Thread#pending_interrupt?

static VALUE
rb_thread_pending_interrupt_p(int argc, VALUE *argv, VALUE target_thread)
{
    rb_thread_t *target_th = rb_thread_ptr(target_thread);

    if (!target_th->pending_interrupt_queue) {
        return Qfalse;
    }
    if (rb_threadptr_pending_interrupt_empty_p(target_th)) {
        return Qfalse;
    }
    if (rb_check_arity(argc, 0, 1)) {
        VALUE err = argv[0];
        if (!rb_obj_is_kind_of(err, rb_cModule)) {
            rb_raise(rb_eTypeError, "class or module required for rescue clause");
        }
        return RBOOL(rb_threadptr_pending_interrupt_include_p(target_th, err));
    }
    else {
        return Qtrue;
    }
}