Constants indicating the frequency with which a dispatch queue autoreleases objects.
SDKs
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 8.0+
Framework
- Dispatch
Declaration
enum AutoreleaseFrequency
EnumerationDispatch
Dispatch
Topics
Autorelease Frequencies
case inheritThe queue inherits its autorelease frequency from its target queue.
case workThe queue configures an autorelease pool before the execution of a block, and releases the objects in that pool after the block finishes executing.
case neverThe queue does not set up an autorelease pool around executed blocks.
Operator Functions
static func != (DispatchReturns a Boolean value indicating whether two values are not equal.
Instance Properties
Instance Methods
See Also
Creating a Dispatch Queue
class var main: DispatchThe dispatch queue associated with the main thread of the current process.
class func global(qos: DispatchReturns the global system queue with the specified quality-of-service class.
init(label: String, qos: DispatchCreates a new dispatch queue to which you can submit blocks.
enum DispatchQuality-of-service classes that specify the priorities for executing tasks.
struct DispatchAttributes that define the behavior of a dispatch queue.
class OSA system-provided dispatch queue that schedules tasks for serial execution on the app's main thread.
class OSA system-provided dispatch queue that schedules tasks for concurrent execution.
class OSA custom dispatch queue that schedules tasks for serial execution on an arbitrary thread.
class OSA custom dispatch queue that schedules tasks for concurrent execution.
typealias dispatchA dispatch queue that is bound to the app's main thread and executes tasks serially on that thread.
typealias dispatchA dispatch queue that executes tasks concurrently using threads from the global thread pool.
typealias dispatchA dispatch queue that executes tasks serially in first-in, first-out (FIFO) order.
typealias dispatchA dispatch queue that executes tasks concurrently and in any order, respecting any barriers that may be in place.