Questions re: multitasking/threading

I’m looking for MCUs that can multitask/thread. I need two threads for my project - one to send out timed pulses without interruption, and another for all the stuff that is usually in loop().

Does the XIAO RA4M1 support multiple threads, if so, how many?

EDIT I just found that my XIAO SAMD21 can thread, I will have a look, I have already a couple of them waiting for something to do.

Seems a bit hard to find this information, how is threading called in the Arduino programming?

EDIT found some libraries…