You can posix_spawn there without tcsetpgrp races, that is pretty cool. Still leading the way!

https://www.austingroupbugs.net/view.php?id=1044

https://developer.blackberry.com/native/reference/core/com.q...

Linux with the PREEMPT_RT patchset is pretty much a true RTOS nowadays. Though you still need to be careful in developing userspace to achieve true "hard" time bounds, and that's largely incompatible with a "desktop" workflow.