> On Dec 14, 2015, at 9:47 AM, John McCall via swift-dev <swift-dev@swift.org> > wrote: > >> On Dec 12, 2015, at 7:04 PM, Chris Lattner <clatt...@apple.com> wrote: >> #3 sounds like a great approach to me. I agree with Kevin that if we keep >> the object husk approach that any use of a weak pointer that returns nil >> should drop any reference to a husk. > > Spin locks are, unfortunately, illegal on iOS, which does not guarantee > progress in the face of priority inversion.
There is a spinlock algorithm that does work (in practice if not in theory), but it requires a full word of storage instead of a single bit. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev
