Hello golang-dev@googlegroups.com, I'd like you to review this change to https://dvyukov%40google.com@code.google.com/p/go/
LGTM
*** Submitted as https://code.google.com/p/go/source/detail?r=db1736b03009 *** runtime: add atomic xchg64 It will be handy for network poller. R=golang-dev, rsc CC=golang-dev https://codereview.appspot.com/7429048