[RFC PATCH 0/4] async: fix hangs on weakly-ordered architectures

[Paolo Bonzini]

Patch 4 fixes qemu-img and qemu-io hangs on weakly-ordered architectures.
Patch 1-3 are related docs fixes and improvements.

This is RFC because it relies on the iothread being locked during aio_poll
on the main AioContext.  If I add assertions for this however I see a
failure for test 267, so I am posting it as a preview before I debug that.
The doc patches can also go in independently of course.

Paolo

Paolo Bonzini (4):
  atomics: convert to reStructuredText
  atomics: update documentation for C11
  rcu: do not mention atomic_mb_read/set in documentation
  async: use explicit memory barriers

 docs/devel/atomics.rst | 385 +++++++++++++++++++++++++++++++++++++++
 docs/devel/atomics.txt | 403 -----------------------------------------
 docs/devel/index.rst   |   1 +
 docs/devel/rcu.txt     |   4 +-
 util/aio-posix.c       |   9 +-
 util/aio-win32.c       |   8 +-
 util/async.c           |  12 +-
 7 files changed, 413 insertions(+), 409 deletions(-)
 create mode 100644 docs/devel/atomics.rst
 delete mode 100644 docs/devel/atomics.txt

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2.18.2