[itssimon]

Thanks for your feedback!

Being able to instrument background tasks is a great idea that I would find useful for my own projects as well. I'll consider adding that to the roadmap!

The threading.Lock usage is a bit of a precaution that might not always be necessary. However, in cases where it's not necessary, the lock will always be uncontended and then be trivial to acquire. I'll think about whether that's worth optimizing.