Subject: Re: anybody familiar with these Mac ROM calls?
To: Rick C. Petty <pett0019@gold.tc.umn.edu>
From: Ken Nakata <kenn@eden.rutgers.edu>
List: port-mac68k
Date: 04/07/1996 11:05:08
> > _NewPtr(SysClear) and _DisposPtr are already supported by MRG. I
> > figured _HLock isn't a problem since nobody messes around anybody
> > else's memory under NetBSD.
>
> Yeah, well it may be important.
No, nobody moves anybody else's memory blocks under NetBSD, so
basically any block is always "locked".
> > _SInt{Install,Remove} wouldn't work
> > anyway, unless we make drastic changes in the interrupt handlers,
> > so I guess it's okay if they are just stubs doing nothing.
>
> Isn't there some sort of pseudo slot manager in BSD?
Nope. That's what I'm hoping to write.
> > It seems to me that _ResrvMem could be just a stub routine, too, since
^*emulated* (I left this out... sorry)
> > it doesn't seem to really allocate anything.
>
> But it moves around memory in preparation...
Under MacOS, okay. But under NetBSD, since nobody moves any allocated
memory blocks, do you need it? I think not.
> Basically, handles are pointers to pointers, but those first pointers are
> located in the master pointer records (see MoreMasters...) and contain
Yeah, because MacOS moves blocks around? Which isn't the case for
NetBSD...
> more information than just the pointer itself, like whether it's
> purged,locked, a resource, etc.
I don't think our *emulated* handles need to contain these bits of
information...
> I don't think BSD uses handles, but I've been wrong before...
A simple double pointer, maybe.
> What I think you should do is not worry about the Handle and just
> allocate a Ptr, since the block of memory looks to be fixed (locked) the
> whole time anyway. Then you won't have to mess with master pointers
> either. BTW: Whatever happened to malloc()?
malloc() is called to emulate NewHandle().
Thanks for the tips.
ken