Re: [boost] [Circular Buffer] Partial thread-safety

Subject: Re: [boost] [Circular Buffer] Partial thread-safety
From: Tim Blechmann (tim_at_[hidden])
Date: 2008-11-26 08:08:02

>>> Where is the magic? Can you point to some documentation or how to use
>>> it?
>>
>> It seems to make the assumption that volatile variable reads and writes
>> are atomic. This, among with careful organization of those operations,
>> allows safe concurrent access.
>>
> This sort of assumption looks wrong. volatile should only instruct the
> compiler not to optimize the variable (e.g. in a register).

the ringbuffer is known not to be smp-safe without memory barriers ... 

btw, i have a boost-style lockfree fifo class [1], with support for 
multiple concurrent producers/consumers ... i haven't found the time to 
make it ready for a submission, yet ...

cheers, tim

[1] http://tim.klingt.org/git?p=boost_lockfree.git

-- 
tim_at_[hidden]
http://tim.klingt.org
Art is either a complaint or do something else
  John Cage quoting Jasper Johns