-extern void interrupt_internal_error(int, siginfo_t*, os_context_t*,
- boolean continuable);
-extern boolean handle_guard_page_triggered(os_context_t *,void *);
-extern boolean interrupt_maybe_gc(int, siginfo_t*, void*);
+extern void interrupt_internal_error(os_context_t*, boolean continuable);
+extern boolean handle_guard_page_triggered(os_context_t *,os_vm_address_t);
+extern boolean maybe_defer_handler(void *handler, struct interrupt_data *data,
+ int signal, siginfo_t *info,
+ os_context_t *context);
+#if defined LISP_FEATURE_GENCGC
+/* assembly language stub that executes trap_PendingInterrupt */
+extern void do_pending_interrupt(void);
+#endif
+