NSJSONSerialization thread safety

Question

Created Jul ’15

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Does anyone know if NSJSONSerialization is thread safe? Specifically, can I call JSONObjectWithData() concurrently from multiple background threads? The class docs don't mention anything about it:

https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSJSONSerialization_Class/

Nor does the threading summary page:

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html

Thanks!

Greg

Answered by Documentation Engineer in 28584022

Yes, NSJSONSerialization itself is thread safe. Calling it from multiple threads is fine (with the obvious exception that you can't do something like call it passing a mutable data and then mutate that data simultaneously).

It would be great if you could write up a bug report for our documentation to get that clarified in the Thread Safety section.

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Answer 1

Documentation Engineer OP

Apple

Jul ’15

Accepted Answer

Yes, NSJSONSerialization itself is thread safe. Calling it from multiple threads is fine (with the obvious exception that you can't do something like call it passing a mutable data and then mutate that data simultaneously).

It would be great if you could write up a bug report for our documentation to get that clarified in the Thread Safety section.

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Answer 2

GKBrown OP

Jul ’15

Will do. Thanks for your help!

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Answer 3

Documentation Engineer OP

Apple

Jul ’15

My pleasure, thanks for the question. 🙂 If you wouldn't mind posting the bug number here I'd like to keep an eye on it.

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