How do the JavaScript thread and the Silverlight UI thread interact with each other?

While JavaScript operates on a single thread, Silverlight does not follow the same restrictions. However, when it comes to the interaction between JavaScript and Silverlight, it is crucial that communication occurs on the Silverlight UI thread.

The relationship between the Silverlight UI thread and the JavaScript thread raises questions about whether they are considered the same thread or if they function as separate entities with interactions relying on their respective event loops. This leads to inquiries about potential blocking behavior, especially when one thread needs to wait for the other (for instance, when calling JavaScript from Silverlight). Essentially, can JavaScript run concurrently with Silverlight actions on the UI thread? And can multiple instances of Silverlight running on the same page have their UI threads operating simultaneously?

javascript.netmultithreadingsilverlightui-thread

Answer №1

Although I have not personally worked with Silverlight, my experience with Java Applets and Flash has given me insights from a related perspective.

As you mentioned, JavaScript operates on a single thread, meaning that anything causing it to block will halt all other processes and actions. This can even lead to the browser becoming unresponsive at times, although newer browsers are improving by separating tabs into different processes.

In contrast, threads within a plugin like Silverlight operate independently from JavaScript in the browser. However, interactions between them may be blocking. If Silverlight's UI thread becomes blocked while communicating with native JS, other tasks on that thread will pause until completion. Other threads will remain unaffected and continue functioning normally.

In response to your question regarding whether JS can run concurrently alongside actions on the Silverlight UI thread, theoretically, yes. Since they function with separate runtimes and do not need to communicate with each other (leading to potential blocks), they should be able to operate smoothly in isolation.

I would assume the same principle applies to running multiple instances of Silverlight on the same page, but this would likely depend on specific architectural considerations that I cannot definitively address.

I hope this response proves helpful!

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