Date: Wed, 9 Jun 2004 20:37:03 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Julian Elischer <julian@elischer.org> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk> Subject: Re: cvs commit: src/sys/kern kern_proc.c Message-ID: <20040609183703.GX12007@darkness.comp.waw.pl> In-Reply-To: <Pine.BSF.4.21.0406091109100.57882-100000@InterJet.elischer.org> References: <57019.1086804305@critter.freebsd.dk> <Pine.BSF.4.21.0406091109100.57882-100000@InterJet.elischer.org>
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On Wed, Jun 09, 2004 at 11:23:48AM -0700, Julian Elischer wrote:
+> I do actually agree that a general purpose reference counting
+> API is very difficult to use in every situation and that there
+> are situations where you just HAVE to roll your own..
Maybe we can use macros to do this, something like:
#define REFCNT_MTX(foo, prefix, type, mtx_field, refcnt_field, destroy_func) \
foo void \
prefix ## _hold(type *obj) \
{ \
\
mtx_lock(&obj->mtx_field); \
obj->refcnt_field++; \
mtx_unlock(&obj->mtx_field); \
} \
\
foo void \
prefix ## _free(type *obj) \
{ \
int refcnt; \
\
mtx_lock(&obj->mtx_field); \
refcnt = --obj->refcnt_field; \
mtx_unlock(&obj->mtx_field); \
if (refcnt == 0) \
destroy_func(obj); \
}
And the same for REFCNT_ATOMIC() and REFCNT_SPIN()?
'foo' could be for example 'static' or 'static __inline'.
--
Pawel Jakub Dawidek http://www.FreeBSD.org
pjd@FreeBSD.org http://garage.freebsd.pl
FreeBSD committer Am I Evil? Yes, I Am!
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