# dispatch_get_global_queue Returns a system-defined global concurrent queue with the specified quality-of-service class. ``` extern dispatch_queue_global_tdispatch_get_global_queue(intptr_t identifier, uintptr_t flags); ``` ## Parameters `identifier` The quality of service you want to give to tasks executed using this queue. Quality-of-service helps determine the priority given to tasks executed by the queue. You may specify the values `QOS_CLASS_USER_INTERACTIVE`, `QOS_CLASS_USER_INITIATED`, `QOS_CLASS_UTILITY`, or `QOS_CLASS_BACKGROUND`. Queues that handle user-interactive or user-initiated tasks have a higher priority than tasks meant to run in the background. In OS X 10.9 or earlier, you can specify one of the dispatch queue priority values, which are found in [`dispatch_queue_priority_t`](/documentation/Dispatch/dispatch_queue_priority_t) . These values map to an appropriate quality-of-service class. `flags` Flags that are reserved for future use. Always specify `0` for this parameter. ## Return Value The requested global concurrent queue. ## Discussion This function returns a queue suitable for executing tasks with the specified quality-of-service level. Calls to the [`suspend()`](/documentation/Dispatch/DispatchObject/suspend()), [`resume()`](/documentation/Dispatch/DispatchObject/resume()), and [`dispatch_set_context`](/documentation/Dispatch/dispatch_set_context) functions have no effect on the returned queues. Tasks submitted to the returned queue are scheduled concurrently with respect to one another. --- 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)