Douglas Katzman

Pass header as untagged word in alloc_immobile_fixedobj

Possibly avoid trying to call nonexistent openpty

Bit-pack mutex-owner and state into one slot if #+sb-futex

Fix typo noticed when grepping for "contest"

Use linguistically correct terminology

Add some remarks and a utility function

Balance out threads.pure test times

Use a barrier instead of CAS in mutex-owner