CancellationCancellation Handling for Asynchronous Tasks in SwiftLicense: NOASSERTIONSwiftcdTaskQueueA TaskQueue controls the execution of asynchronous functions.License: NOASSERTIONSwiftFutureLibFutureLib is a pure Swift 2 library implementing Skala-like Futures & PromisesLicense: Apache 2SwiftRXPromiseA thread safe implementation of the Promises/A+ specification in Objective-C with extensions.License: Apache 2Objective C++