Re: [Vala] Need help in debugging async code

[michele dionisio gmail com]

A crash can happes if you call the callback to wakeup before the yield. Are you completly sure that your code 
is completly asyncrounous in any condition.

Il ven mar 18 01:05:05 2016 GMT+0100, Felipe Lavratti scrive:
> Hey Marcin,
>
> Just wondering,
> Is your program using threading or any threaded object that is handled in
> this part of code?
>
>
>
>
> On Thu, Mar 17, 2016 at 20:44 marcin saepia net <marcin saepia net> wrote:
>
> > Hi all,
> >
> > I encounter random crashes in my app, which (it's my guess) is triggered
> > when I call callback in async method.
> >
> > Such as
> >
> > public async void something() {
> >   SourceFunc callback_ref = something.callback;
> >
> >   do_something_that_calls_another_callback(() => {
> >     callback_ref(); // here's crash happening. approximately 1/10000 calls
> >   });
> >
> >   yield;
> > }
> >
> > The chain of async calls is nested.
> >
> > I get stack traces like this:
> >
> > https://gist.githubusercontent.com/mspanc/9ca4795f48e56149a9a2/raw/9be534c66409b26820a66d54f8610f2aa6306e1e/gistfile1.txt
> >
> > It's rather hard to believe that such basic thing as memory allocation is
> > broken in GLib.
> >
> > Crash happens totally randomly, once per 1-3 days. You can imagine how hard
> > is to collect test cases. I am trying to hunt more stack traces in order to
> > find a pattern, but maybe in the meantime anyone here can share experience
> > in debugging such issues?
> >
> > Or maybe there are some well-known bugs or antipatterns related to async
> > functions that should be avoided?
> >
> > I use GLib 2.44 & Vala 0.30.0. I will try to upgrade to 2.46 but I see
> > nothing related in the changelog.
> >
> > m.
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