Revision: 28592
                            
                                                            
                                    
                                        
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                        at July 10, 2010 03:45 by buzzerton
                            
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dispatch_queue_t get_my_background_queue()
{
	static dispatch_once_t once;
	static dispatch_queue_t my_queue;
	dispatch_once(&once, ^{
		my_queue = dispatch_queue_create("com.example.background", NULL);
	});
	return my_queue;
}
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Use dispatch_once within GCD
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Objective C