iOS start Background Thread

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If you use performSelectorInBackground:withObject: to spawn a new thread, then the performed selector is responsible for setting up the new thread’s autorelease pool, run loop and other configuration details – see “Using NSObject to Spawn a Thread” in Apple’s Threading Programming Guide.

You’d probably be better off using Grand Central Dispatch, though:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    [self getResultSetFromDB:docids];
});

GCD is a newer technology, and is more efficient in terms of memory overhead and lines of code.

Updated with a hat tip to Chris Nolet, who suggested a change that makes the above code simpler and keeps up with Apple’s latest GCD code examples.

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