Fiber::Scheduler#close

VALUE
rb_fiber_scheduler_close(VALUE scheduler)
{
    RUBY_ASSERT(ruby_thread_has_gvl_p());

    VALUE result;

    // The reason for calling `scheduler_close` before calling `close` is for
    // legacy schedulers which implement `close` and expect the user to call
    // it. Subsequently, that method would call `Fiber.set_scheduler(nil)`
    // which should call `scheduler_close`. If it were to call `close`, it
    // would create an infinite loop.

    result = rb_check_funcall(scheduler, id_scheduler_close, 0, NULL);
    if (!UNDEF_P(result)) return result;

    result = rb_check_funcall(scheduler, id_close, 0, NULL);
    if (!UNDEF_P(result)) return result;

    return Qnil;
}