Date: Thu, 19 Apr 2001 00:47:16 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Julian Elischer <julian@elischer.org> Cc: Terry Lambert <tlambert@primenet.com>, arch@FreeBSD.ORG Subject: Re: Found BAD BUG: squashed Message-ID: <200104190747.f3J7lG051820@earth.backplane.com> References: <200104182323.QAA22635@usr07.primenet.com> <3ADE60FB.E7B4AD95@elischer.org>
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:I suggest that we define a generic refcount type and implement
:basic kernel support for incrementing and decrementing it.
:
:These can be hand optimised and also be atomic
:there are some suggestions for this already...
:allowing the type to be a non-simple type
:gives the posibility of such debugging support being included.
:--
: __--_|\ Julian Elischer
I don't think this is a good idea. The best way to get a reference
on an object is to have an objet-specific referencing routine. e.g.
vget(), vrele(), vm_object_reference(), and so forth. Some of these
routines may well already have to obtain some sort of mutex to do their
stuff, and doing unnecessary bus-locked instructions on top of that
would be, well, unnecessary. I think it is best to leave the matter up
to the individual referencing/dereferencing procedures. Nobody
outside those specific routines should ever be manipulating a structure's
ref count anyway.
-Matt
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