+ #!+(or hpux) sb!vm::*c-lra*
+ *allow-with-interrupts*
+ sb!unix::*unblock-deferrables-on-enabling-interrupts-p*
+ *interrupts-enabled*
+ *interrupt-pending*
+ #!+sb-thruption *thruption-pending*
+ #!+sb-safepoint *gc-safe*
+ #!+sb-safepoint *in-safepoint*