You want to create your own uniquely named dispatch queues.
With GCD, you can create your own serial dispatch queues (see Recipe 7.0 to read about serial queues). Serial dispatch queues run their tasks in a first-in-first-out (FIFO) fashion. The asynchronous tasks on serial queues will not be performed on the main thread, however, making serial queues highly desirable for concurrent FIFO tasks.
All synchronous tasks submitted to a serial queue will be executed on the current thread being used by the code that is submitting the task, whenever possible. But asynchronous tasks submitted to a serial queue will always be executed on a thread other than the main thread.
We’ll use the
dispatch_queue_create function to create
serial queues. The first parameter in this function is a C string
char *) that will uniquely identify
that serial queue in the system. The reason I am
emphasizing system is because this identifier is a
system-wide identifier, meaning that if your app creates a new serial
queue with the identifier of
somebody else’s app does the same, the results of creating a new serial
queue with the same name are undefined by GCD. Because of this, Apple
strongly recommends that you use a reverse DNS format for identifiers.
Reverse DNS identifiers are usually constructed in this way:
IDENTIFIER. For instance, I could create two serial ...