensions regarding the use of async and multi-threaded code that avoids pitfalls such as the one above.

Then we prescribe sims university for free pc tools and coding patterns to use to avoid these pitfalls. With Visual Studio came the introduction of significant chunks of thwt code to the Visual Studio product itself.

This was also the version when the text editor was rewritten in managed code. Since адрес страницы Solution Explorer has been rewritten in managed code and the Javascript project system was introduced as an all-managed project system.

With that managed code came subtle but important differences in how services behaved and interacted, notwithstanding backward compatibility being a firm pillar. Relevant to this post iz differences in how threading rules operatjon components were implemented.

Operarion code running in another apartment e. This protected the COM component from having to deal with concurrent execution, but left it open to reentrancy being invoked while in an outbound call. This technique worked whether the caller was managed automatically or native code via the proxy stub that COM would generate for the caller. When those same COM components were rewritten in managed code C in most cases windows 10 blue screen of death keeps restarting free download of these automatic thread marshaling behaviors became less certain.

For instance, if native code called the rewritten managed COM component, then it would execute on the main thread since the native caller was typically already on the привожу ссылку thread, or since native code calls managed code through a COM proxy the call could get marshaled.

But if the caller and new service are both written in managed code, the CLR removes the COM marshaling interop boundary between the two components to improve performance.

This removal of the interop boundary meant that any assurance that the managed COM service might otherwise have of always executing on the UI thread was no longer guaranteed. As a result, the conscientious managed code developer writing VS components should either write thread-safe code or be sure that every public entrypoint marshals to the UI thread explicitly before invoking any internal code to help assure thread-safety. When everything was COM written in native code, marshaling to the UI thread was done microsoft visual studio 2015 has detected that an operation is blocking user input free posting a message to the windows message queue for the main thread and then blocking the calling thread until the call completes.

The main thread would pick up the message in normal course of its message microsoft visual studio 2015 has detected that an operation is blocking user input free, execute the code, and then return to the message pump.

In some cases the main thread was busy, and these messages would just wait until the main thread returned to its message pump. In a few cases, this work on the main thread was actually blocking the main thread from returning to its message pump waiting for some background etudio to complete its work, which in turn was blocked waiting for the main thread to do some work.

When managed microsoft visual studio 2015 has detected that an operation is blocking user input free needs to marshal a call to the UI thread in Visual Studio, ultimately the same approach would be taken as in native code.

But at an actual coding level fred tended to surface in either of two ways: SynchronizationContext. Post for asynchronous invocation, or relying on a truly native COM component to marshal the call to the UI thread and then call the managed code back from the new thread.

In fact one of the simplest ways of getting to the UI thread for a managed develop in VS inpuf been to use ThreadHelper. Internally this uses the method of calling a native COM service in order to get to the UI thread and then it invokes your delegate. The problems start when the адрес resolving code kicks in. So it lets them all in. Well, almost. Posted messages in the SynchronizationContext. The one or two fundamental ways to get to the UI thread notwithstanding, there were at least a dozen ways to get to the UI thread in VS each having slightly different behaviors, priorities, reentrancy levels, etc.

This made it very difficult for code to choose which method was appropriate, and often required that the code had complete knowledge of what scenario it was called in, which made it impossible to get right when the same code executed in multiple scenarios. The main thread may have been blocked on anything e. But if that work eventually calls into the same component that it interrupted, the results can be devastating.

Consider this operwtion. Code inspection may not suggest that this code microxoft vulnerable to threading issues. But the call to File. Open may result in the main thread blocking. This second execution of the method will also satisfy the file open count test and start opening a file. It will assign the result to the last element detectted the array, increment the field, and exit. Finally, the original call that was interrupted will finish its File.

This is remarkably similar to multi-threaded concurrency issues, but remarkably can be reproduced even though your method only ran on the UI thread, which allowed reentrancy. So we have two evils: deadlocks and reentrancy. Without reentrancy to the main thread we have deadlocks when the main thread is blocked on background threads that are in turn blocked on the main thread.

And with reentrancy we tend to get too much reentrancy leading to corruption, crashes and hangs. Letting fewer messages in tends to create deadlocks, whereas letting in more messages tends to create more reentrancy with their own crashes and hangs. Clearly there was a need for a systemic fix. In a very few cases such as async project load it was possible, but required use of the VS Task Library which was designed to work from native code rather than something that felt more C friendly.

Use of the managed-friendly TPL Tasks library that shipped with. NET 4. While the VS Task Library could avoid the deadlocks, it demanded that the code be VS specific instead hax being rehostable inside and outside Visual Studio. Wait or Task. To solve all of these problems deadlocks, reentrancy, and asyncwe are pleased to introduce the JoinableTaskFactory and related classes. They block unwanted reentrancy by turning off the message pump completely, but avoid deadlocks by knowing their own dependency chain and allowing related work in by a private channel to the UI thread.

Code written with the C async keyword also mostly just works unmodified, when originally invoked using the JoinableTaskFactory. There is now just one way we recommend to get to the UI thread that works all the time.

Fred note that most of these examples requires that you add a reference to Microsoft. Notice how the method retains thread affinity across awaits of adobe premiere cs5 tutorial hindi free async methods.

You can switch to the main thread and it sticks. Then microsoft visual studio 2015 has detected that an operation is blocking user input free switch to a threadpool thread and it likewise sticks.

When SaveWorkToDiskAsync completes its work and PerformDataAnalysisAsync resumes execution, it will be on the same type fre thread it was before, which is the threadpool in our case. This is very nice for information hiding.

At this point we recommend writing async code whenever you have an opportunity to. The threadpool is a scarce resource too. By default the CLR only provides as many threadpool threads as the user has cores. This often means 4 threads, but can be as low as 1 or 2 on netbooks and yes, some Visual Studio customers develop on netbooks. So studil a threadpool thread for more than a very brief time can delay the threadpool from serving other requests, sometimes for very long periods.

But what if one of your callers is not async and cannot be changed to be async? There are valid cases for this, such as when your caller is implementing a public interface that has already привожу ссылку. If you have ever tried to call an async method from a synchronous one, you may have tried forcing synchronous execution by calling Task. And you probably found that it deadlocked. You can use the JoinableTaskFactory.

Microsoft visual studio 2015 has detected that an operation is blocking user input free method to avoid deadlocks in these cases:. The above Run method will block the calling blockijg until Детальнее на этой странице has completed.

Join on its result. This way, you can potentially kick onput work asynchronously and then later block the UI thread if you need to while it completes. Using the JoinableTaskFactory requires that you follow three rules in the managed code that you write:. In particular, no method is allowed to synchronously marshal work to another thread blocking while that work is done. Synchronous blocks in general are to be avoided whenever possible.

See the Appendix section for tips on identifying when this is necessary. If ever awaiting work that was started earlier, that work must be Join ed. For example, one ccs for windows 10 kicks off some asynchronous work that may later become synchronously blocking:.

Note however that this extra step is not necessary when awaiting is done immediately after kicking off an asynchronous operation. In particular, no method should call. Wait or. Result on an incomplete task. A failure to follow any of the above rules may result in your code causing Visual Studio to deadlock. When writing asynchronous code, analyzing deadlocks requires a new set of skills, which we may document in a follow-up post on this blog if there is interest.

This is how ASL asynchronous solution load was built for all the project bpocking that were written in native code. But it does let you schedule synchronous methods for execution on background threads with continuations on the main thread, thereby achieving an async-like effect, just with a bit more work. The VS Task Library changes the behavior of some things like cancellation and task completion in subtle but important ways.

But if you call IVsTask. Wait or IVsTask. GetResultVS will intelligently schedule tasks that require the UI thread to avoid deadlocks in most cases. This deadlock-resolving trait is similar to the Operatoon.

 
 

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