# dispatch_queue_create Creates a new dispatch queue to which you can submit blocks. ``` extern dispatch_queue_tdispatch_queue_create(const char *label, dispatch_queue_attr_t attr); ``` ## Parameters `label` A string label to attach to the queue to uniquely identify it in debugging tools such as Instruments, `sample`, stackshots, and crash reports. Because applications, libraries, and frameworks can all create their own dispatch queues, a reverse-DNS naming style (*com.example.myqueue*) is recommended. This parameter is optional and can be `NULL`. `attr` In macOS 10.7 and later or iOS 4.3 and later, specify [`DISPATCH_QUEUE_SERIAL`](/documentation/Dispatch/DISPATCH_QUEUE_SERIAL) (or `NULL`) to create a serial queue or specify [`DISPATCH_QUEUE_CONCURRENT`](/documentation/Dispatch/DISPATCH_QUEUE_CONCURRENT) to create a concurrent queue. In earlier versions, you must specify `NULL` for this parameter. ## Return Value The newly created dispatch queue. ## Discussion Blocks submitted to a serial queue are executed one at a time in FIFO order. Note, however, that blocks submitted to independent queues may be executed concurrently with respect to each other. Blocks submitted to a concurrent queue are dequeued in FIFO order but may run concurrently if resources are available to do so. If your app isn’t using ARC, you should call [`dispatch_release`](/documentation/Dispatch/dispatch_release) on a dispatch queue when it’s no longer needed. Any pending blocks submitted to a queue hold a reference to that queue, so the queue is not deallocated until all pending blocks have completed. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)