You can create your own queue using dispatch_queue_create
Objective-C
dispatch_queue_t queue = dispatch_queue_create("com.example.myqueue", DISPATCH_QUEUE_SERIAL);
Swift
// Before Swift 3
let queue = dispatch_queue_create("com.example.myqueue", DISPATCH_QUEUE_SERIAL)
// Swift 3
let queue = DispatchQueue(label: "com.example.myqueue") //default is serial queue, unless .concurrent is specified as an attribute otherwise