- `(if *dynamic-extent*
- (progn ,@forms)
- (let ((,label (gen-label)))
- ;; FIXME: The MAKE-EA noise should become a MACROLET macro
- ;; or something. (perhaps SVLB, for static variable low
- ;; byte)
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-interrupted*)
- (ash symbol-value-slot word-shift)
- ;; FIXME: Use mask, not minus, to
- ;; take out type bits.
- (- other-pointer-lowtag)))
- 0)
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-atomic*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- (fixnumize 1))
- ,@forms
- (inst mov (make-ea :byte :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-atomic*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- 0)
- ;; KLUDGE: Is there any requirement for interrupts to be
- ;; handled in order? It seems as though an interrupt coming
- ;; in at this point will be executed before any pending
- ;; interrupts. Or do incoming interrupts check to see
- ;; whether any interrupts are pending? I wish I could find
- ;; the documentation for pseudo-atomics.. -- WHN 19991130
- (inst cmp (make-ea :byte
- :disp (+ nil-value
- (static-symbol-offset
- '*pseudo-atomic-interrupted*)
- (ash symbol-value-slot word-shift)
- (- other-pointer-lowtag)))
- 0)
- (inst jmp :eq ,label)
- ;; if PAI was set, interrupts were disabled at the same
- ;; time using the process signal mask.
- (inst break pending-interrupt-trap)
- (emit-label ,label)))))
+ `(let ((,label (gen-label)))
+ (inst or (make-ea-for-symbol-value *pseudo-atomic-bits* :byte)
+ (fixnumize 1))
+ ,@forms
+ (inst xor (make-ea-for-symbol-value *pseudo-atomic-bits* :byte)
+ (fixnumize 1))
+ (inst jmp :z ,label)
+ ;; if PAI was set, interrupts were disabled at the same
+ ;; time using the process signal mask.
+ (inst break pending-interrupt-trap)
+ (emit-label ,label))))