exec on thread
http://stackoverflow.com/questions/11582223/ios-ensure-execution-on-main-thread
run task: dispatch queue
http://developer.apple.com/library/ios/#documentation/General/Conceptual/ConcurrencyProgrammingGuide/OperationQueues/OperationQueues.html#//apple_ref/doc/uid/TP40008091-CH102-SW1
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