On Sat, Oct 24, 2009 at 4:44 PM, pHilipp Zabel <philipp.za...@gmail.com> wrote:
> On Sat, Oct 24, 2009 at 12:59 PM, Jan Hudec <b...@ucw.cz> wrote:
>> On Fri, Oct 23, 2009 at 15:31:53 +0200, pHilipp Zabel wrote:
>>> Hi,
>>>
>>> I'd like to call a delegate function from an async function, like this:
>>>
>>> class AsyncDelegate {
>>> delegate void TestFunc ();
>>>
>>> void test_func () {
>>> print ("delegate\n");
>>> }
>>>
>>> async void test_async (TestFunc f) {
>>
>> Can you try it with
>>
>> async void test_async (owned TestFunc f) {
>>
>> ?
>
> Thanks, but that doesn't work either.
> I filed a bug, details at https://bugzilla.gnome.org/show_bug.cgi?id=599487
>
> The first problem is that the AsyncDelegateTestFunc delegate typedef
> in the generated code appears only after the struct
> _AsyncDelegateTestAsyncData, in which it is referenced.
>
> The second problem is that the struct _AsyncDelegateTestAsyncData is
> missing a GDestroyNotify f_target_destroy_notify member, even after I
> add the owned keyword as you suggest.
With Jürg's help I came up with a patch
(http://bugzilla-attachments.gnome.org/attachment.cgi?id=146187) that
fixes both problems.
I still get the critical error message, though:
** (valac:1106): CRITICAL **: vala_data_type_get_value_owned: assertion `self
!= NULL' failed
Any idea where this is coming from?
>>> print ("async enter\n");
>>> Idle.add (test_async.callback);
>>> yield;
>>> f ();
>>> print ("async leave\n");
>>> }
>>>
>>> static int main (string[] args) {
>>> var loop = new GLib.MainLoop (null, false);
>>> var app = new AsyncDelegate ();
>>>
>>> app.test_async.begin (app.test_func);
>>> print ("loop\n");
>>> loop.run ();
>>>
>>> return 0;
>>> }
>>> }
>>>
>>> But Vala 0.7.7 doesn't like that at all:
>>>
>>> ** (valac:7627): CRITICAL **: vala_data_type_get_value_owned:
>>> assertion `self != NULL' failed
>>> /home/ph5/vala/async-delegate/async-delegate.vala.c:44: error:
>>> expected specifier-qualifier-list before Б─≤AsyncDelegateTestFuncБ─≥
>>> [...]
>>> Compilation failed: 1 error(s), 0 warning(s)
>>
>> It can't work with unowned delegate (add 'owned' as mentioned above), because
>> vala can't guarantee the invocant will be valid by the time the async
>> function gets to call it.
>>
>> However, vala should report an understandable error, so filing a bug would be
>> appropriate.
>
> I see. I filed a second bug for the error messages:
> https://bugzilla.gnome.org/show_bug.cgi?id=599488
And for this one I've got a patch proposal, too:
http://bugzilla-attachments.gnome.org/attachment.cgi?id=146188
regards
Philipp
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