Re: [boost] [interprocess] atomic_write32 on GCC/x86/x68_64 lacks memory barrier

Subject: Re: [boost] [interprocess] atomic_write32 on GCC/x86/x68_64 lacks memory barrier
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2014-08-08 11:11:31

El 08/08/2014 14:28, Lars Hagström escribió:
> So I propose that atomic_write32 should be implemented using atomic_cas32.
> Or indeed that Boost.Atomic should be used instead, which is more work,
> obviously.

[CC-ing Andrey]

I'd like to use Boost.Atomic (assuming Boost.Atomic can be used in C++03 
mode). At least in all platforms where Boost.Atomic is available. The 
Boost.Interprocess atomics are broken and I don't have the skills to 
write correct code.

I'd like to use a header-only solution but I see that's not currently 
possible with Boost.Atomic. I'd only use 32 bit atomic operations and 
only in platforms where those are lock-free, as it's the case now wirh 
Interprocess (we can't fallback to std::mutex-es and that's perfectly 
acceptable).

Maybe it's a good task for Boost 1.57. Andrey, do you think porting to 
Boost.Atomic is a good idea? I don't know if Boost.Atomic supports all 
platforms Interprocess supports now (see 
www.boost.org/doc/libs/release/boost/interprocess/detail/atomic.hpp for 
details).

Best,

Ion