rb_thread_sleep_deadly  449 include/ruby/intern.h void rb_thread_sleep_deadly(void);
rb_thread_sleep_deadly 2404 thread.c           rb_thread_sleep_deadly();
rb_thread_sleep_deadly  776 thread_sync.c      rb_thread_sleep_deadly();
rb_thread_sleep_deadly 2197 variable.c     	    rb_thread_sleep_deadly();