On Tue, Nov 22, 2005 at 02:18:31PM -0800, Jason Thorpe wrote:
> 
> On Nov 22, 2005, at 1:53 PM, Bill Studenmund wrote:
> 
> >How do you think we should encode dependencies? I agree that the  
> >FreeBSD
> >way is uncentralized. However someone who studies the whole system can
> >tune it so that things get loaded in the right order (just pick the  
> >right
> >set of "FIRST", "SECOND", and so on). How would we do that w/o the  
> >master
> >list of values?
> 
> The init routine for each subsystem could easily enough call init  
> routines for the subsystems on which it depends.  Each of those init  
> routines would internally handle the "once" handling.
> 
> e.g.
> 
> static void
> foo_init0(void)
> {
> 	/* do stuff */
> }
> 
> void
> foo_init(void)
> {
> 	static ONCE_DECL(once_control);
> 
> 	RUN_ONCE(once_control, foo_init0);
> }
> 
> 
> 
> So, consider a network driver, which would call if_attach()...  
> if_attach() would in turn call if_init(), which would in turn call  
> if_init0() once.
> 
> For things like lists / tables / etc., we can change to using static  
> initializers for those.
> 

It could be done by kernel linker(loader) so he'll be responsible for module loading
and initialization, and so it wouldn't be needed to code dependiencies explicitly.

-Andrey