Re: [boost] [interprocess] Boost.Thread developers willing to help on interprocess condition vars?

From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2007-09-30 13:33:11

Michael Marcin wrote:
> Phil Endecott wrote:
>> Ion Gazta?aga wrote:
>>> Since there is no atomic operations library in Boost I use my own atomic 
>>> operations (taken from apache):
>>>
>>> http://svn.boost.org/svn/boost/trunk/boost/interprocess/detail/atomic.hpp
>> 
>> It would be great to make this a publicly-visible library, rather than 
>> an implementation detail of interprocess.  That would avoid duplication 
>> of effort in e.g. shared_ptr.
>> 
>> Note that recent-ish versions of gcc have builtins for atomic 
>> operations on many platforms.
>
> Have you seen Matt Calabrese's work?
>
> http://lists.boost.org/Archives/boost/2007/07/124651.php

No I hadn't seen that; thanks for pointing it out.

While trying to find the 'asm', or whatever it uses, I must say that I 
have never seen quite so many levels of #includes!  I have spent a 
while looking but I can't find what's actually at the bottom of it all...

Based on my recent experience of adding ARM asm to shared_ptr, all that 
I would want from an Atomics library is something that wraps the gcc 
builtins when they exist, otherwise falling back to something like 
Ion's existing apache-based code - with some macros or other indication 
of whether the implementation for each function is asm or a more 
expensive emulation.

There may well be applications for a library like Matt's, but I would 
prefer it to be implemented on top of a more primitive, but accessible, layer.

Regards,

Phil.