+(define-alien-routine ("protect_control_stack_guard_page"
+ %protect-control-stack-guard-page)
+ sb!alien:void
+ (thread-sap system-area-pointer)
+ (protect-p sb!alien:int))
+(defun protect-control-stack-guard-page (n)
+ (%protect-control-stack-guard-page
+ (sb!thread::thread-%sap sb!thread:*current-thread*) (if n 1 0)))