thread_start     4745 thread.c           rb_define_singleton_method(rb_cThread, "start", thread_start, -2);
thread_start     4746 thread.c           rb_define_singleton_method(rb_cThread, "fork", thread_start, -2);
thread_start      869 thread_pthread.c   thread_start:
thread_start      896 thread_pthread.c 	    goto thread_start;