#!+(and sb-safepoint x86) (selfptr :c-type "struct thread *")
#!+sb-safepoint (csp-around-foreign-call :c-type "lispobj *")
#!+sb-safepoint (pc-around-foreign-call :c-type "lispobj *")
+ #!+win32 (synchronous-io-handle-and-flag :c-type "HANDLE" :length 1)
;; KLUDGE: On alpha, until STEPPING we have been lucky and the 32
;; bit slots came in pairs. However the C compiler will align
;; interrupt_contexts on a double word boundary. This logic should