I'm writing an app that performs actions in a web browser automatically on user's behalf. Currently my app uses OperationQueue to perform asynchronous work. I'm trying to rewrite the app to use async/await instead. Note, that it is necessary for my app to limit the number of concurrently executing work items. Otherwise the app may run into server throttling issues. However, I can't find an equivalent to OperationQueue's maxConcurrentOperationCount parameter in the new concurrency model. Is there a way to limit the number of concurrently running "lanes" of execution without resorting to using OperationQueue / DispatchQueue / NSLock ?