[Boost-bugs] [Boost C++ Libraries] #9426: boost::atomic gcc-cas related specializations patch

Subject: [Boost-bugs] [Boost C++ Libraries] #9426: boost::atomic gcc-cas related specializations patch
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-11-23 01:13:01

#9426: boost::atomic gcc-cas related specializations patch
------------------------------------+--------------------------
 Reporter:  Piotr Kobzda <pikob@…>  |      Owner:  timblechmann
     Type:  Patches                 |     Status:  new
Milestone:  To Be Determined        |  Component:  atomic
  Version:  Boost 1.55.0            |   Severity:  Problem
 Keywords:                          |
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 Patch adds **''BOOST_ATOMIC_ALLOW_GCC_CAS''** library configuration option
 causing preferred use of atomic implementation specializations from ''gcc-
 cas.hpp'' instead of default ones.

 Patch includes also all changes necessary to fix compilation problems of
 ''gcc-cas.hpp'', and ''cas32strong.hpp''.

 Tested with gcc 4.5.3 (and few earlier versions) on ARM (manually forced)
 and on mipsel platforms.

 The gcc-cas atomic specializations (full memory barrier based) appeared to
 perform better on platforms where the default ones where used (pthread
 mutex based ones).

 However, the original author has disabled gcc-cas specialization with the
 following comment:

   ''/* currently does not work correctly */''

 which is a good reason for making use of it optional so far.

 Anyway, it would be great to know the details of the problems related the
 above comment, which could help in deciding if a new option can be used
 (and possibly help in solving of the issue).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9426>
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