[libcxx-commits] [libcxx] [libcxx] Implementation of non lock-free atomic shared_ptr (PR #194215)

[William Tran-Viet via libcxx-commits]

smallp-o-p wrote:

IIRC, libc++ hasn't implemented `atomic<shared_ptr>>` because we haven't found a way to make it lock-free in a portable manner. @huixie90 probably knows more. 

https://github.com/llvm/llvm-project/pull/194215