sb!unix::*unblock-deferrables-on-enabling-interrupts-p*
*interrupts-enabled*
*interrupt-pending*
+ #!+sb-thruption *thruption-pending*
+ #!+sb-safepoint *gc-safe*
+ #!+sb-safepoint *in-safepoint*
*free-interrupt-context-index*
sb!kernel::*gc-epoch*
sb!vm::*unwind-to-frame-function*