CODEWITHSUNDEEP
iosmultithreadingcore-data
Tony Lin
Tony Lin

Reputation: 942

is NSManagedObjectContextDidSave or save thread safe?

I am having a structure of parent/child relationship context.

The parent is main context and the child is private concurrent context.

when the child does some changes and do save. The main context (object) receives the notification and do NSManagedObjectContextDidSave.

The problem is that I am wondering if this action is thread safe? because even it's wrapped in is't own context/thread (inside mainContext.performBlock), the other thread - child concurrent thread for example, can do the fetch. Will it corrupt the data when these 2 actions happen at exact time?

Upvotes: 1

Views: 101

Answers (1)

devgariya
devgariya

Reputation: 41

performBlock : synchronously performs the block on the context's queue. and is not thread safe in case of saving multiple records.

performBlockAndWait: synchronously performs the block on the context's queue. May safely be called subroutine.

Upvotes: 1

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