Hi @ljanyst - See PR #169. This is a no-op on x86 (and, I'm pretty sure, any sane architecture) and now valid C++11. That makes CMS happy. For what it's worth, many atomic use cases have little/no impact on x86 as that architecture has strong ordering guarantees. It's just the ones that involve multiple operations that get expensive (i.e., counter increments). Brian --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/166#issuecomment-63364218 ######################################################################## 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