rb_threadptr_check_signal  169 eval.c             rb_threadptr_check_signal(th);
rb_threadptr_check_signal  515 signal.c       	    rb_threadptr_check_signal(GET_VM()->main_thread);
rb_threadptr_check_signal 4005 thread.c           rb_threadptr_check_signal(vm->main_thread);
rb_threadptr_check_signal 1145 vm_core.h      void rb_threadptr_check_signal(rb_thread_t *mth);