extern boolean interrupt_maybe_gc(int, siginfo_t*, void*);
#ifdef LISP_FEATURE_SB_THREAD
extern void interrupt_thread_handler(int, siginfo_t*, void*);
extern void sig_stop_for_gc_handler(int, siginfo_t*, void*);
extern boolean interrupt_maybe_gc(int, siginfo_t*, void*);
#ifdef LISP_FEATURE_SB_THREAD
extern void interrupt_thread_handler(int, siginfo_t*, void*);
extern void sig_stop_for_gc_handler(int, siginfo_t*, void*);