Re: garbage collection and NSConnection
Re: garbage collection and NSConnection
- Subject: Re: garbage collection and NSConnection
- From: Marcel Weiher <email@hidden>
- Date: Sun, 13 Jul 2008 09:29:42 -0700
On Jul 12, 2008, at 13:42 , Michael Ash wrote:
http://www.opensource.apple.com/darwinsource/projects/apsl/CF-476.10/CFRuntime.h
typedef struct __CFRuntimeBase {
uintptr_t _cfisa;
uint8_t _cfinfo[4];
#if __LP64__
uint32_t _rc;
#endif
} CFRuntimeBase;
I guess this isn't the right one, then.
If you look at the corresponding CFRuntime.c file, I think you'll find
that there is logic there for treating part of the _cfinfo as a retain
count (look for _CFRetain() )
To Gary, about 16-bit refcounts, I'd imagine that there's some logic
in there where if you hit 0xFFFF, it considers that to be a flag to
use an external refcount instead, at the cost of some speed.
Yep. Inline reference counts are an optimization, as such they need
to cater to the common case, not to the outliers (which still have to
be handled correctly, but don't need to be as fast).
Cheers,
Marcel
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