Creates a new dispatch source object that you use to track custom app data.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 9.0+
- Mac Catalyst 13.0+Beta
The dispatch queue to use when executing the installed handlers.
After creating the dispatch source, use the methods of the
DispatchSourceProtocol protocol to install the event handlers you need. The returned dispatch source is in the inactive state initially. When you are ready to begin processing events, call its
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