K 10 svn:author V 3 alc K 8 svn:date V 27 2017-12-26T20:33:45.565794Z K 7 svn:log V 339 MFC r326982 Document the semantics of atomic_thread_fence operations. Add atomic_load_ and atomic_store_, and explain why they exist. Define the synchronizes-with relationship and its effects. Reorder and revise some of the existing text. For example, more precisely describe when ordinary accesses are atomic. END