[PATCH wayland 1/2] tests: add test for callback serials

[Bryce Harrington]

On Mon, Oct 27, 2014 at 09:14:40AM +0100, Marek Chalupa wrote:
> The callback returns always with the same serial,
> which is not right (it's serial, not constant...).
> This test highlights the bug.
> 
> Signed-off-by: Marek Chalupa <mchqwerty at gmail.com>
> ---
>  tests/display-test.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/tests/display-test.c b/tests/display-test.c
> index a1e45b1..eb4ba1c 100644
> --- a/tests/display-test.c
> +++ b/tests/display-test.c
> @@ -593,3 +593,58 @@ TEST(threading_read_after_error_tst)
>  
>  	display_destroy(d);
>  }
> +
> +static void
> +sync_callback(void *data, struct wl_callback *wl_callback, uint32_t serial)
> +{
> +	int *got = data;
> +	static uint32_t last_serial = 0;
> +
> +	/* if this is the first callback, just copy the value of serial */
> +	if (*got == 0)
> +		last_serial = serial;
> +	else
> +		++last_serial;
> +
> +	/* since we only call display_sync, nothing else can increase the
> +	 * serial, so the serails must be sequential */

sp. serials

> +	assert(serial == last_serial
> +	       && "Serial is not sequential");
> +
> +	++(*got);

I'm a bit confused about the intention of 'got', is it just a counter
for how many times the callback is called?  Would sync_callback_count
be a clearer variable name?

> +}
> +
> +static const struct wl_callback_listener sync_listener = {
> +	sync_callback
> +};
> +
> +#define CB_NUM 1000
> +static void
> +callback_serial_tst_main(void)
> +{
> +	int i, got = 0;
> +	struct wl_callback *cb;
> +	struct client *client = client_connect();

'client' maybe not a good choice of variable name since it's also the
type name.  'c' seems to be convention here, so maybe:

	struct client *c = client_connect();

> +	for (i = 0; i < CB_NUM; ++i) {
> +		cb = wl_display_sync(client->wl_display);
> +		wl_callback_add_listener(cb, &sync_listener, &got);
> +	}
> +
> +	wl_display_flush(client->wl_display);
> +	wl_display_roundtrip(client->wl_display);
> +
> +	assert(got == CB_NUM && "Lost some callback");
> +
> +	client_disconnect(client);
> +}
> +
> +TEST(callback_serial_tst)
> +{
> +	struct display *d = display_create();
> +
> +	client_create(d, callback_serial_tst_main);
> +	display_run(d);
> +
> +	display_destroy(d);
> +}
> -- 
> 1.9.3
> 
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Other than the few quibbles, looks quite good.
And cheers for adding a test with the bugfix.  :-)

Reviewed-by: Bryce Harrington <b.harrington at samsung.com>

Bryce