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Due to some self induced problems, I was able to crash my iPhone app and received the following error:
Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...
Resolving this problem isn't an issue, but the error message got me thinking...
I know what the main thread is, and I'm aware of how to switch contexts back to it. But, what is this "web thread"? I don't think I've ever heard that terminology before.
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The web thread is a single thread shared by all UIWebViews which temporarily blocks execution on the main thread while it's performing requests.
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