Semaphore thread throttling with async/await

Question

I recently came across an example of throttling threads for async/await calls. After analyzing and playing with the code on my machine, I came up with a slightly different way o

Answer 1

It's not much leaner, just a little bit. Usually, I avoid ContinueWith in async code because await is cleaner and has more async-friendly default semantics. Optimize for developer time first, then optimize for other considerations.

Your code does change the semantics slightly: in the original code, LongRunningTask was executed from a thread pool context, and in your code it's executed from whatever the CallThrottledTasks context is. Also, your code won't propagate exceptions from LongRunningTask cleanly; Task<T>.Result will wrap exceptions in AggregateException, while await will not do any wrapping.