[igt-dev] [PATCH i-g-t 04/10] tests/syncobj_timeline: add more timeline tests

[Chris Wilson]

Quoting Lionel Landwerlin (2019-11-20 21:21:37)
> +struct checker_thread_data {
> +       int fd;
> +       uint32_t syncobj;
> +       bool running;
> +       bool started;
> +};
> +
> +static void *
> +checker_thread_func(void *_data)
> +{
> +       struct checker_thread_data *data = _data;
> +       uint64_t value, last_value = 0;
> +
> +       while (data->running) {

while (READ_ONCE(data->running)) {

to make sure gcc does not get too clever (surprisingly it does happen,
but I expect syncobj_timeline_query() to be a treated as a barrier as it
will have a syscall).

> +               syncobj_timeline_query(data->fd, &data->syncobj, &value, 1);
> +
> +               data->started = true;
> +
> +               igt_assert(last_value <= value);
> +               last_value = value;
> +       }
> +
> +       return NULL;
> +}