[boost] Re: problem with shared_ptr

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2003-11-17 06:43:00

Or Peles wrote:
[...]
> Moving the shared_ptr assignment out of the concurrent part (e.g. instead of
> two assignments from concurrent threads a single assignment before the
> multithreaded part) gave me a tenfold increase in performance.
> 
> Is this reasonable?

Totally broken "boosted-lightweight" mutex stuff aside for a moment, 
you can't have concurrent assignments unless your have a smart pointer 
that provides "strong" thread safety (some people call it atomic_ptr). 
The last time I've looked at it, the boost::shared_ptr was providing 
"basic" thread-safety, not strong. Or, perhaps, you mean concurrent 
COPYING where your source is read-only-shared smart pointer instance?

Try

    http://www.pdimov.com/cpp/shared_count_x86_exp2.hpp

then.

regards,
alexander.