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gistfile1.txt

dispatch_queue_t callerQueue = dispatch_get_current_queue();
dispatch_retain(callerQueue);

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
	
	// Do the work in the other thread...
	// Example: NSArray* items = parseJSON(data);
	
	dispatch_async(callerQueue, ^{
		
		// Report results to the caller...
		// Example: [self didParseItems:items];

		dispatch_release(callerQueue);
	});
});