Re: [AD] Non C program accessing Allegro on OS X

[Jon Rafkind <workmin@xxxxxxxxxx>]

Elias Pschernig wrote:

> On Mon, 2005-10-24 at 23:48 -0400, Jon Rafkind wrote:
>  
>
> > Im using Allegro with bindings written in Scheme( MzScheme ) but am 
> > running into problems on OS X. This works fine on Linux, though. 
> > Basically how its set up is I load allegro.so( or in this case 
> > allegro.dylib ) and extract functions from it which I can then call just 
> > like I would from C. In this way the "magic main" in OS X isnt run and 
> > things dont seem to work right when this is the case. Im not very 
> > familiar with the OS X internals and KittyCat was telling me it wasnt 
> > really possible to run Allegro on OS X without the magic main but Im 
> > hoping this can be changed so it works the same on Linux.
> >
> > I did a bunch of debugging by adding printf's into the Allegro internals 
> > but couldnt really come up with anything since I think two or more 
> > threads are doing stuff once I activate allegro via install_allegro. One 
> > thing I did come up with is that if I dont have a main then __crt0_argv 
> > isnt set and in system.m line 489 will crash. This should read
> >
> > else if ( __crt0_argv != NULL ){
> >      do_uconvert(__crt0_argv[0], U_ASCII, output, U_CURRENT, size);
> >   }
> >
> > instead.
> >
> > Any OS X have any insight into this problem?
> >
> >    
>
> Basically, you must give control of the main thread to Allegro. You can
> see what Allegro does at startup in src/macosx/main.m. The main()
> function in there is the main function of any standalone Allegro
> program, the main() in your code gets basically renamed to something
> else with END_OF_MAIN.
>
>  
While hacking the crap out of the OS X code I discovered that a Bus 
error would occur if rest(1) was called while the usleep( 100000 / 
refresh_rate ) happened. Im about to goto sleep and dont have to to 
investigate it now but does it sound like that might be a race condition?

Anyway, I think I may have solved my previous question but I will have 
to hack a bit more to know for sure. I will let you know if it works as 
Im sure someone is interested in this.