Synchronously performs a given block on the receiver’s queue.
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- (void)performBlockAndWait:(void (^)(void))block;
The block to perform.
You use this method to send messages to managed objects if the context was initialized using NSPrivateQueueConcurrencyType or NSMainQueueConcurrencyType.
This method may safely be called reentrantly.
Asynchronously performs a given block on the receiver’s queue.