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This will only be triggered in places where networking is involved, so were talking of the latencies in the order of tens (hundreds) of miliseconds. I don't think that couple hundred nanoseconds delay caused by a memory barrier will be much of an issue here. Alternatively you may move the PostMaster initialization to the static initializer, where it will be done on the app start up in a single-threaded context, but this may have other consequences for people who expect to do some things in a single-threaded mode before they do any data access. Your call. @esindril `__sync_lock_test_and_set` is your friend. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/pull/251#issuecomment-121767995 ######################################################################## 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