Linux for developing Ada real-time applications
GNAT and RT Linux

GNAT handles everything
One module with all the Ada code
Annex D compliant built-in scheduler
Full Annex D support being introduced
Protected objects with priority ceiling
Abortion and SMP support have yet to be added

Restrictions due to RT Linux
No dynamic memory allocation
No dynamic task creation
Limited communication with non-RT tasks
No sharing of protected objects
Real-time FIFOs only
Why not using asynchronous RPCs?