Multiple processes sharing PINCache about pincache HOT 5 OPEN

No, it uses a runtime lock to protect file access. However, that sounds like a good enhancement to be made!

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Looked into using NSFileCoordinator a bit.

One problem:
"If your app enters the background with an active file presenter, any other processes that perform a coordinated read or write on the presented file can deadlock. To prevent this situation, call removeFilePresenter: to remove the file presenter in the applicationDidEnterBackground: method or in response to a UIApplicationDidEnterBackgroundNotification notification. Call addFilePresenter: to add the file presenter again in the applicationWillEnterForeground: method or in response to a UIApplicationWillEnterForegroundNotification notification."

This may be an issue with extensions as notifications for backgrounding don't occur if I'm not mistaken.

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Extensions do actually get little-known lifecycle notifications:

NSExtensionHostDidBecomeActiveNotification
NSExtensionHostDidEnterBackgroundNotification
NSExtensionHostWillEnterForegroundNotification
NSExtensionHostWillResignActiveNotification

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Ahh! Nice!

The next concern I have is around performance. That's the next question to tackle :)

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Has this been implemented?

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