To jog your memory and for the curious reading this, a chapter of the new 'learn Ada' interactive tutorial by AdaCore introduces tasking: https://learn.adacore.com/courses/intro-to-ada/chapters/task...

The whole interactive book deserves a look. You can then jump to the Spark book :-D https://learn.adacore.com/courses/intro-to-spark/index.html that sadly doesn't seem to talk about tasking but Spark supports part of it.

I'm actually looking forward the next few years, as AdaCore seems to be working on memory ownership-based guarantees a la rust (at least partially) and this might make Ada (or Spark in a first pass) a good candidate for truly fearless concurrency :-D.