rb_thread_kill    454 include/ruby/intern.h VALUE rb_thread_kill(VALUE);
rb_thread_kill   2287 thread.c           return rb_thread_kill(th);
rb_thread_kill   2307 thread.c           return rb_thread_kill(th->self);
rb_thread_kill   4770 thread.c           rb_define_method(rb_cThread, "kill", rb_thread_kill, 0);
rb_thread_kill   4771 thread.c           rb_define_method(rb_cThread, "terminate", rb_thread_kill, 0);
rb_thread_kill   4772 thread.c           rb_define_method(rb_cThread, "exit", rb_thread_kill, 0);