tree e1817e10d001621c00c384ad5e4fbaa697437cbf
parent e2050ae1aa9d7e8e6f425bbb7a3991fe612f3913
author Hans Boehm <hboehm@google.com> 1408055163 -0700
committer Hans Boehm <hboehm@google.com> 1408128156 -0700

Have stdatomic.h punt to C++ atomic when possible

This is an alternate, somewhat simpler, fix that makes it safe to
include both <atomic> and <stdatomic.h> from C++ code in either order.
It means that C code consistently uses one implementation of atomics
and C++ another.  We still have to make sure that those two
implementations interoperate correctly at runtime; in particular,
any flavor of atomic object needs to be represented exactly like the
underlying type, with the proper alignment constraint.

Bug:17007799
Change-Id: Iffcfc5220d8fa150f89dd083a121b24d23f268fc
(cherry picked from commit 019d3958118b7dc3ec8444ad2accca50c268b737)