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You already hold explicit mutex when you do mutations, so `memory_order_relaxed` would be enough, you only need atomicity. This will likely just result with something like `xchg [RAX], RCX` on x86_64, no memory fence, same as `__sync_fetch*` would. If you solve the problem only for C++11, you leave out most clients without a fix. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/pull/265#issuecomment-121925424 ######################################################################## 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