NSPrivateQueueConcurrencyType serial or concurrent?

Question

As the title says, the question is, if a NSManagedObjectContext with concurrency type NSPrivateQueueConcurrencyType is serial or concurrent.

More specifically, if I call

[managedObjectContext performBlock:^{

}];

with a long running task, will other calls to that context with performBlock be blocked until the first one finished?

Answer 1

It is serial queue from Apple docs.

Or you can simply try to run this code and see the result. The numbers will be printed serially.

    let privateMOC = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
    privateMOC.perform {
        for i in 0...8000 {
            if i.isMultiple(of: 3000) {
                print("1")
            }
        }
    }
    privateMOC.perform {
        for i in 0...8000 {
            if i.isMultiple(of: 3000) {
                print("2")
            }
        }
    }