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# Dispatch Data Types

## Topics

### Data Types

[`typealias dispatch_group_t`](/documentation/Dispatch/dispatch_group_t)

A group of block objects submitted to a queue for asynchronous invocation.

[`typealias dispatch_io_t`](/documentation/Dispatch/dispatch_io_t)

A dispatch I/O channel.

[`typealias dispatch_object_t`](/documentation/Dispatch/dispatch_object_t)

A dispatch object.

[`typealias dispatch_queue_attr_t`](/documentation/Dispatch/dispatch_queue_attr_t)

Attributes describing the behaviors of a dispatch queue.

[`typealias dispatch_queue_serial_executor_t`](/documentation/Dispatch/dispatch_queue_serial_executor_t)

[`typealias dispatch_queue_t`](/documentation/Dispatch/dispatch_queue_t)

A lightweight object to which your application submits blocks for subsequent execution.

[`typealias dispatch_semaphore_t`](/documentation/Dispatch/dispatch_semaphore_t)

A dispatch semaphore object.


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