lockfree support in MSVC 2012

[Zouzou <internet@…>]

Hi,

MSVC 2012 has atomics; it therefore allows boost.lockfree to be used with it.

Using boost.atomic on MSVC is not an option because it falls back to interlocked functions (not lock-free).

Here is a simple patch for lockfree's atomic.hpp showing the necessary changes:

• don't define BOOST_LOCKFREE_NO_HDR_ATOMIC in order to use <atomic>, not <boost/atomic.hpp>.
• remove the (cplusplus < 201103L) check because cplusplus is defined to 199711 on MSVC 2012...

There is an additional change in freelist.hpp: include <boost/cstdint.hpp> (it was being included by <boost/atomic.hpp>).

With these changes lock-free lists seem to be working fine! :) (I verified that is_lock_free() does return true.)

Feel free to adjust the patch of course; this is just to show what is required to make boost.lockfree truly lock-free on MSVC 2012. I'm available for any further questions.

Thanks for adding atomic & lockfree. :) Zouzou

[Zouzou <internet@…>]

Patch

[timblechmann]

applied to trunk, thanks for the patch!