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In fact you're entirely right; syncWait is not an atomic variable with any kind of memory ordering guarantee. So there's nothing that requires another core to agree to see the nullptr. (Although I expect this would work anywhere we'd test it) Thanks a lot. In any case the PR is updated. -- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/pull/1996#issuecomment-1505471727 You are receiving this because you are subscribed to this thread. Message ID: <[log in to unmask]> ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1