다정한 강아지

GCD is the associated technology and provides an abstraction to threading, based on so-called dispatch queues. Blocks can be enqueued on these queues, and GCD handles all scheduling for you. It creates, reuses, and destroys background threads as it sees fit, based on system resources, to process each queue. Moreover, GCD provides easy-to-use solutions to common programming tasks, such as thread-..