On 6 Jan 2017, at 07:53, Mr Bee via swift-users <swift-users@swift.org> wrote:

> How to make my app alive to make the second queue finish its job?

The standard approach here is to park the main thread [1] in `dispatchMain()`.  
Then, when all your work is done, exit the process explicitly by calling 
`exit(_:)`.

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

[1] This doesn’t actually park the thread (at least on Darwin platforms) but 
instead does the rather neat trick of terminating the main thread while leaving 
the process alive (-:

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