> On Dec 25, 2015, at 9:02 PM, Philippe Hausler <phaus...@apple.com> wrote:
>
> > On Dec 22, 2015, at 1:08 PM, Joe Groff via swift-dev <swift-dev at
> > swift.org <https://lists.swift.org/mailman/listinfo/swift-dev>> wrote:
> >
> > It looks like the corelibs implementation of CoreFoundation references
> > swift_retainCount in order to implement CFGetRetainCount. Is getting the
> > retain count necessary to CF functionality, or can these functions be
> > removed?
>
> For some reason I was not on this list;
> So in response to your query about CF’s usage of CFGetRetainCount - I think
> we can safely forbid that function in the swift version since there is no
> safe way to use it (even CFMachPort is a bit dodgy for it’s usage).
>
> It might take some surgery but I can probably excise that fairly simply.
That'd be awesome. Thanks Philippe! For CFMachPort's usage, since it's checking
for a retainCount of 1, maybe we could use swift_isUniquelyReferenced* instead,
which we do need to reliably support for COW.
-Joe
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