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Well, this is illegal behavior in C++11 (as it is undefined); we'd like to really avoid illegal behavior... The write should already cause a cache flush on x86, right? If you really want minimal overhead, you can always use std::memory_order_relaxed (this has no guarantees about ordering or cache line contents other than writes are atomic) for loads/stores. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/166#issuecomment-63327845 ######################################################################## 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