lidavidm commented on PR #41927:
URL: https://github.com/apache/arrow/pull/41927#issuecomment-2145113816

   That said, this doesn't seem like a guaranteed fix. 
https://stackoverflow.com/a/47117985/262727
   
   Mutating the shared_ptr while another thread is copying it is still 
thread-unsafe, just perhaps a little less likely to cause problems than before. 
I'd still want to at least document the API as thread-unsafe while perhaps 
allowing this PR to avoid some basic errors


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