rb_thread_alloc  8728 eval.c             return rb_thread_start_0(fn, arg, rb_thread_alloc(rb_cThread));
rb_thread_alloc  8762 eval.c             rb_thread_t th = rb_thread_alloc(klass);
rb_thread_alloc  8792 eval.c             return rb_thread_start_0(rb_thread_yield, args, rb_thread_alloc(klass));
rb_thread_alloc  9315 eval.c             main_thread = rb_thread_alloc(rb_cThread);