When are threads created for Scala actor's reacts?

Question

After reading about using react in actors in Scala, I thought react\'s would share the same thread given there weren\'t multiple react\'s

Answer 1

Don't assume a separate thread per Actor. The Scala machinery creates a pool of worker threads and only grows that pool if the size of 'blocked' Actors is greater than the pool size. When your actor calls receive, it's in a blocked state until it receives its message.