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A comment on Dissecting objc_msgSend on ARM64. Parent comment

Re:Dissecting objc_msgSend on ARM64 by mikeash on Saturday July 01, 2017 @08:46PM (#14680074)
That is very cool. Can this approach be made thread safe while still being fast?
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Re:Dissecting objc_msgSend on ARM64 by dfox on Sunday July 02, 2017 @09:40AM (#14682440)
It is safe as long as everything that can get into the cache starts with the validity checking prologue and there is only one thread. Making this thread-safe is probably non-trivial.
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