On 02/01/19 20:08, Martin wrote:
If a local string var has a refcount of 1, then it can not be accessed by any other thread. Therefore it needs no lock for decreasing the ref.
You would need a full memory barrier before checking whether the reference count is one, otherwise it could have been increased to two by another thread on another core quite a while ago without that change being already visible on the current core. This would probably slow down things much more than any potential gain from not performing the atomic decrement.
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