Re: GC pros and cons
Re: GC pros and cons
- Subject: Re: GC pros and cons
- From: Bill Bumgarner <email@hidden>
- Date: Wed, 24 Jun 2009 13:00:51 -0500
On Jun 24, 2009, at 12:51 PM, Quincey Morris wrote:
In a nutshell, for folks like me who regularly use CFCreate …
CFRelease in loops, what are the benefits of GC?
If CFCreate/CFRelease is precisely what you want to do, there are no
benefits from GC, because the garbage collector isn't involved.
Similarly, if you regularly use alloc/init ... release in loops,
there are no benefits from using autorelease instead of release (in
a non-GC app, I mean).
However, if the lifetime of the object you CFCreate is not strictly
internal to the loop, then using (in a GC app) CFMakeCollectable
once instead of futzing with CFRelease in multiple paths of
execution might simplify your code greatly.
There are actually some performance downsides to using CFRetain/
CFRelease in Leopard that grow to a greater significance in Snow
Leopard. In Snow Leopard, this includes short lived objects like the
temporaries that may be CFCreate'd/CFRelease'd in a tight loop
(obviously, I can't disclose what those changes are -- if you are
curious, post a question to devforums.apple.com).
Specifically, you are effectively disabling the Collector's ability to
do collection work, including object reclamation and finalization,
concurrently with the execution of code that actually does work.
b.bum
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