Re: [Chicken-users] Re: C hang Solved (was Re: Calling out to C causing hang)

[Jonah Beckford]

Sorry about that.  I have been out of commission for a bit, and just 
browsed the Chicken email.  When I get caught up (probably tomorrow), I 
will give an informed response ...

Jonah

At 03:39 PM 07/04/2003 +0200, Felix Winkelmann wrote:
> Chris Double wrote:
> > On Tue, 08 Apr 2003 01:10, Felix Winkelmann wrote:
> >
> > > Not exactly a problem, but you have to make ABSOLUTELY SURE
> > > that the do_event() (in your example) is a `foreign-callback-lambda[*]'.
> > > That's essential! `foreign-lambda*' is wrong.
> >
> > Well, how about that. I changed my call of do_event to use:
> > (define wrapper-do-event
> >         (foreign-callback-lambda void "do_event" c_pointer))
> > When I call this things work perfectly. When I use the SWIG wrapper 
> > things fail. I guess the SWIG wrapper doesn't know that it's going to 
> > call a Scheme callback so it has no idea to do this.
> > I guess there's no problem after all!
> > I've now got multiple OpenGL windows running with background threads in 
> > the interpreter still operating at the same time, yay!
> > Many thanks for your help here Felix. I'm glad it was so easily sorted. 
> > While I could be disappointed about the time I spent debugging, at least 
> > I learnt a lot about the internals of the Chicken garbage collector!
>
> Yep, sorry for that misunderstanding. I will ask Jonah to
> add a note in the SWIG docs about callbacks.
>
>
> cheers,
> felix
>
>
>
>
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