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Re: I think I figured out how Apple did their toll-free bridging.
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From: |
David Chisnall |
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Subject: |
Re: I think I figured out how Apple did their toll-free bridging. |
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Date: |
Fri, 17 May 2013 17:55:36 -0400 |
On 17 May 2013, at 17:48, Chan Maxthon <address@hidden> wrote:
> All CoreFoundation objects places the field for retain count at the same
> offset as Cocoa objects do
Cocoa objects do not have an in-object retain count. This is why retain /
release on GNUstep are so much faster than on OS X / iOS. On iOS, they are all
stored in a C++ map table (in fact, the LLVM one). In OS X, there is an
initial hash that selects one of 8 map tables, for greater parallelism in the
retain / release operations.
David
-- Send from my Jacquard Loom