There is one more very interesting project under the swift umbrella: <a href="https:&#x2F;&#x2F;github.com&#x2F;apple&#x2F;swift-corelibs-libdispatch" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;apple&#x2F;swift-corelibs-libdispatch</a> so now swift should have a useful approach to concurrency.