GCDでキューの優先度をつけたい dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) DISPATCH_QUEUE_PRIORITY_HIGH DISPATCH_QUEUE_PRIORITY_DEFAULT DISPATCH_QUEUE_PRIORITY_LOW DISPATCH_QUEUE_PRIORITY_BACKGROUND `dispatch_queue_create()`

`dispatch_queue_create()``DISPATCH_QUEUE_PRIORITY_DEFAULT`

`dispatch_get_global_queue``dispatch_set_target_queue`


let queue = dispatch_queue_create("com.test", DISPATCH_QUEUE_SERIAL)
let targetPriorityQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0)
dispatch_set_target_queue(queue, targetPriorityQueue)


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Grand Central Dispatch (GCD) Reference